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Turtle

October 14, 2023

For other uses, see Turtle (disambiguation).
"Chelonian" redirects here. For other uses, see Chelonian (disambiguation).

Turtles are an order of reptiles known as Testudines, characterized by a special shell developed mainly from their ribs. Modern turtles are divided into two major groups, the Pleurodira (side necked turtles) and Cryptodira (hidden necked turtles), which differ in the way the head retracts. There are 360 living and recently extinct species of turtles, including land-dwelling tortoises and freshwater terrapins. They are found on most continents, some islands and, in the case of sea turtles, much of the ocean. Like other amniotes (reptiles, birds, and mammals) they breathe air and do not lay eggs underwater, although many species live in or around water.

Turtles
Temporal range: Late Jurassic – Present
Turtles from different families; clockwise from top-left: Red-bellied short-necked turtle, Indian flapshell turtle, Hawksbill sea turtle, and Galápagos tortoise
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Pantestudines
Clade: Testudinata
Clade: Perichelydia
Order: Testudines
Batsch, 1788[1]
Subgroups
Diversity
14 living families
Blue: sea turtles, black: land turtles
Synonyms[2]
  • Chelonii Latreille 1800
  • Chelonia Ross and Macartney 1802

Turtle shells are made mostly of bone; the upper part is the domed carapace, while the underside is the flatter plastron or belly-plate. Its outer surface is covered in scales made of keratin, the material of hair, horns, and claws. The carapace bones develop from ribs that grow sideways and develop into broad flat plates that join up to cover the body. Turtles are ectotherms or "cold-blooded", meaning that their internal temperature varies with their direct environment. They are generally opportunistic omnivores and mainly feed on plants and animals with limited movements. Many turtles migrate short distances seasonally. Sea turtles are the only reptiles that migrate long distances to lay their eggs on a favored beach.

Turtles have appeared in myths and folktales around the world. Some terrestrial and freshwater species are widely kept as pets. Turtles have been hunted for their meat, for use in traditional medicine, and for their shells. Sea turtles are often killed accidentally as bycatch in fishing nets. Turtle habitats around the world are being destroyed. As a result of these pressures, many species are extinct or threatened with extinction.

Naming and etymology

The word turtle is borrowed from the French word tortue or tortre 'turtle, tortoise'.[3] It is a common name and may be used without knowledge of taxonomic distinctions. In North America, it may denote the order as a whole. In Britain, the name is used for sea turtles as opposed to freshwater terrapins and land-dwelling tortoises. In Australia, which lacks true tortoises (family Testudinidae), non-marine turtles were traditionally called tortoises, but more recently turtle has been used for the entire group.[4]

The name of the order, Testudines (/tɛˈstjuːdɪniːz/ teh-STEW-din-eez), is based on the Latin word testudo 'tortoise';[5] and was coined by German naturalist August Batsch in 1788.[1] The order has also been historically known as Chelonii (Latreille 1800) and Chelonia (Ross and Macartney 1802),[2] which are based on the Ancient Greek word χελώνη (chelone) 'tortoise'.[6][7] Testudines is the official order name due to the principle of priority.[2] The term chelonian is used as a formal name for members of the group.[1][8]

Anatomy and physiology

Size

The largest living species of turtle (and fourth-largest reptile) is the leatherback turtle, which can reach over 2.7 m (8 ft 10 in) in length and weigh over 500 kg (1,100 lb).[9] The largest known turtle was Archelon ischyros, a Late Cretaceous sea turtle up to 4.5 m (15 ft) long, 5.25 m (17 ft) wide between the tips of the front flippers, and estimated to have weighed over 2,200 kg (4,900 lb).[10] The smallest living turtle is Chersobius signatus of South Africa, measuring no more than 10 cm (3.9 in) in length[11] and weighing 172 g (6.1 oz).[12]

Shell

Main article: Turtle shell
 
Sagittal section of a tortoise skeleton

The shell of a turtle is unique among vertebrates and serves to protect the animal and provide shelter from the elements.[13][14][15] It is primarily made of 50–60 bones and consists of two parts: the domed, dorsal (back) carapace and the flatter, ventral (belly) plastron. They are connected by lateral (side) extensions of the plastron.[13][16]

The carapace is fused with the vertebrae and ribs while the plastron is formed from bones of the shoulder girdle, sternum, and gastralia (abdominal ribs).[13] During development, the ribs grow sideways into a carapacial ridge, unique to turtles, entering the dermis (inner skin) of the back to support the carapace. The development is signaled locally by proteins known as fibroblast growth factors that include FGF10.[17] The shoulder girdle in turtles is made up of two bones, the scapula and the coracoid.[18] Both the shoulder and pelvic girdles of turtles are located within the shell and hence are effectively within the rib cage. The trunk ribs grow over the shoulder girdle during development.[19]

 
Development of the shell. The ribs are growing sideways into the carapacial ridge, seen here as a bud, to support the carapace.[17]

The shell is covered in epidermal (outer skin) scales known as scutes that are made of keratin, the same substance that makes up hair and fingernails. Typically, a turtle has 38 scutes on the carapace and 16 on the plastron, giving them 54 in total. Carapace scutes are divided into "marginals" around the margin and "vertebrals" over the vertebral column, though the scute that overlays the neck is called the "cervical". "Pleurals" are present between the marginals and vertebrals.[20] Plastron scutes include gulars (throat), humerals, pectorals, abdominals, and anals. Side-necked turtles additionally have "intergular" scutes between the gulars.[16][21] Turtle scutes are usually structured like mosaic tiles, but some species, like the hawksbill sea turtle, have overlapping scutes on the carapace.[16]

The shapes of turtle shells vary with the adaptations of the individual species, and sometimes with sex. Land-dwelling turtles are more dome-shaped, which appears to make them more resistant to being crushed by large animals. Aquatic turtles have flatter, smoother shells that allow them to cut through the water. Sea turtles in particular have streamlined shells that reduce drag and increase stability in the open ocean. Some turtle species have pointy or spiked shells that provide extra protection from predators and camouflage against the leafy ground. The lumps of a tortoise shell can tilt its body when it gets flipped over, allowing it to flip back. In male tortoises, the tip of the plastron is thickened and used for butting and ramming during combat.[22]

Shells vary in flexibility. Some species, such as box turtles, lack the lateral extensions and instead have the carapace bones fully fused or ankylosed together. Several species have hinges on their shells, usually on the plastron, which allow them to expand and contract. Softshell turtles have rubbery edges, due to the loss of bones. The leatherback turtle has hardly any bones in its shell, but has thick connective tissue and an outer layer of leathery skin.[23]

Head and neck

 
Head and neck of a European pond turtle

The turtle's skull is unique among living amniotes (which includes reptiles, birds and mammals), it is solid and rigid with no openings for muscle attachment (temporal fenestrae).[24][25] Muscles instead attach to recesses in the back of the skull. Turtle skulls vary in shape, from the long and narrow skulls of softshells to the broad and flattened skull of the mata mata.[25] Some turtle species have developed large and thick heads, allowing for greater muscle mass and stronger bites.[26]

Turtles that are carnivorous or durophagous (eating hard-shelled animals) have the most powerful bites. For example, the durophagous Mesoclemmys nasuta has a bite force of 432 lbf (1,920 N). Species that are insectivorous, piscivorous (fish-eating), or omnivorous have lower bite forces.[27] Living turtles lack teeth but have beaks made of keratin sheaths along the edges of the jaws.[28][13] These sheaths may have sharp edges for cutting meat, serrations for clipping plants, or broad plates for breaking mollusks.[29]

The necks of turtles are highly flexible, possibly to compensate for their rigid shells. Some species, like sea turtles, have short necks while others, such as snake-necked turtles, have long ones. Despite this, all turtle species have eight neck vertebrae, a consistency not found in other reptiles but similar to mammals.[30] Some snake-necked turtles have both long necks and large heads, limiting their ability to lift them when not in water.[26] Some turtles have folded structures in the larynx or glottis that vibrate to produce sound. Other species have elastin-rich vocal cords.[31][32]

Limbs and locomotion

Due to their heavy shells, turtles are slow-moving on land. A desert tortoise moves at only 0.22–0.48 km/h (0.14–0.30 mph). By contrast, sea turtles can swim at 30 km/h (19 mph).[13] The limbs of turtles are adapted for various means of locomotion and habits and most have five toes. Tortoises are specialized for terrestrial environments and have column-like legs with elephant-like feet and short toes. The gopher tortoise has flattened front limbs for digging in the substrate. Freshwater turtles have more flexible legs and longer toes with webbing, giving them thrust in the water. Some of these species, such as snapping turtles and mud turtles, mainly walk along the water bottom, as they would on land. Others, such as terrapins, swim by paddling with all four limbs, switching between the opposing front and hind limbs, which keeps their direction stable.[13][33]

 
Sea turtles have streamlined shells and limbs adapted for fast and efficient swimming.[34]

Sea turtles and the pig-nosed turtle are the most specialized for swimming. Their front limbs have evolved into flippers while the shorter hind limbs are shaped more like rudders. The front limbs provide most of the thrust for swimming, while the hind limbs serve as stabilizers.[13][35] Sea turtles such as the green sea turtle rotate the front limb flippers like a bird's wings to generate a propulsive force on both the upstroke and on the downstroke. This is in contrast to similar-sized freshwater turtles (measurements having been made on young animals in each case) such as the Caspian turtle, which uses the front limbs like the oars of a rowing boat, creating substantial negative thrust on the recovery stroke in each cycle. In addition, the streamlining of the marine turtles reduces drag. As a result, marine turtles produce a propulsive force twice as large, and swim six times as fast, as freshwater turtles. The swimming efficiency of young marine turtles is similar to that of fast-swimming fish of open water, like mackerel.[34]

Compared to other reptiles, turtles tend to have reduced tails, but these vary in both length and thickness among species and between sexes. Snapping turtles and the big-headed turtle have longer tails; the latter uses it for balance while climbing. The cloaca is found underneath and at the base, and the tail itself houses the reproductive organs. Hence, males have longer tails to contain the penis. In sea turtles, the tail is longer and more prehensile in males, who use it to grasp mates. Several turtle species have spines on their tails.[36][24]

Senses

 
The red-eared slider has an exceptional seven types of color-detecting cells in its eyes.[37]

Turtles make use of vision to find food and mates, avoid predators, and orient themselves. The retina's light-sensitive cells include both rods for vision in low light, and cones with three different photopigments for bright light, where they have full-color vision. There is possibly a fourth type of cone that detects ultraviolet, as hatchling sea turtles respond experimentally to ultraviolet light, but it is unknown if they can distinguish this from longer wavelengths. A freshwater turtle, the red-eared slider, has an exceptional seven types of cone cell.[37][38][39]

Sea turtles orient themselves on land by night, using visual features detected in dim light. They can use their eyes in clear surface water, muddy coasts, the darkness of the deep ocean, and also above water. Unlike in terrestrial turtles, the cornea, the curved surface that lets light into the eye, does not help to focus light on the retina, so focusing underwater is handled entirely by the lens, behind the cornea. The cone cells contain oil droplets placed to shift perception toward the red part of the spectrum, improving color discrimination. Visual acuity, studied in hatchlings, is highest in a horizontal band with retinal cells packed about twice as densely as elsewhere. This gives the best vision along the visual horizon. Sea turtles do not appear to use polarized light for orientation as many other animals do. The deep-diving leatherback turtle lacks specific adaptations to low light, such as large eyes, large lenses, or a reflective tapetum. It may rely on seeing the bioluminescence of prey when hunting in deep water.[37]

