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Inland taipan

The inland taipan (Oxyuranus microlepidotus), also commonly known as the western taipan, small-scaled snake, or fierce snake,[6] is a species of extremely venomous snake in the family Elapidae. The species is endemic to semiarid regions of central east Australia.[7] Aboriginal Australians living in those regions named the snake dandarabilla.[8][9] It was formally described by Frederick McCoy in 1879 and then by William John Macleay in 1882, but for the next 90 years, it was a mystery to the scientific community; no further specimens were found, and virtually nothing was added to the knowledge of this species until its rediscovery in 1972.[8][10]

Inland taipan
Oxyuranus microlepidotus at Australia Zoo
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Elapidae
Genus: Oxyuranus
Species:
O. microlepidotus
Binomial name
Oxyuranus microlepidotus
(F. McCoy, 1879)
General range of inland taipan (in red). The current, documented range of the species is more limited.[2][3][4]
Synonyms
  • Diemenia microlepidota
    F. McCoy, 1879
  • Diemenia ferox
    Macleay, 1882
  • Pseudechis microlepidotus / Pseudechis ferox
    Boulenger, 1896
  • Parademansia microlepidota
    — Kinghorn, 1955
  • Oxyuranus scutellatus microlepidotus
    Worrell, 1963
  • Oxyuranus microlepidotus
    Covacevich et al., 1981[5]

Based on the median lethal dose value in mice, the venom of the inland taipan is by far the most toxic of any snake – much more so than even that of sea snakes[11][12][13] – and it has the most toxic venom of any reptile when tested on human heart cell culture.[14][15][16] The inland taipan is a specialist hunter of mammals, so its venom is specially adapted to kill warm-blooded species.[17] One bite possesses enough lethality to kill more than an estimated 100 fully grown humans.[18] It is an extremely fast and agile snake that can strike instantly with extreme accuracy,[19] often striking multiple times in the same attack,[20] and it envenomates in almost every case.[21]

Although the most venomous and a capable striker, in contrast to the coastal taipan, which many experts cite as an extremely dangerous snake due to its behaviour when it encounters humans,[22][23][24] the inland taipan is usually quite a shy and reclusive snake, with a placid disposition,[25] and prefers to escape from trouble.[26] However, it will defend itself and strike if provoked,[27] mishandled,[28] or prevented from escaping.[29] Because it lives in such remote locations, the inland taipan seldom comes in contact with people;[30] therefore it is not considered the deadliest snake in the world overall, especially in terms of disposition and human deaths per year.[31] The word "fierce" from its alternative name describes its venom, not its temperament.[32]

Taxonomy edit

To the Aboriginal people from the place now called Goyder Lagoon in north-east South Australia, the inland taipan was called dandarabilla.[8][9]

The inland taipan was first described scientifically in 1879. Two specimens[10] of the fierce snake were discovered at the junction of the Murray and Darling Rivers in northwestern Victoria and described by Frederick McCoy, who called the species Diemenia microlepidota, or small-scaled brown snake. In 1882, a third specimen was found near Bourke, New South Wales, and William John Macleay described the same snake under the name Diemenia ferox (thinking it was a different species[33]).[5][7] No more specimens were collected until 1972.[8][10] In 1896, George Albert Boulenger classified both as belonging to the same genus, Pseudechis (black snakes), referring to them as Pseudechis microlepidotus and P. ferox.[5]

In 1956, relying only on published descriptions and notes,[33] James Roy Kinghorn regarded ferox as a synonym for microlepidotus and proposed the genus Parademansia. In 1963, Eric Worrell considered Parademansia microlepidotus and Oxyuranus scutellatus (coastal taipan, named simply "taipan" in those days) to be the same species.[5]

In September 1972, after receiving an unclassified snake head sample from a grazier from one of the Channel Country stations west of Windorah of the far southwest Queensland, herpetologists Jeanette Covacevich (then working for the Queensland Museum) and Charles Tanner travelled to the site and found 13 living specimens, and rediscovered the lost snake Parademansia microlepidotus.[10] In 1976, Covacevich and Wombey argued that Parademansia microlepidotus belongs to a distinct genus, and this was also the opinion of Harold Cogger.[5]

Covacevich, McDowell, Tanner & Mengden (1981) successfully argued, by comparing anatomical features, chromosomes, and behaviours of the two species then known as Oxyuranus scutellatus (taipan) and Parademansia microlepidota, that they belonged in a single genus. Oxyuranus (1923), the more senior name, was adopted for the combined genus.[34]

Oxyuranus microlepidotus has been the fierce snake's binomial name since the early 1980s.[34][35] The generic name Oxyuranus is from Greek oxys "sharp, needle-like", and ouranos "an arch" (specifically the arch of the heavens) and refers to the needle-like anterior process on the arch of the palate.[36] The specific name microlepidotus means "small-scaled" (Latin). Hence the common name, "small-scaled snake".[37] Since Covacevich et al., 1981, determined that the fierce snake (formerly: Parademansia microlepidota) is actually part of the genus Oxyuranus (taipan), another species, Oxyuranus scutellatus, which was previously known simply as the "taipan" (coined from the aboriginal snake's name dhayban), was renamed the "coastal taipan" (or "eastern taipan"), while the now newly classified Oxyuranus microlepidotus became commonly known as the "inland taipan" (or "western taipan").[10]

Distribution and habitat edit

The inland taipan inhabits the black soil plains in the semiarid regions where the Queensland and South Australia borders converge.[7][38]

In Queensland, the snake has been observed in Channel Country region[39] (e.g., Diamantina National Park, Durrie Station, Morney Plains Station[40] and Astrebla Downs National Park[41]) and in South Australia it has been observed in the Marree-Innamincka NRM District[42][43] (e.g., Goyder Lagoon[44] Tirari Desert, Sturt Stony Desert, Coongie Lakes, Innamincka Regional Reserve and Oodnadatta[45]). An isolated population also occurs near Coober Pedy, South Australia.[2][3][46]

Two old records exist for localities further south-east, i.e., the junction of the Murray and Darling Rivers in northwestern Victoria (1879) and Bourke, New South Wales (1882), but the species has not been observed in either state since then.[2][7]

Conservation status edit

Like every Australian snake, the inland taipan is protected by law.[30]

Conservation status for the snake was assessed for the IUCN Red List for the first time in July 2017, and in 2018, was designated as least concern, stating, "This species is listed as least concern, as it is widespread and overall, it is not considered to be declining. Although the impact of potential threats requires further research, these are likely to be localized within the snake's range."[1]

The inland taipan's conservation status has also been designated by Australian official sources:[47]

  • South Australia: (Outback regional status) - least concern[45]
  • Queensland: Rare (before 2010), near threatened (May 2010-December 2014), least concern (December 2014 – present)[48][49]
  • New South Wales: Presumed extinct, because it "hasn't been recorded in its habitat...despite surveys in a time frame appropriate to their life cycle and type"[32][50]
  • Victoria: Regionally extinct, based on the criterion: "As for Extinct but within a defined region (in this case the state of Victoria) that does not encompass the entire geographic range of the taxon. A taxon is presumed Regionally Extinct when exhaustive surveys in known and/or expected habitat, at appropriate ), throughout the region have failed to record an individual. Surveys should be over a time frame appropriate to the taxon’s life cycle and life form."[51] The Australian Museum lists it as presumed extinct.[7]

In captivity edit

According to the International Species Information System (retrieved 2004), inland taipans are held in three zoo collections: Adelaide Zoo and Sydney Taronga Zoo in Australia and Moscow Zoo in Russia.[52] In