Turtles have no ear openings; the eardrum is covered with scales and encircled by a bony otic capsule, which is absent in other reptiles.[30] Their hearing thresholds are high in comparison to other reptiles, reaching up to 500 Hz in air, but underwater they are more attuned to lower frequencies.[40] The loggerhead sea turtle has been shown experimentally to respond to low sounds, with maximal sensitivity between 100 and 400 Hz.[41]

Turtles have olfactory (smell) and vomeronasal receptors along the nasal cavity, the latter of which are used to detect chemical signals.[42] Experiments on green sea turtles showed they could learn to respond to a selection of different odorant chemicals such as triethylamine and cinnamaldehyde, which were detected by olfaction in the nose. Such signals could be used in navigation.[43]

Breathing

 
A submerged Indian softshell turtle nose-breathing at river surface

The rigid shell of turtles is not capable of expanding and making room for the lungs, as in other amniotes, so they have had to evolve special adaptations for respiration.[44][45][46] The lungs of turtles are attached directly to the carapace above while below, connective tissue attaches them to the organs.[47] They have multiple lateral (side) and medial (middle) chambers (the numbers of which vary between species) and one terminal (end) chamber.[48]

The lungs are ventilated using specific groups of abdominal muscles attached to the organs that pull and push on them.[44] Specifically, it is the turtle's large liver that compresses the lungs. Underneath the lungs, in the coelomic cavity, the liver is connected to the right lung by the root, and the stomach is directly attached to the left lung, and to the liver by a mesentery. When the liver is pulled down, inhalation begins.[45] Supporting the lungs is a wall or septum, which is thought to prevent them from collapsing.[49] During exhalation, the contraction of the transversus abdominis muscle propels the organs into the lungs and expels air. Conversely, during inhalation, the relaxing and flattening of the oblique abdominis muscle pulls the transversus back down, allowing air back into the lungs.[45]

Although many turtles spend large amounts of their lives underwater, all turtles breathe air and must surface at regular intervals to refill their lungs. Depending on the species, immersion periods vary between a minute and an hour.[50] Some species can respire through the cloaca, which contains large sacs that are lined with many finger-like projections that take up dissolved oxygen from the water.[51]

Circulation

 
Snapping turtle emerging from period of brumation, in which it buried itself in mud. Turtles have multiple circulatory and physiological adaptations to enable them to go long periods without breathing.[52]

Turtles share the linked circulatory and pulmonary (lung) systems of vertebrates, where the three-chambered heart pumps deoxygenated blood through the lungs and then pumps the returned oxygenated blood through the body's tissues. The cardiopulmonary system has both structural and physiological adaptations that distinguish it from other vertebrates. Turtles have a large lung volume and can move blood through non-pulmonary blood vessels, including some within the heart, to avoid the lungs while they are not breathing. They can hold their breath for much longer periods than other reptiles and they can tolerate the resulting low oxygen levels. They can moderate the increase in acidity during anaerobic (non-oxygen-based) respiration by chemical buffering and they can lie dormant for months, in aestivation or brumation.[52]

The heart has two atria but only one ventricle. The ventricle is subdivided into three chambers. A muscular ridge enables a complex pattern of blood flow so that the blood can be directed either to the lungs via the pulmonary artery, or to the body via the aorta. The ability to separate the two outflows varies between species. The leatherback has a powerful muscular ridge enabling almost complete separation of the outflows, supporting its actively swimming lifestyle. The ridge is less well developed in freshwater turtles like the sliders (Trachemys).[52]

Turtles are capable of enduring periods of anaerobic respiration longer than many other vertebrates. This process breaks down sugars incompletely to lactic acid, rather than all the way to carbon dioxide and water as in aerobic (oxygen-based) respiration.[52] They make use of the shell as a source of additional buffering agents for combating increased acidity, and as a sink for lactic acid.[53]

Osmoregulation

In sea turtles, the bladder is one unit and in most freshwater turtles, it is double-lobed.[54] Sea turtle bladders are connected to two small accessory bladders, located at the sides to the neck of the urinary bladder and above the pubis.[55] Arid-living tortoises have bladders that serve as reserves of water, storing up to 20% of their body weight in fluids. The fluids are normally low in solutes, but higher during droughts when the reptile gains potassium salts from its plant diet. The bladder stores these salts until the tortoise finds fresh drinking water.[56] To regulate the amount of salt in their bodies, sea turtles and the brackish-living diamondback terrapin secrete excess salt in a thick sticky substance from their tear glands. Because of this, sea turtles may appear to be "crying" when on land.[57]

Thermoregulation

 
Smaller pond turtles, like these northern red-bellied cooters, regulate their temperature by basking in the sun.

Turtles, like other reptiles, have a limited ability to regulate their body temperature. This ability varies between species, and with body size. Small pond turtles regulate their temperature by crawling out of the water and basking in the sun, while small terrestrial turtles move between sunny and shady places to adjust their temperature. Large species, both terrestrial and marine, have sufficient mass to give them substantial thermal inertia, meaning that they heat up or cool down over many hours. The Aldabra giant tortoise weighs up to some 60 kilograms (130 lb) and is able to allow its temperature to rise to some 33 °C (91 °F) on a hot day, and to fall naturally to around 29 °C (84 °F) by night. Some giant tortoises seek out shade to avoid overheating on sunny days. On Grand Terre Island, food is scarce inland, shade is scarce near the coast, and the tortoises compete for space under the few trees on hot days. Large males may push smaller females out of the shade, and some then overheat and die.[58]

Adult sea turtles, too, have large enough bodies that they can to some extent control their temperature. The largest turtle, the leatherback, can swim in the waters off Nova Scotia, which may be as cold as 8 °C (46 °F), while their body temperature has been measured at up to 12 °C (22 °F) warmer than the surrounding water. To help keep their temperature up, they have a system of countercurrent heat exchange in the blood vessels between their body core and the skin of their flippers. The vessels supplying the head are insulated by fat around the neck.[58]

Behavior

Diet and feeding

 
A green sea turtle grazing on seagrass

Most turtle species are opportunistic omnivores; land-dwelling species are more herbivorous and aquatic ones more carnivorous.[26] Generally lacking speed and agility, most turtles feed either on plant material or on animals with limited movements like mollusks, worms, and insect larvae.[13] Some species, such as the African helmeted turtle and snapping turtles, eat fish, amphibians, reptiles (including other turtles), birds, and mammals. They may take them by ambush but also scavenge.[59] The alligator snapping turtle has a worm-like appendage on its tongue that it uses to lure fish into its mouth. Tortoises are the most herbivorous group, consuming grasses, leaves, and fruits.[60] Many turtle species, including tortoises, supplement their diet with eggshells, animal bones, hair, and droppings for extra nutrients.[61]

Turtles generally eat their food in a straightforward way, though some species have special feeding techniques.[13] The yellow-spotted river turtle and the painted turtle may filter feed by skimming the water surface with their mouth and throat open to collect particles of food. When the mouth closes, the throat constricts and water is pushed out through the nostrils and the gap in between the jaws.[62] Some species employ a "gape-and-suck method" where the turtle opens its jaws and expands its throat widely, sucking the prey in.[13][63][64]

The diet of an individual within a species may change with age, sex, and season, and may also differ between populations. In many species, juveniles are generally carnivorous but become more herbivorous as adults.[13][65] With Barbour's map turtle, the larger female mainly eats mollusks while the male usually eats arthropods.[13] Blanding's turtle may feed mainly on snails or crayfish depending on the population. The European pond turtle has been recorded as being mostly carnivorous much of the year but switching to water lilies during the summer.[66] Some species have developed specialized diets such as the hawksbill, which eats sponges, the leatherback, which feeds on jellyfish, and the Mekong snail-eating turtle.[26][13]

Communication and intelligence

 
The oblong turtle has a sizable vocal repertoire.[67]
See also: Animal cognition

While popularly thought of as mute, turtles make various sounds to communicate.[68][69] One study which recorded 53 species found that all of them vocalized.[70] Tortoises may bellow when courting and mating.[69][30] Various species of both freshwater and sea turtles emit short, low-frequency calls from the time they are in the egg to when they are adults. These vocalizations may serve to create group cohesion when migrating.[69] The oblong turtle has a particularly large vocal range; producing sounds described as clacks, clicks, squawks, hoots, various kinds of chirps, wails, hooos, grunts, growls, blow bursts, howls, and drum rolls.[67]

Play behavior has been documented in some turtle species.[71] In the laboratory, Florida red-bellied cooters can learn novel tasks and have demonstrated a long-term memory of at least 7.5 months.[72] Similarly, giant tortoises can learn and remember tasks, and master lessons much faster when trained in groups.[73] Tortoises appear to be able to retain operant conditioning nine years after their initial training.[74] Studies have shown that turtles can navigate the environment using landmarks and a map-like system resulting in accurate direct routes towards a goal.[75] Navigation in turtles have been correlated to high cognition function in the medial cortex region of the brain.[75][76]

 
Crested caracara eating a turtle

Defense

See also: Anti-predator adaptation

When sensing danger, a turtle may flee, freeze or withdraw into its shell. Freshwater turtles flee into the water, though the Sonora mud turtle may take refuge on land as the shallow temporary ponds they inhabit make them vulnerable.[77] When startled, a softshell turtle may dive underwater and bury itself under the sea floor.[78] If a predator persists, the turtle may bite or discharge from its cloaca. Several species produce foul-smelling chemicals from musk glands. Other tactics include threat displays and Bell's hinge-back tortoise can play dead. When attacked, big-headed turtle hatchlings squeal, possibly startling the predator.[79]

Migration

Further information: Sea turtle migration
 
An olive ridley sea turtle nesting on Escobilla Beach, Oaxaca, Mexico. Female sea turtles migrate long distances to nest on favored beaches.

Turtles are the only reptiles that migrate long distances, more specifically the marine species that can travel up to thousands of kilometers. Some non-marine turtles, such as the species of Geochelone (terrestrial), Chelydra (freshwater), and Malaclemys (estuarine), migrate seasonally over much shorter distances, up to around 27 km (17 mi), to lay eggs. Such short migrations are comparable to those of some lizards, snakes, and crocodilians.[80] Sea turtles nest in a specific area, such as a beach, leaving the eggs to hatch unattended. The young turtles leave that area, migrating long distances in the years or decades in which they grow to maturity, and then return seemingly to the same area every few years to mate and lay eggs, though the precision varies between species and populations. This "natal homing" has appeared remarkable to biologists, though there is now plentiful evidence for it, including from genetics.[81]

How sea turtles navigate to their breeding beaches remains unknown. One possibility is imprinting as in salmon, where the young learn the chemical signature, effectively the scent, of their home waters before leaving, and remember that when the time comes for them to return as adults. Another possible cue is the orientation of the earth's magnetic field at the natal beach. There is experimental evidence that turtles have an effective magnetic sense, and that they use this in navigation. Proof that homing occurs is derived from genetic analysis of populations of loggerheads, hawksbills, leatherbacks, and olive ridleys by nesting place. For each of these species, the populations in different places have their own mitochondrial DNA genetic signatures that persist over the years. This shows that the populations are distinct and that homing must be occurring reliably.[81]

Reproduction and life cycle

 
Desert tortoises fighting

Turtles have a wide variety of mating behaviors but do not form pair-bonds or social groups.[82] In green sea turtles, females generally outnumber males.[83] In terrestrial species, males are often larger than females and fighting between males establishes a dominance hierarchy for access to mates. For most semi-aquatic and bottom-walking aquatic species, combat occurs less often. Males of these species instead may use their size advantage to mate forcibly. In fully aquatic species, males are often smaller than females and rely on courtship displays to gain mating access to females.[84]

Courtship and mounting

Courtship varies between species, and with habitat. It is often complex in aquatic species, both marine and freshwater, but simpler in the semi-aquatic mud turtles and snapping turtles. A male tortoise bobs his head, then subdues the female by biting and butting her before mounting.[13] The male scorpion mud turtle approaches the female from the rear, and often resorts to aggressive methods such as biting the female's tail or hind limbs, followed by a mounting.[85]

Female choice is important in some species, and female green sea turtles are not always receptive. As such, they have evolved behaviors to avoid the male's attempts at copulation, such as swimming away, confronting the male followed by biting or taking up a refusal position with her body vertical, her limbs widely outspread, and her plastron facing the male. If the water is too shallow for the refusal position, the females resort to beaching themselves, as the males do not follow them ashore.[83]

 
Mounting behavior in the three-toed box turtle

All turtles fertilize internally; mounting and copulation can be difficult. In many species, males have a concave plastron that interlocks with the female's carapace. In species like the Russian tortoise, the male has a lighter shell and longer legs. The high, rounded shape of box turtles are particular obstacles for mounting. The male eastern box turtle leans backward and hooks onto the back of the female's plastron.[86] Aquatic turtles mount in water,[87][88] and female sea turtles support the mounting male while swimming and diving.[89] During copulation, the male turtle aligns his tail with the female's so he can insert his penis into her cloaca.[90] Some female turtles can store sperm from multiple males and their egg clutches can have multiple sires.[91][82]

Eggs and hatchlings

 
A female common snapping turtle depositing her eggs in a hole she dug

Turtles, including sea turtles, lay their eggs on land, although some lay eggs near water that rises and falls in level, submerging the eggs. While most species build nests and lay eggs where they forage, some travel miles. The common snapping turtle walks 5 km (3 mi) on land, while sea turtles travel even further; the leatherback swims some 12,000 km (7,500 mi) to its nesting beaches.[13][88] Most turtles create a nest for their eggs. Females usually dig a flask-like chamber in the substrate. Other species lay their eggs in vegetation or crevices.[92] Females choose nesting locations based on environmental factors such as temperature and humidity, which are important for developing embryos.[88] Depending on the species, the number of eggs laid varies from one to over 100. Larger females can lay eggs that are greater in number or bigger in size. Compared to freshwater turtles, tortoises deposit fewer but larger eggs. Females can lay multiple clutches throughout a season, particularly in species that experience unpredictable monsoons.[93]

 
Marginated tortoise emerges from its egg

Most mother turtles do no more in the way of parental care than covering their eggs and immediately leaving, though some species guard their nests for days or weeks.[94] Eggs vary between rounded, oval, elongated, and between hard- and soft-shelled.[95] Most species have their sex determined by temperature. In some species, higher temperatures produce females and lower ones produce males, while in others, milder temperatures produce males and both hot and cold extremes produce females.[13] There is experimental evidence that the embryos of Mauremys reevesii can move around inside their eggs to select the best temperature for development, thus influencing their sexual destiny.[96] In other species, sex is determined genetically. The length of incubation for turtle eggs varies from two to three months for temperate species, and four months to over a year for tropical species.[13] Species that live in warm temperate climates can delay their development.[97]

Hatching young turtles break out of the shell using an egg tooth, a sharp projection that exists temporarily on their upper beak.[13][98] Hatchlings dig themselves out of the nest and find safety in vegetation or water. Some species stay in the nest for longer, be it for overwintering or to wait for the rain to loosen the soil for them to dig out.[13] Young turtles are highly vulnerable to predators, both in the egg and as hatchlings. Mortality is high during this period but significantly decreases when they reach adulthood. Most species grow quickly during their early years and slow down when they are mature.[99]

Lifespan

Turtles can live long lives. The oldest living turtle and land animal is said to be a Seychelles giant tortoise named Jonathan, who turned 187 in 2019.[100] A Galápagos tortoise named Harriet was collected by Charles Darwin in 1835; it died in 2006, having lived for at least 176 years. Most wild turtles do not reach that age. Turtles keep growing new scutes under the previous scutes every year, allowing researchers to estimate how long they have lived.[101] They also age slowly.[102] The survival rate for adult turtles can reach 99% per year.[13]

Systematics and evolution

Further information: Turtle classification and List of Testudines families

Fossil history

 
Diagram of the origins of the turtle body plan through the Triassic: isolated bony plates evolved to form a complete shell, in a sequence involving Pappochelys, Eorhynchochelys, Odontochelys, and Proganochelys.[19]

Zoologists have sought to explain the evolutionary origin of the turtles, and in particular of their unique shells. In 1914, Jan Versluys proposed that bony plates in the dermis, called osteoderms, fused to the ribs beneath them, later called the "Polka Dot Ancestor" by Olivier Rieppel.[19][103] The theory accounted for the evolution of fossil pareiasaurs from Bradysaurus to Anthodon, but not for how the ribs could have become attached to the bony dermal plates.[19]

More recent discoveries have painted a different scenario for the evolution of the turtle's shell. The stem-turtles Eunotosaurus of the Middle Permian, Pappochelys of the Middle Triassic, and Eorhynchochelys of the Late Triassic lacked carapaces and plastrons but had shortened torsos, expanded ribs, and lengthened dorsal vertebrae. Also in the Late Triassic, Odontochelys had a partial shell consisting of a complete bony plastron and an incomplete carapace. The development of a shell reached completion with the Late Triassic Proganochelys, with its fully developed carapace and plastron.[19][104] Adaptations that lead to the evolution of the shell may have originally been for digging and a fossorial lifestyle.[104]

The oldest known members of the Pleurodira lineage are the Platychelyidae, from the Late Jurassic.[105] The oldest known unambiguous cryptodire is Sinaspideretes, a close relative of softshell turtles, from the Late Jurassic of China.[106] During the Late Cretaceous and Cenozoic, members of the pleurodire families Bothremydidae and Podocnemididae became widely distributed in the Northern Hemisphere due to their coastal habits.[107][108] The oldest known soft-shelled turtles and sea turtles appeared during the Early Cretaceous.[109][110] Tortoises originated in Asia during the Eocene.[111] A late surviving group of stem-turtles, the Meiolaniidae, survived in Australasia into the Pleistocene and Holocene.[112]

External relationships

The turtles' exact ancestry has been disputed. It was believed they were the only surviving branch of the ancient evolutionary grade Anapsida, which includes groups such as procolophonids and pareiasaurs. All anapsid skulls lack a temporal opening while all other living amniotes have temporal openings.[113] It was later suggested that the anapsid-like turtle skulls may be due to backward evolution rather than to anapsid descent.[114] Fossil evidence has shown that early stem-turtles possessed small temporal openings.[104]

Some early morphological phylogenetic studies have placed turtles closer to Lepidosauria (tuataras, lizards, and snakes) than to Archosauria (crocodilians and birds).[113] By contrast, several molecular studies place turtles either within Archosauria,[115] or, more commonly, as a sister group to extant archosaurs,[114][116][117][118] though an analysis conducted by Tyler Lyson and colleagues (2012) recovered turtles as the sister group of lepidosaurs instead.[119] Ylenia Chiari and colleagues (2012) analyzed 248 nuclear genes from 16 vertebrates and suggested that turtles share a more recent common ancestor with birds and crocodilians. The date of separation of turtles and birds and crocodilians was estimated to be 255 million years ago during the Permian.[120] Through genomic-scale phylogenetic study of ultra-conserved elements (UCEs) to clarify the placement of turtles within reptiles, Nicholas Crawford and colleagues (2012) similarly found that turtles are closer to birds and crocodilians.[121]

Using the draft (unfinished) genome sequences of the green sea turtle and the Chinese softshell turtle, Zhuo Wang and colleagues (2013) concluded that turtles are likely a sister group of crocodilians and birds.[122] The external phylogeny of the turtles is shown in the cladogram below.[121]

Diapsida
Archosauromorpha

Crocodilia (crocodiles, alligators)  

Aves (birds)  

Testudines  

Lepidosauromorpha

Squamata (lizards, snakes)  

Internal relationships

Modern turtles and their extinct relatives with a complete shell are classified within the clade Testudinata.[123] The most recent common ancestor of living turtles, corresponding to the split between Pleurodira (side-necked species) and Cryptodira (hidden necked species), is estimated to have occurred around 210 million years ago during the Late Triassic.[124] Robert Thompson and colleagues (2021) comment that living turtles have low diversity, relative to how long they existed. Diversity has been stable, according to their analysis, except for a single rapid increase around the Eocene-Oligocene boundary some 30 million years ago, and a large regional extinction at roughly the same time. They suggest that global climate change caused both events, as the cooling and drying caused the land to become arid and turtles to become extinct there, while new continental margins opened up by the climate change provided habitats for other species to evolve.[125]

The cladogram, from Nicholas Crawford and colleagues 2015, shows the internal phylogeny of the Testudines down to the level of families.[126][127] The analysis by Thompson and colleagues in 2021 supports the same structure down to the family level.[125]

Testudines
Pleurodira
 (Side‑necked turtles) 
Cryptodira
Testudinoidea
Testudinidae

 

(Tortoises)
Geoemydidae

 

Platysternidae

 

Emydidae

 

(Terrapins)
Chelydroidea

Chelydridae  

(Snapping turtles)
Chelonioidea
Dermochelyidae

  

(Leatherback)
Cheloniidae

 

 (Sea turtles) 
(Hardshell turtles)
Trionychia
Carettochelyidae

 

 (Pig‑nosed turtle) 
Trionychidae

 

 (Softshell turtles) 
 (Hidden‑necked turtles) 

Differences between the two suborders

Neck retraction
 
Cryptodira retract their necks backward.
 
Pleurodira retract their necks sideways.
 
The different mechanisms of neck retraction in the two suborders of turtles

Turtles are divided into two living suborders: Cryptodira and Pleurodira.[128] The two groups differ in the way the neck is retracted for protection. Pleurodirans retract their neck to the side and in front of the shoulder girdles, whereas cryptodirans retract their neck backward into their shell. These motions are enabled by the morphology and arrangement of neck vertebrae.[129][130] Sea turtles (which belong to Cryptodira) have mostly lost the ability to retract their heads.[131]

The adductor muscles in the lower jaw create a pulley-like system in both subgroups. However, the bones that the muscles articulate with differ. In Pleurodira, the pulley is formed with the pterygoid bones of the palate, but in Cryptodira the pulley is formed with the otic capsule. Both systems help to vertically redirect the adductor muscles and maintain a powerful bite.[132]

A further difference between the suborders is the attachment of the pelvis. In Cryptodira, the pelvis is free, linked to the shell only by ligaments. In Pleurodira, the pelvis is sutured, joined with bony connections, to the carapace and to the plastron, creating a pair of large columns of bone at the back end of the turtle, linking the two parts of the shell.[133]

Distribution and habitat

Turtles are widely distributed across the world's continents, oceans, and islands with terrestrial, fully aquatic, and semi-aquatic species. Sea turtles are mainly tropical and subtropical, but leatherbacks can be found in colder areas of the Atlantic and Pacific.[134] Living Pleurodira all live in freshwater and are found only in the Southern Hemisphere.[135] The Cryptodira include terrestrial, freshwater, and marine species, and these range more widely.[134] The world regions richest in non-marine turtle species are the Amazon basin, the Gulf of Mexico drainages of the United States, and parts of South and Southeast Asia.[136]

For turtles in colder climates, their distribution is limited by constraints on reproduction, which is reduced by long hibernations. North American species barely range above the southern Canadian border.[137] Some turtles are found at high altitudes, for example, the species Terrapene ornata occurs up to 2,000 m (6,600 ft) in New Mexico.[138] Conversely, the leatherback sea turtle can dive over 1,200 m (3,900 ft).[139] Species of the genus Gopherus can tolerate both below freezing and over 40 °C (104 °F) in body temperature, though they are most active at 26–34 °C (79–93 °F).[140]

Conservation

 
Many turtles have been killed accidentally in fishing nets.[141] Some trawlers now use nets fitted with turtle excluders.[142] Seen here, a loggerhead escapes a net so fitted.

Among vertebrate orders, turtles are second only to primates in the percentage of threatened species. 360 modern species have existed since 1500 AD. Of these, 51–56% are considered threatened and 60% considered threatened or extinct.[143] Turtles face many threats, including habitat destruction, harvesting for consumption, the pet trade,[144][145] light pollution,[146] and climate change.[147] Asian species have a particularly high extinction risk, primarily due to their long-term unsustainable exploitation for food and medicine,[148] and about 83% of Asia's non-marine turtle species are considered threatened.[143] As of 2021, turtle extinction is progressing much faster than during the Cretaceous-Tertiary extinction. At this rate, all turtles could be extinct in a few centuries.[149]

Turtle hatcheries can be set up when protection against flooding, erosion, predation, or heavy poaching is required.[150][151][152] Chinese markets have sought to satisfy an increasing demand for turtle meat with farmed turtles. In 2007 it was estimated that over a thousand turtle farms operated in China.[153] All the same, wild turtles continue to be caught and sent to market in large numbers, resulting in what conservationists have called "the Asian turtle crisis".[154][148] In the words of the biologist George Amato, the hunting of turtles "vacuumed up entire species from areas in Southeast Asia", even as biologists still did not know how many species lived in the region.[155] In 2000, all the Asian box turtles were placed on the CITES list of endangered species.[148]

Harvesting wild turtles is legal in some American states,[156] and there has been a growing demand for American turtles in China.[157][158] The Florida Fish and Wildlife Conservation Commission estimated in 2008 that around 3,000 pounds of softshell turtles were exported weekly via Tampa International Airport.[158] However, the great majority of turtles exported from the US between 2002 and 2005 were farmed.[157]

Large numbers of sea turtles are accidentally killed in longlines, gillnets, and trawling nets as bycatch. A 2010 study suggested that over 8 million had been killed between 1990 and 2008; the Eastern Pacific and the Mediterranean were identified as among the areas worst affected.[141] Since the 1980s, the United States has required all shrimp trawlers to fit their nets with turtle excluder devices that prevent turtles from being entangled in the net and drowning.[142] More locally, other human activities are affecting marine turtles. In Australia, Queensland's shark culling program, which uses shark nets and drum lines, has killed over 5,000 turtles as bycatch between 1962 and 2015; including 719 loggerhead turtles and 33 hawksbill sea turtles, which are listed as critically endangered.[159]

Native turtle populations can also be threatened by invasive ones. The central North American red-eared slider turtle has been listed among the "world's worst invasive species", pet turtle having been released globally. They appear to compete with native turtle species in eastern and western North America, Europe, and Japan.[160][161]

Human uses

In culture

Main article: Cultural depictions of turtles
Further information: World Turtle

Turtles have featured in human cultures across the world since ancient times. They are generally viewed positively despite not being "cuddly" or flashy; their association with the ancient times and old age have contributed to their endearing image.[162]

In Hindu mythology, the World Turtle, named Kurma or Kacchapa, supports four elephants on his back; they, in turn, carry the weight of the whole world on their backs.[163][164] The turtle is one of the ten avatars or incarnations of the god Vishnu.[163] The yoga pose Kurmasana is named for the avatar.[165][166] World Turtles are found in Native American cultures including the Algonquian, Iroquois, and Lenape. They tell many versions of the creation story of Turtle Island. One version has Muskrat pile up earth on Turtle's back, creating the continent of North America. An Iroquois version has the pregnant Sky Woman fall through a hole in the sky between a tree's roots, where she is caught by birds who land her safely on Turtle's back; the Earth grows around her. The turtle here is altruistic, but the world is a heavy burden, and the turtle sometimes shakes itself to relieve the load, causing earthquakes.[163][167][168]

A turtle was the symbol of the Ancient Mesopotamian god Enki from the 3rd millennium BCE onward.[169] An ancient Greek origin myth told that only the tortoise refused the invitation of the gods Zeus and Hera to their wedding, as it preferred to stay at home. Zeus then ordered it to carry its house with it, ever after.[170] Another of their gods, Hermes, invented a seven-stringed lyre made with the shell of a tortoise.[171] In the Shang dynasty Chinese practice of plastromancy, dating back to 1200 BCE, oracles were obtained by inscribing questions on turtle plastrons using the oldest known form of Chinese characters, burning the plastron, and interpreting the resulting cracks. Later, the turtle was one of the four sacred animals in Confucianism, while in the Han period, steles were mounted on top of stone turtles, later linked with Bixi, the turtle-shelled son of the Dragon King.[172] Marine turtles feature significantly in Australian Aboriginal art.[164] The army of Ancient Rome used the testudo ("tortoise") formation where soldiers would form a shield wall for protection.[161]

In Aesop's Fables, "The Tortoise and the Hare" tells how an unequal race may be won by the slower partner.[173][174] Lewis Carroll's 1865 Alice's Adventures in Wonderland features a Mock Turtle, named for a soup meant to imitate the expensive soup made from real turtle meat.[175][176][177] In 1896, the French playwright Léon Gandillot wrote a comedy in three acts named La Tortue that was "a Parisian sensation"[178] in its run in France, and came to the Manhattan Theatre, Broadway, New York, in 1898 as The Turtle.[179] A "cosmic turtle" and the island motif reappear in Gary Snyder's 1974 novel Turtle Island, and again in Terry Pratchett's Discworld series as Great A'Tuin, starting with the 1983 novel The Colour of Magic. It is supposedly of the species Chelys galactica, the galactic turtle, complete with four elephants on its back to support Discworld.[180] A giant fire-breathing turtle called Gamera is the star of a series of Japanese monster movies in the kaiju genre and has had twelve films from 1965 to 2006.[181] Turtles have been featured in comic books and animations such as the 1984 Teenage Mutant Ninja Turtles.[182][183]

As pets

Some turtles, particularly small terrestrial and freshwater species, are kept as pets.[184][185] The demand for pet turtles increased in the 1950s, with the US being the main supplier, particularly of farm-bred red-eared sliders. The popularity for exotic pets has led to an increase in illegal wildlife trafficking. Around 21% of the value of live animal trade is in reptiles, and turtles are among the more popularly traded species.[186] Poor husbandry of tortoises can cause chronic rhinitis (nasal swelling), overgrown beaks, hyperparathyroidism (which softens their skeleton), constipation, various reproductive problems, and injuries from dogs.[184] In the early 20th century, people in the United States have organized and gambled on turtle races.[187]

As food and other uses

The flesh of captured wild turtles continues to be eaten in Asian cultures,[188] while turtle soup was once a popular dish in English cuisine.[189] Gopher tortoise stew has been popular with some groups in Florida.[190] The supposed aphrodisiac or medicinal properties of turtle eggs created a large trade for them in Southeast Asia.[164] Hard-shell turtle plastrons and soft-shell carapaces are widely used in traditional Chinese medicine; Taiwan imported nearly 200 metric tons of hard-shells from its neighbors yearly from 1999 to 2008.[191] A popular medicinal preparation based on herbs and turtle shells is guilinggao jelly.[192] The substance tortoiseshell, usually from the hawksbill turtle, has been used for centuries to make jewelry, tools, and ornaments around the Western Pacific.[164] Hawksbills have accordingly been hunted for their shells.[193] The trading of tortoiseshell was internationally banned in 1977 by CITES.[194] Some cultures have used turtle shells to make music: Native American shamans made them into ceremonial rattles, while Aztecs, Mayas, and Mixtecs made ayotl drums.[195]

  •  

    Catching turtles in Australia, 1875

  •  

    Turtles on sale as food in Canada, 2007

  •  

    Turtle plastrons for traditional Chinese medicine

  •  

    A tortoiseshell comb; the material was expensive and decorative, and widely used for small items.[196]

  •  

    A pet red-eared slider basking on a floating platform under a sun lamp

See also

References

Citations

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  181. ^ Pryke 2021, pp. 146–148.
  182. ^ Greenberg, Harvey R. (April 15, 1990). "Just How Powerful Are Those Turtles?". The New York Times. from the original on June 12, 2018. Retrieved May 11, 2021.
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  184. ^ a b Reid, Siuna A. (2017). "Current Trends in the Husbandry and Veterinary Care of Tortoises" (PDF). Testudo. 8 (4): 58–68. (PDF) from the original on July 31, 2019. Retrieved July 31, 2019.
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  186. ^ Pryke 2021, pp. 181–183.
  187. ^ Pryke 2021, pp. 120–122.
  188. ^ Barzyk, James E. (November 1999). "Turtles in Crisis: The Asian Food Markets". Tortoise Trust. from the original on February 22, 2015. Retrieved November 1, 2012.
  189. ^ Clarkson, Janet (2010). Soup : a global history. Reaktion. p. 115. ISBN 978-1-86189-774-9. OCLC 642290114.
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  192. ^ Zhang, Huan; Wu, Min-Yi; Guo, De-Jian; et al. (2013). "Gui-ling-gao (turtle jelly), a traditional Chinese functional food, exerts anti-inflammatory effects by inhibiting iNOS and pro-inflammatory cytokine expressions in splenocytes isolated from BALB/c mice". Journal of Functional Foods. 5 (2): 625–632. doi:10.1016/j.jff.2013.01.004. hdl:10397/16357.
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Cited sources

  • Franklin, Carl J. (2011). Turtle: A Extraordinary Natural History 245 Million Years in the Making. Crestline. ISBN 978-0-7858-2775-7.
  • Orenstein, Ronald (2012). Turtles, Tortoises and Terrapins: a Natural History. Firefly Books. ISBN 978-1-77085-119-1. OCLC 791162481.
  • Pryke, Louise (2021). Turtle. Reaktion Books. ISBN 978-1-78914-336-2. OCLC 1223025640.

External links

 
Wikiquote has quotations related to Turtles.
 
Wikimedia Commons has media related to Turtles.
 
The Wikibook Animal Care has a page on the topic of: Turtle
  • Turtle Survival Alliance
  • Turtle Conservancy
  • Symposium on Turtle Evolution

October 14, 2023
turtle, other, uses, disambiguation, chelonian, redirects, here, other, uses, chelonian, disambiguation, order, reptiles, known, testudines, characterized, special, shell, developed, mainly, from, their, ribs, modern, turtles, divided, into, major, groups, ple. For other uses see Turtle disambiguation Chelonian redirects here For other uses see Chelonian disambiguation Turtles are an order of reptiles known as Testudines characterized by a special shell developed mainly from their ribs Modern turtles are divided into two major groups the Pleurodira side necked turtles and Cryptodira hidden necked turtles which differ in the way the head retracts There are 360 living and recently extinct species of turtles including land dwelling tortoises and freshwater terrapins They are found on most continents some islands and in the case of sea turtles much of the ocean Like other amniotes reptiles birds and mammals they breathe air and do not lay eggs underwater although many species live in or around water TurtlesTemporal range Late Jurassic Present PreꞒ Ꞓ O S D C P T J K Pg NTurtles from different families clockwise from top left Red bellied short necked turtle Indian flapshell turtle Hawksbill sea turtle and Galapagos tortoiseScientific classificationDomain EukaryotaKingdom AnimaliaPhylum ChordataClass ReptiliaClade PantestudinesClade TestudinataClade PerichelydiaOrder TestudinesBatsch 1788 1 SubgroupsCryptodiraPleurodira ParacryptodiraDiversity14 living familiesBlue sea turtles black land turtlesSynonyms 2 Chelonii Latreille 1800 Chelonia Ross and Macartney 1802Turtle shells are made mostly of bone the upper part is the domed carapace while the underside is the flatter plastron or belly plate Its outer surface is covered in scales made of keratin the material of hair horns and claws The carapace bones develop from ribs that grow sideways and develop into broad flat plates that join up to cover the body Turtles are ectotherms or cold blooded meaning that their internal temperature varies with their direct environment They are generally opportunistic omnivores and mainly feed on plants and animals with limited movements Many turtles migrate short distances seasonally Sea turtles are the only reptiles that migrate long distances to lay their eggs on a favored beach Turtles have appeared in myths and folktales around the world Some terrestrial and freshwater species are widely kept as pets Turtles have been hunted for their meat for use in traditional medicine and for their shells Sea turtles are often killed accidentally as bycatch in fishing nets Turtle habitats around the world are being destroyed As a result of these pressures many species are extinct or threatened with extinction Contents 1 Naming and etymology 2 Anatomy and physiology 2 1 Size 2 2 Shell 2 3 Head and neck 2 4 Limbs and locomotion 2 5 Senses 2 6 Breathing 2 7 Circulation 2 8 Osmoregulation 2 9 Thermoregulation 3 Behavior 3 1 Diet and feeding 3 2 Communication and intelligence 3 3 Defense 3 4 Migration 4 Reproduction and life cycle 4 1 Courtship and mounting 4 2 Eggs and hatchlings 4 3 Lifespan 5 Systematics and evolution 5 1 Fossil history 5 2 External relationships 5 3 Internal relationships 5 4 Differences between the two suborders 6 Distribution and habitat 7 Conservation 8 Human uses 8 1 In culture 8 2 As pets 8 3 As food and other uses 9 See also 10 References 10 1 Citations 10 2 Cited sources 11 External linksNaming and etymologyThe word turtle is borrowed from the French word tortue or tortre turtle tortoise 3 It is a common name and may be used without knowledge of taxonomic distinctions In North America it may denote the order as a whole In Britain the name is used for sea turtles as opposed to freshwater terrapins and land dwelling tortoises In Australia which lacks true tortoises family Testudinidae non marine turtles were traditionally called tortoises but more recently turtle has been used for the entire group 4 The name of the order Testudines t ɛ ˈ s tj uː d ɪ n iː z teh STEW din eez is based on the Latin word testudo tortoise 5 and was coined by German naturalist August Batsch in 1788 1 The order has also been historically known as Chelonii Latreille 1800 and Chelonia Ross and Macartney 1802 2 which are based on the Ancient Greek word xelwnh chelone tortoise 6 7 Testudines is the official order name due to the principle of priority 2 The term chelonian is used as a formal name for members of the group 1 8 Anatomy and physiologySize The largest living species of turtle and fourth largest reptile is the leatherback turtle which can reach over 2 7 m 8 ft 10 in in length and weigh over 500 kg 1 100 lb 9 The largest known turtle was Archelon ischyros a Late Cretaceous sea turtle up to 4 5 m 15 ft long 5 25 m 17 ft wide between the tips of the front flippers and estimated to have weighed over 2 200 kg 4 900 lb 10 The smallest living turtle is Chersobius signatus of South Africa measuring no more than 10 cm 3 9 in in length 11 and weighing 172 g 6 1 oz 12 Shell Main article Turtle shell nbsp Sagittal section of a tortoise skeletonThe shell of a turtle is unique among vertebrates and serves to protect the animal and provide shelter from the elements 13 14 15 It is primarily made of 50 60 bones and consists of two parts the domed dorsal back carapace and the flatter ventral belly plastron They are connected by lateral side extensions of the plastron 13 16 The carapace is fused with the vertebrae and ribs while the plastron is formed from bones of the shoulder girdle sternum and gastralia abdominal ribs 13 During development the ribs grow sideways into a carapacial ridge unique to turtles entering the dermis inner skin of the back to support the carapace The development is signaled locally by proteins known as fibroblast growth factors that include FGF10 17 The shoulder girdle in turtles is made up of two bones the scapula and the coracoid 18 Both the shoulder and pelvic girdles of turtles are located within the shell and hence are effectively within the rib cage The trunk ribs grow over the shoulder girdle during development 19 nbsp Development of the shell The ribs are growing sideways into the carapacial ridge seen here as a bud to support the carapace 17 The shell is covered in epidermal outer skin scales known as scutes that are made of keratin the same substance that makes up hair and fingernails Typically a turtle has 38 scutes on the carapace and 16 on the plastron giving them 54 in total Carapace scutes are divided into marginals around the margin and vertebrals over the vertebral column though the scute that overlays the neck is called the cervical Pleurals are present between the marginals and vertebrals 20 Plastron scutes include gulars throat humerals pectorals abdominals and anals Side necked turtles additionally have intergular scutes between the gulars 16 21 Turtle scutes are usually structured like mosaic tiles but some species like the hawksbill sea turtle have overlapping scutes on the carapace 16 The shapes of turtle shells vary with the adaptations of the individual species and sometimes with sex Land dwelling turtles are more dome shaped which appears to make them more resistant to being crushed by large animals Aquatic turtles have flatter smoother shells that allow them to cut through the water Sea turtles in particular have streamlined shells that reduce drag and increase stability in the open ocean Some turtle species have pointy or spiked shells that provide extra protection from predators and camouflage against the leafy ground The lumps of a tortoise shell can tilt its body when it gets flipped over allowing it to flip back In male tortoises the tip of the plastron is thickened and used for butting and ramming during combat 22 Shells vary in flexibility Some species such as box turtles lack the lateral extensions and instead have the carapace bones fully fused or ankylosed together Several species have hinges on their shells usually on the plastron which allow them to expand and contract Softshell turtles have rubbery edges due to the loss of bones The leatherback turtle has hardly any bones in its shell but has thick connective tissue and an outer layer of leathery skin 23 Head and neck nbsp Head and neck of a European pond turtleThe turtle s skull is unique among living amniotes which includes reptiles birds and mammals it is solid and rigid with no openings for muscle attachment temporal fenestrae 24 25 Muscles instead attach to recesses in the back of the skull Turtle skulls vary in shape from the long and narrow skulls of softshells to the broad and flattened skull of the mata mata 25 Some turtle species have developed large and thick heads allowing for greater muscle mass and stronger bites 26 Turtles that are carnivorous or durophagous eating hard shelled animals have the most powerful bites For example the durophagous Mesoclemmys nasuta has a bite force of 432 lbf 1 920 N Species that are insectivorous piscivorous fish eating or omnivorous have lower bite forces 27 Living turtles lack teeth but have beaks made of keratin sheaths along the edges of the jaws 28 13 These sheaths may have sharp edges for cutting meat serrations for clipping plants or broad plates for breaking mollusks 29 The necks of turtles are highly flexible possibly to compensate for their rigid shells Some species like sea turtles have short necks while others such as snake necked turtles have long ones Despite this all turtle species have eight neck vertebrae a consistency not found in other reptiles but similar to mammals 30 Some snake necked turtles have both long necks and large heads limiting their ability to lift them when not in water 26 Some turtles have folded structures in the larynx or glottis that vibrate to produce sound Other species have elastin rich vocal cords 31 32 Limbs and locomotion Due to their heavy shells turtles are slow moving on land A desert tortoise moves at only 0 22 0 48 km h 0 14 0 30 mph By contrast sea turtles can swim at 30 km h 19 mph 13 The limbs of turtles are adapted for various means of locomotion and habits and most have five toes Tortoises are specialized for terrestrial environments and have column like legs with elephant like feet and short toes The gopher tortoise has flattened front limbs for digging in the substrate Freshwater turtles have more flexible legs and longer toes with webbing giving them thrust in the water Some of these species such as snapping turtles and mud turtles mainly walk along the water bottom as they would on land Others such as terrapins swim by paddling with all four limbs switching between the opposing front and hind limbs which keeps their direction stable 13 33 nbsp Sea turtles have streamlined shells and limbs adapted for fast and efficient swimming 34 Sea turtles and the pig nosed turtle are the most specialized for swimming Their front limbs have evolved into flippers while the shorter hind limbs are shaped more like rudders The front limbs provide most of the thrust for swimming while the hind limbs serve as stabilizers 13 35 Sea turtles such as the green sea turtle rotate the front limb flippers like a bird s wings to generate a propulsive force on both the upstroke and on the downstroke This is in contrast to similar sized freshwater turtles measurements having been made on young animals in each case such as the Caspian turtle which uses the front limbs like the oars of a rowing boat creating substantial negative thrust on the recovery stroke in each cycle In addition the streamlining of the marine turtles reduces drag As a result marine turtles produce a propulsive force twice as large and swim six times as fast as freshwater turtles The swimming efficiency of young marine turtles is similar to that of fast swimming fish of open water like mackerel 34 Compared to other reptiles turtles tend to have reduced tails but these vary in both length and thickness among species and between sexes Snapping turtles and the big headed turtle have longer tails the latter uses it for balance while climbing The cloaca is found underneath and at the base and the tail itself houses the reproductive organs Hence males have longer tails to contain the penis In sea turtles the tail is longer and more prehensile in males who use it to grasp mates Several turtle species have spines on their tails 36 24 Senses nbsp The red eared slider has an exceptional seven types of color detecting cells in its eyes 37 Turtles make use of vision to find food and mates avoid predators and orient themselves The retina s light sensitive cells include both rods for vision in low light and cones with three different photopigments for bright light where they have full color vision There is possibly a fourth type of cone that detects ultraviolet as hatchling sea turtles respond experimentally to ultraviolet light but it is unknown if they can distinguish this from longer wavelengths A freshwater turtle the red eared slider has an exceptional seven types of cone cell 37 38 39 Sea turtles orient themselves on land by night using visual features detected in dim light They can use their eyes in clear surface water muddy coasts the darkness of the deep ocean and also above water Unlike in terrestrial turtles the cornea the curved surface that lets light into the eye does not help to focus light on the retina so focusing underwater is handled entirely by the lens behind the cornea The cone cells contain oil droplets placed to shift perception toward the red part of the spectrum improving color discrimination Visual acuity studied in hatchlings is highest in a horizontal band with retinal cells packed about twice as densely as elsewhere This gives the best vision along the visual horizon Sea turtles do not appear to use polarized light for orientation as many other animals do The deep diving leatherback turtle lacks specific adaptations to low light such as large eyes large lenses or a reflective tapetum It may rely on seeing the bioluminescence of prey when hunting in deep water 37 Turtles have no ear openings the eardrum is covered with scales and encircled by a bony otic capsule which is absent in other reptiles 30 Their hearing thresholds are high in comparison to other reptiles reaching up to 500 Hz in air but underwater they are more attuned to lower frequencies 40 The loggerhead sea turtle has been shown experimentally to respond to low sounds with maximal sensitivity between 100 and 400 Hz 41 Turtles have olfactory smell and vomeronasal receptors along the nasal cavity the latter of which are used to detect chemical signals 42 Experiments on green sea turtles showed they could learn to respond to a selection of different odorant chemicals such as triethylamine and cinnamaldehyde which were detected by olfaction in the nose Such signals could be used in navigation 43 Breathing nbsp A submerged Indian softshell turtle nose breathing at river surfaceThe rigid shell of turtles is not capable of expanding and making room for the lungs as in other amniotes so they have had to evolve special adaptations for respiration 44 45 46 The lungs of turtles are attached directly to the carapace above while below connective tissue attaches them to the organs 47 They have multiple lateral side and medial middle chambers the numbers of which vary between species and one terminal end chamber 48 The lungs are ventilated using specific groups of abdominal muscles attached to the organs that pull and push on them 44 Specifically it is the turtle s large liver that compresses the lungs Underneath the lungs in the coelomic cavity the liver is connected to the right lung by the root and the stomach is directly attached to the left lung and to the liver by a mesentery When the liver is pulled down inhalation begins 45 Supporting the lungs is a wall or septum which is thought to prevent them from collapsing 49 During exhalation the contraction of the transversus abdominis muscle propels the organs into the lungs and expels air Conversely during inhalation the relaxing and flattening of the oblique abdominis muscle pulls the transversus back down allowing air back into the lungs 45 Although many turtles spend large amounts of their lives underwater all turtles breathe air and must surface at regular intervals to refill their lungs Depending on the species immersion periods vary between a minute and an hour 50 Some species can respire through the cloaca which contains large sacs that are lined with many finger like projections that take up dissolved oxygen from the water 51 Circulation nbsp Snapping turtle emerging from period of brumation in which it buried itself in mud Turtles have multiple circulatory and physiological adaptations to enable them to go long periods without breathing 52 Turtles share the linked circulatory and pulmonary lung systems of vertebrates where the three chambered heart pumps deoxygenated blood through the lungs and then pumps the returned oxygenated blood through the body s tissues The cardiopulmonary system has both structural and physiological adaptations that distinguish it from other vertebrates Turtles have a large lung volume and can move blood through non pulmonary blood vessels including some within the heart to avoid the lungs while they are not breathing They can hold their breath for much longer periods than other reptiles and they can tolerate the resulting low oxygen levels They can moderate the increase in acidity during anaerobic non oxygen based respiration by chemical buffering and they can lie dormant for months in aestivation or brumation 52 The heart has two atria but only one ventricle The ventricle is subdivided into three chambers A muscular ridge enables a complex pattern of blood flow so that the blood can be directed either to the lungs via the pulmonary artery or to the body via the aorta The ability to separate the two outflows varies between species The leatherback has a powerful muscular ridge enabling almost complete separation of the outflows supporting its actively swimming lifestyle The ridge is less well developed in freshwater turtles like the sliders Trachemys 52 Turtles are capable of enduring periods of anaerobic respiration longer than many other vertebrates This process breaks down sugars incompletely to lactic acid rather than all the way to carbon dioxide and water as in aerobic oxygen based respiration 52 They make use of the shell as a source of additional buffering agents for combating increased acidity and as a sink for lactic acid 53 Osmoregulation In sea turtles the bladder is one unit and in most freshwater turtles it is double lobed 54 Sea turtle bladders are connected to two small accessory bladders located at the sides to the neck of the urinary bladder and above the pubis 55 Arid living tortoises have bladders that serve as reserves of water storing up to 20 of their body weight in fluids The fluids are normally low in solutes but higher during droughts when the reptile gains potassium salts from its plant diet The bladder stores these salts until the tortoise finds fresh drinking water 56 To regulate the amount of salt in their bodies sea turtles and the brackish living diamondback terrapin secrete excess salt in a thick sticky substance from their tear glands Because of this sea turtles may appear to be crying when on land 57 Thermoregulation nbsp Smaller pond turtles like these northern red bellied cooters regulate their temperature by basking in the sun Turtles like other reptiles have a limited ability to regulate their body temperature This ability varies between species and with body size Small pond turtles regulate their temperature by crawling out of the water and basking in the sun while small terrestrial turtles move between sunny and shady places to adjust their temperature Large species both terrestrial and marine have sufficient mass to give them substantial thermal inertia meaning that they heat up or cool down over many hours The Aldabra giant tortoise weighs up to some 60 kilograms 130 lb and is able to allow its temperature to rise to some 33 C 91 F on a hot day and to fall naturally to around 29 C 84 F by night Some giant tortoises seek out shade to avoid overheating on sunny days On Grand Terre Island food is scarce inland shade is scarce near the coast and the tortoises compete for space under the few trees on hot days Large males may push smaller females out of the shade and some then overheat and die 58 Adult sea turtles too have large enough bodies that they can to some extent control their temperature The largest turtle the leatherback can swim in the waters off Nova Scotia which may be as cold as 8 C 46 F while their body temperature has been measured at up to 12 C 22 F warmer than the surrounding water To help keep their temperature up they have a system of countercurrent heat exchange in the blood vessels between their body core and the skin of their flippers The vessels supplying the head are insulated by fat around the neck 58 BehaviorDiet and feeding nbsp A green sea turtle grazing on seagrassMost turtle species are opportunistic omnivores land dwelling species are more herbivorous and aquatic ones more carnivorous 26 Generally lacking speed and agility most turtles feed either on plant material or on animals with limited movements like mollusks worms and insect larvae 13 Some species such as the African helmeted turtle and snapping turtles eat fish amphibians reptiles including other turtles birds and mammals They may take them by ambush but also scavenge 59 The alligator snapping turtle has a worm like appendage on its tongue that it uses to lure fish into its mouth Tortoises are the most herbivorous group consuming grasses leaves and fruits 60 Many turtle species including tortoises supplement their diet with eggshells animal bones hair and droppings for extra nutrients 61 Turtles generally eat their food in a straightforward way though some species have special feeding techniques 13 The yellow spotted river turtle and the painted turtle may filter feed by skimming the water surface with their mouth and throat open to collect particles of food When the mouth closes the throat constricts and water is pushed out through the nostrils and the gap in between the jaws 62 Some species employ a gape and suck method where the turtle opens its jaws and expands its throat widely sucking the prey in 13 63 64 The diet of an individual within a species may change with age sex and season and may also differ between populations In many species juveniles are generally carnivorous but become more herbivorous as adults 13 65 With Barbour s map turtle the larger female mainly eats mollusks while the male usually eats arthropods 13 Blanding s turtle may feed mainly on snails or crayfish depending on the population The European pond turtle has been recorded as being mostly carnivorous much of the year but switching to water lilies during the summer 66 Some species have developed specialized diets such as the hawksbill which eats sponges the leatherback which feeds on jellyfish and the Mekong snail eating turtle 26 13 Communication and intelligence nbsp The oblong turtle has a sizable vocal repertoire 67 See also Animal cognition While popularly thought of as mute turtles make various sounds to communicate 68 69 One study which recorded 53 species found that all of them vocalized 70 Tortoises may bellow when courting and mating 69 30 Various species of both freshwater and sea turtles emit short low frequency calls from the time they are in the egg to when they are adults These vocalizations may serve to create group cohesion when migrating 69 The oblong turtle has a particularly large vocal range producing sounds described as clacks clicks squawks hoots various kinds of chirps wails hooos grunts growls blow bursts howls and drum rolls 67 Play behavior has been documented in some turtle species 71 In the laboratory Florida red bellied cooters can learn novel tasks and have demonstrated a long term memory of at least 7 5 months 72 Similarly giant tortoises can learn and remember tasks and master lessons much faster when trained in groups 73 Tortoises appear to be able to retain operant conditioning nine years after their initial training 74 Studies have shown that turtles can navigate the environment using landmarks and a map like system resulting in accurate direct routes towards a goal 75 Navigation in turtles have been correlated to high cognition function in the medial cortex region of the brain 75 76 nbsp Crested caracara eating a turtleDefense See also Anti predator adaptation When sensing danger a turtle may flee freeze or withdraw into its shell Freshwater turtles flee into the water though the Sonora mud turtle may take refuge on land as the shallow temporary ponds they inhabit make them vulnerable 77 When startled a softshell turtle may dive underwater and bury itself under the sea floor 78 If a predator persists the turtle may bite or discharge from its cloaca Several species produce foul smelling chemicals from musk glands Other tactics include threat displays and Bell s hinge back tortoise can play dead When attacked big headed turtle hatchlings squeal possibly startling the predator 79 Migration Further information Sea turtle migration nbsp An olive ridley sea turtle nesting on Escobilla Beach Oaxaca Mexico Female sea turtles migrate long distances to nest on favored beaches Turtles are the only reptiles that migrate long distances more specifically the marine species that can travel up to thousands of kilometers Some non marine turtles such as the species of Geochelone terrestrial Chelydra freshwater and Malaclemys estuarine migrate seasonally over much shorter distances up to around 27 km 17 mi to lay eggs Such short migrations are comparable to those of some lizards snakes and crocodilians 80 Sea turtles nest in a specific area such as a beach leaving the eggs to hatch unattended The young turtles leave that area migrating long distances in the years or decades in which they grow to maturity and then return seemingly to the same area every few years to mate and lay eggs though the precision varies between species and populations This natal homing has appeared remarkable to biologists though there is now plentiful evidence for it including from genetics 81 How sea turtles navigate to their breeding beaches remains unknown One possibility is imprinting as in salmon where the young learn the chemical signature effectively the scent of their home waters before leaving and remember that when the time comes for them to return as adults Another possible cue is the orientation of the earth s magnetic field at the natal beach There is experimental evidence that turtles have an effective magnetic sense and that they use this in navigation Proof that homing occurs is derived from genetic analysis of populations of loggerheads hawksbills leatherbacks and olive ridleys by nesting place For each of these species the populations in different places have their own mitochondrial DNA genetic signatures that persist over the years This shows that the populations are distinct and that homing must be occurring reliably 81 Reproduction and life cycle nbsp Desert tortoises fightingTurtles have a wide variety of mating behaviors but do not form pair bonds or social groups 82 In green sea turtles females generally outnumber males 83 In terrestrial species males are often larger than females and fighting between males establishes a dominance hierarchy for access to mates For most semi aquatic and bottom walking aquatic species combat occurs less often Males of these species instead may use their size advantage to mate forcibly In fully aquatic species males are often smaller than females and rely on courtship displays to gain mating access to females 84 Courtship and mounting Courtship varies between species and with habitat It is often complex in aquatic species both marine and freshwater but simpler in the semi aquatic mud turtles and snapping turtles A male tortoise bobs his head then subdues the female by biting and butting her before mounting 13 The male scorpion mud turtle approaches the female from the rear and often resorts to aggressive methods such as biting the female s tail or hind limbs followed by a mounting 85 Female choice is important in some species and female green sea turtles are not always receptive As such they have evolved behaviors to avoid the male s attempts at copulation such as swimming away confronting the male followed by biting or taking up a refusal position with her body vertical her limbs widely outspread and her plastron facing the male If the water is too shallow for the refusal position the females resort to beaching themselves as the males do not follow them ashore 83 nbsp Mounting behavior in the three toed box turtleAll turtles fertilize internally mounting and copulation can be difficult In many species males have a concave plastron that interlocks with the female s carapace In species like the Russian tortoise the male has a lighter shell and longer legs The high rounded shape of box turtles are particular obstacles for mounting The male eastern box turtle leans backward and hooks onto the back of the female s plastron 86 Aquatic turtles mount in water 87 88 and female sea turtles support the mounting male while swimming and diving 89 During copulation the male turtle aligns his tail with the female s so he can insert his penis into her cloaca 90 Some female turtles can store sperm from multiple males and their egg clutches can have multiple sires 91 82 Eggs and hatchlings nbsp A female common snapping turtle depositing her eggs in a hole she dugTurtles including sea turtles lay their eggs on land although some lay eggs near water that rises and falls in level submerging the eggs While most species build nests and lay eggs where they forage some travel miles The common snapping turtle walks 5 km 3 mi on land while sea turtles travel even further the leatherback swims some 12 000 km 7 500 mi to its nesting beaches 13 88 Most turtles create a nest for their eggs Females usually dig a flask like chamber in the substrate Other species lay their eggs in vegetation or crevices 92 Females choose nesting locations based on environmental factors such as temperature and humidity which are important for developing embryos 88 Depending on the species the number of eggs laid varies from one to over 100 Larger females can lay eggs that are greater in number or bigger in size Compared to freshwater turtles tortoises deposit fewer but larger eggs Females can lay multiple clutches throughout a season particularly in species that experience unpredictable monsoons 93 nbsp Marginated tortoise emerges from its eggMost mother turtles do no more in the way of parental care than covering their eggs and immediately leaving though some species guard their nests for days or weeks 94 Eggs vary between rounded oval elongated and between hard and soft shelled 95 Most species have their sex determined by temperature In some species higher temperatures produce females and lower ones produce males while in others milder temperatures produce males and both hot and cold extremes produce females 13 There is experimental evidence that the embryos of Mauremys reevesii can move around inside their eggs to select the best temperature for development thus influencing their sexual destiny 96 In other species sex is determined genetically The length of incubation for turtle eggs varies from two to three months for temperate species and four months to over a year for tropical species 13 Species that live in warm temperate climates can delay their development 97 Hatching young turtles break out of the shell using an egg tooth a sharp projection that exists temporarily on their upper beak 13 98 Hatchlings dig themselves out of the nest and find safety in vegetation or water Some species stay in the nest for longer be it for overwintering or to wait for the rain to loosen the soil for them to dig out 13 Young turtles are highly vulnerable to predators both in the egg and as hatchlings Mortality is high during this period but significantly decreases when they reach adulthood Most species grow quickly during their early years and slow down when they are mature 99 Lifespan Turtles can live long lives The oldest living turtle and land animal is said to be a Seychelles giant tortoise named Jonathan who turned 187 in 2019 100 A Galapagos tortoise named Harriet was collected by Charles Darwin in 1835 it died in 2006 having lived for at least 176 years Most wild turtles do not reach that age Turtles keep growing new scutes under the previous scutes every year allowing researchers to estimate how long they have lived 101 They also age slowly 102 The survival rate for adult turtles can reach 99 per year 13 Systematics and evolutionFurther information Turtle classification and List of Testudines families Fossil history nbsp Diagram of the origins of the turtle body plan through the Triassic isolated bony plates evolved to form a complete shell in a sequence involving Pappochelys Eorhynchochelys Odontochelys and Proganochelys 19 Zoologists have sought to explain the evolutionary origin of the turtles and in particular of their unique shells In 1914 Jan Versluys proposed that bony plates in the dermis called osteoderms fused to the ribs beneath them later called the Polka Dot Ancestor by Olivier Rieppel 19 103 The theory accounted for the evolution of fossil pareiasaurs from Bradysaurus to Anthodon but not for how the ribs could have become attached to the bony dermal plates 19 More recent discoveries have painted a different scenario for the evolution of the turtle s shell The stem turtles Eunotosaurus of the Middle Permian Pappochelys of the Middle Triassic and Eorhynchochelys of the Late Triassic lacked carapaces and plastrons but had shortened torsos expanded ribs and lengthened dorsal vertebrae Also in the Late Triassic Odontochelys had a partial shell consisting of a complete bony plastron and an incomplete carapace The development of a shell reached completion with the Late Triassic Proganochelys with its fully developed carapace and plastron 19 104 Adaptations that lead to the evolution of the shell may have originally been for digging and a fossorial lifestyle 104 The oldest known members of the Pleurodira lineage are the Platychelyidae from the Late Jurassic 105 The oldest known unambiguous cryptodire is Sinaspideretes a close relative of softshell turtles from the Late Jurassic of China 106 During the Late Cretaceous and Cenozoic members of the pleurodire families Bothremydidae and Podocnemididae became widely distributed in the Northern Hemisphere due to their coastal habits 107 108 The oldest known soft shelled turtles and sea turtles appeared during the Early Cretaceous 109 110 Tortoises originated in Asia during the Eocene 111 A late surviving group of stem turtles the Meiolaniidae survived in Australasia into the Pleistocene and Holocene 112 External relationships The turtles exact ancestry has been disputed It was believed they were the only surviving branch of the ancient evolutionary grade Anapsida which includes groups such as procolophonids and pareiasaurs All anapsid skulls lack a temporal opening while all other living amniotes have temporal openings 113 It was later suggested that the anapsid like turtle skulls may be due to backward evolution rather than to anapsid descent 114 Fossil evidence has shown that early stem turtles possessed small temporal openings 104 Some early morphological phylogenetic studies have placed turtles closer to Lepidosauria tuataras lizards and snakes than to Archosauria crocodilians and birds 113 By contrast several molecular studies place turtles either within Archosauria 115 or more commonly as a sister group to extant archosaurs 114 116 117 118 though an analysis conducted by Tyler Lyson and colleagues 2012 recovered turtles as the sister group of lepidosaurs instead 119 Ylenia Chiari and colleagues 2012 analyzed 248 nuclear genes from 16 vertebrates and suggested that turtles share a more recent common ancestor with birds and crocodilians The date of separation of turtles and birds and crocodilians was estimated to be 255 million years ago during the Permian 120 Through genomic scale phylogenetic study of ultra conserved elements UCEs to clarify the placement of turtles within reptiles Nicholas Crawford and colleagues 2012 similarly found that turtles are closer to birds and crocodilians 121 Using the draft unfinished genome sequences of the green sea turtle and the Chinese softshell turtle Zhuo Wang and colleagues 2013 concluded that turtles are likely a sister group of crocodilians and birds 122 The external phylogeny of the turtles is shown in the cladogram below 121 Diapsida Archosauromorpha Crocodilia crocodiles alligators nbsp Aves birds nbsp Testudines nbsp Lepidosauromorpha Squamata lizards snakes nbsp Internal relationships Modern turtles and their extinct relatives with a complete shell are classified within the clade Testudinata 123 The most recent common ancestor of living turtles corresponding to the split between Pleurodira side necked species and Cryptodira hidden necked species is estimated to have occurred around 210 million years ago during the Late Triassic 124 Robert Thompson and colleagues 2021 comment that living turtles have low diversity relative to how long they existed Diversity has been stable according to their analysis except for a single rapid increase around the Eocene Oligocene boundary some 30 million years ago and a large regional extinction at roughly the same time They suggest that global climate change caused both events as the cooling and drying caused the land to become arid and turtles to become extinct there while new continental margins opened up by the climate change provided habitats for other species to evolve 125 The cladogram from Nicholas Crawford and colleagues 2015 shows the internal phylogeny of the Testudines down to the level of families 126 127 The analysis by Thompson and colleagues in 2021 supports the same structure down to the family level 125 Testudines Pleurodira Pelomedusidae nbsp Podocnemididae nbsp Chelidae nbsp Side necked turtles Cryptodira Testudinoidea Testudinidae nbsp Tortoises Geoemydidae nbsp Platysternidae nbsp Emydidae nbsp Terrapins Chelydroidea Chelydridae nbsp Snapping turtles Dermatemydidae nbsp Kinosternidae nbsp Chelonioidea Dermochelyidae nbsp Leatherback Cheloniidae nbsp Sea turtles Hardshell turtles Trionychia Carettochelyidae nbsp Pig nosed turtle Trionychidae nbsp Softshell turtles Hidden necked turtles Differences between the two suborders Neck retraction nbsp Cryptodira retract their necks backward nbsp Pleurodira retract their necks sideways nbsp The different mechanisms of neck retraction in the two suborders of turtles Turtles are divided into two living suborders Cryptodira and Pleurodira 128 The two groups differ in the way the neck is retracted for protection Pleurodirans retract their neck to the side and in front of the shoulder girdles whereas cryptodirans retract their neck backward into their shell These motions are enabled by the morphology and arrangement of neck vertebrae 129 130 Sea turtles which belong to Cryptodira have mostly lost the ability to retract their heads 131 The adductor muscles in the lower jaw create a pulley like system in both subgroups However the bones that the muscles articulate with differ In Pleurodira the pulley is formed with the pterygoid bones of the palate but in Cryptodira the pulley is formed with the otic capsule Both systems help to vertically redirect the adductor muscles and maintain a powerful bite 132 A further difference between the suborders is the attachment of the pelvis In Cryptodira the pelvis is free linked to the shell only by ligaments In Pleurodira the pelvis is sutured joined with bony connections to the carapace and to the plastron creating a pair of large columns of bone at the back end of the turtle linking the two parts of the shell 133 Distribution and habitatTurtles are widely distributed across the world s continents oceans and islands with terrestrial fully aquatic and semi aquatic species Sea turtles are mainly tropical and subtropical but leatherbacks can be found in colder areas of the Atlantic and Pacific 134 Living Pleurodira all live in freshwater and are found only in the Southern Hemisphere 135 The Cryptodira include terrestrial freshwater and marine species and these range more widely 134 The world regions richest in non marine turtle species are the Amazon basin the Gulf of Mexico drainages of the United States and parts of South and Southeast Asia 136 For turtles in colder climates their distribution is limited by constraints on reproduction which is reduced by long hibernations North American species barely range above the southern Canadian border 137 Some turtles are found at high altitudes for example the species Terrapene ornata occurs up to 2 000 m 6 600 ft in New Mexico 138 Conversely the leatherback sea turtle can dive over 1 200 m 3 900 ft 139 Species of the genus Gopherus can tolerate both below freezing and over 40 C 104 F in body temperature though they are most active at 26 34 C 79 93 F 140 Conservation nbsp Many turtles have been killed accidentally in fishing nets 141 Some trawlers now use nets fitted with turtle excluders 142 Seen here a loggerhead escapes a net so fitted Among vertebrate orders turtles are second only to primates in the percentage of threatened species 360 modern species have existed since 1500 AD Of these 51 56 are considered threatened and 60 considered threatened or extinct 143 Turtles face many threats including habitat destruction harvesting for consumption the pet trade 144 145 light pollution 146 and climate change 147 Asian species have a particularly high extinction risk primarily due to their long term unsustainable exploitation for food and medicine 148 and about 83 of Asia s non marine turtle species are considered threatened 143 As of 2021 turtle extinction is progressing much faster than during the Cretaceous Tertiary extinction At this rate all turtles could be extinct in a few centuries 149 Turtle hatcheries can be set up when protection against flooding erosion predation or heavy poaching is required 150 151 152 Chinese markets have sought to satisfy an increasing demand for turtle meat with farmed turtles In 2007 it was estimated that over a thousand turtle farms operated in China 153 All the same wild turtles continue to be caught and sent to market in large numbers resulting in what conservationists have called the Asian turtle crisis 154 148 In the words of the biologist George Amato the hunting of turtles vacuumed up entire species from areas in Southeast Asia even as biologists still did not know how many species lived in the region 155 In 2000 all the Asian box turtles were placed on the CITES list of endangered species 148 Harvesting wild turtles is legal in some American states 156 and there has been a growing demand for American turtles in China 157 158 The Florida Fish and Wildlife Conservation Commission estimated in 2008 that around 3 000 pounds of softshell turtles were exported weekly via Tampa International Airport 158 However the great majority of turtles exported from the US between 2002 and 2005 were farmed 157 Large numbers of sea turtles are accidentally killed in longlines gillnets and trawling nets as bycatch A 2010 study suggested that over 8 million had been killed between 1990 and 2008 the Eastern Pacific and the Mediterranean were identified as among the areas worst affected 141 Since the 1980s the United States has required all shrimp trawlers to fit their nets with turtle excluder devices that prevent turtles from being entangled in the net and drowning 142 More locally other human activities are affecting marine turtles In Australia Queensland s shark culling program which uses shark nets and drum lines has killed over 5 000 turtles as bycatch between 1962 and 2015 including 719 loggerhead turtles and 33 hawksbill sea turtles which are listed as critically endangered 159 Native turtle populations can also be threatened by invasive ones The central North American red eared slider turtle has been listed among the world s worst invasive species pet turtle having been released globally They appear to compete with native turtle species in eastern and western North America Europe and Japan 160 161 Human usesIn culture Main article Cultural depictions of turtles Further information World Turtle nbsp 4th century sculpture of turtle avatar of Vishnu Garhwa India nbsp World resting on four elephants on the back of the World Turtle Western depiction of The Hindu Earth 1877 nbsp Bixi supporting Kangxi Emperor s stele Beijing 1698 nbsp The Mock Turtle in Lewis Carroll s 1865 Alice s Adventures in Wonderland nbsp Poster for 1898 production of The Turtle at the Manhattan Theatre Broadway nbsp Terrapin shell leg rattles worn by lead Cherokee woman dancer 20th centuryTurtles have featured in human cultures across the world since ancient times They are generally viewed positively despite not being cuddly or flashy their association with the ancient times and old age have contributed to their endearing image 162 In Hindu mythology the World Turtle named Kurma or Kacchapa supports four elephants on his back they in turn carry the weight of the whole world on their backs 163 164 The turtle is one of the ten avatars or incarnations of the god Vishnu 163 The yoga pose Kurmasana is named for the avatar 165 166 World Turtles are found in Native American cultures including the Algonquian Iroquois and Lenape They tell many versions of the creation story of Turtle Island One version has Muskrat pile up earth on Turtle s back creating the continent of North America An Iroquois version has the pregnant Sky Woman fall through a hole in the sky between a tree s roots where she is caught by birds who land her safely on Turtle s back the Earth grows around her The turtle here is altruistic but the world is a heavy burden and the turtle sometimes shakes itself to relieve the load causing earthquakes 163 167 168 A turtle was the symbol of the Ancient Mesopotamian god Enki from the 3rd millennium BCE onward 169 An ancient Greek origin myth told that only the tortoise refused the invitation of the gods Zeus and Hera to their wedding as it preferred to stay at home Zeus then ordered it to carry its house with it ever after 170 Another of their gods Hermes invented a seven stringed lyre made with the shell of a tortoise 171 In the Shang dynasty Chinese practice of plastromancy dating back to 1200 BCE oracles were obtained by inscribing questions on turtle plastrons using the oldest known form of Chinese characters burning the plastron and interpreting the resulting cracks Later the turtle was one of the four sacred animals in Confucianism while in the Han period steles were mounted on top of stone turtles later linked with Bixi the turtle shelled son of the Dragon King 172 Marine turtles feature significantly in Australian Aboriginal art 164 The army of Ancient Rome used the testudo tortoise formation where soldiers would form a shield wall for protection 161 In Aesop s Fables The Tortoise and the Hare tells how an unequal race may be won by the slower partner 173 174 Lewis Carroll s 1865 Alice s Adventures in Wonderland features a Mock Turtle named for a soup meant to imitate the expensive soup made from real turtle meat 175 176 177 In 1896 the French playwright Leon Gandillot wrote a comedy in three acts named La Tortue that was a Parisian sensation 178 in its run in France and came to the Manhattan Theatre Broadway New York in 1898 as The Turtle 179 A cosmic turtle and the island motif reappear in Gary Snyder s 1974 novel Turtle Island and again in Terry Pratchett s Discworld series as Great A Tuin starting with the 1983 novel The Colour of Magic It is supposedly of the species Chelys galactica the galactic turtle complete with four elephants on its back to support Discworld 180 A giant fire breathing turtle called Gamera is the star of a series of Japanese monster movies in the kaiju genre and has had twelve films from 1965 to 2006 181 Turtles have been featured in comic books and animations such as the 1984 Teenage Mutant Ninja Turtles 182 183 As pets Some turtles particularly small terrestrial and freshwater species are kept as pets 184 185 The demand for pet turtles increased in the 1950s with the US being the main supplier particularly of farm bred red eared sliders The popularity for exotic pets has led to an increase in illegal wildlife trafficking Around 21 of the value of live animal trade is in reptiles and turtles are among the more popularly traded species 186 Poor husbandry of tortoises can cause chronic rhinitis nasal swelling overgrown beaks hyperparathyroidism which softens their skeleton constipation various reproductive problems and injuries from dogs 184 In the early 20th century people in the United States have organized and gambled on turtle races 187 As food and other uses The flesh of captured wild turtles continues to be eaten in Asian cultures 188 while turtle soup was once a popular dish in English cuisine 189 Gopher tortoise stew has been popular with some groups in Florida 190 The supposed aphrodisiac or medicinal properties of turtle eggs created a large trade for them in Southeast Asia 164 Hard shell turtle plastrons and soft shell carapaces are widely used in traditional Chinese medicine Taiwan imported nearly 200 metric tons of hard shells from its neighbors yearly from 1999 to 2008 191 A popular medicinal preparation based on herbs and turtle shells is guilinggao jelly 192 The substance tortoiseshell usually from the hawksbill turtle has been used for centuries to make jewelry tools and ornaments around the Western Pacific 164 Hawksbills have accordingly been hunted for their shells 193 The trading of tortoiseshell was internationally banned in 1977 by CITES 194 Some cultures have used turtle shells to make music Native American shamans made them into ceremonial rattles while Aztecs Mayas and Mixtecs made ayotl drums 195 nbsp Catching turtles in Australia 1875 nbsp Turtles on sale as food in Canada 2007 nbsp Turtle plastrons for traditional Chinese medicine nbsp A tortoiseshell comb the material was expensive and decorative and widely used for small items 196 nbsp A pet red eared slider basking on a floating platform under a sun lampSee alsoWorld Turtle DayReferencesCitations a b c Turtle Taxonomy Working Group 2017 Turtles of the World Annotated Checklist and Atlas of Taxonomy Synonymy Distribution and Conservation Status PDF pp 10 24 doi 10 3854 crm 7 checklist atlas v8 2017 ISBN 978 1 5323 5026 9 OCLC 1124067380 Archived PDF from the original on February 25 2021 Retrieved January 20 2018 a href Template Cite book html title Template Cite book cite book a journal ignored help a 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004 hdl 10397 16357 Cox Lisa November 12 2018 Hawksbill Turtle Poaching to be Fought with DNA Technology The Guardian Retrieved August 7 2021 Hawksbills are the only sea turtles hunted for their shells despite international trade in hawksbill products being banned more than 20 years ago Global Status of the Hawksbill Sea Turtle The Tortoiseshell Trade Sea Turtle Conservancy 2007 Pryke 2021 pp 58 60 Strieker Gary April 10 2001 Tortoiseshell Ban Threatens Japanese Tradition CNN Archived from the original on December 15 2006 Retrieved May 11 2021 Cited sources Franklin Carl J 2011 Turtle A Extraordinary Natural History 245 Million Years in the Making Crestline ISBN 978 0 7858 2775 7 Orenstein Ronald 2012 Turtles Tortoises and Terrapins a Natural History Firefly Books ISBN 978 1 77085 119 1 OCLC 791162481 Pryke Louise 2021 Turtle Reaktion Books ISBN 978 1 78914 336 2 OCLC 1223025640 External links nbsp Wikiquote has quotations related to Turtles nbsp Wikimedia Commons has media related to Turtles nbsp The Wikibook Animal Care has a page on the topic of Turtle Turtle Survival Alliance Turtle Conservancy Symposium on Turtle Evolution Retrieved from https en wikipedia org w index php title Turtle amp oldid 1176269716, wikipedia, wiki, book, books, library,

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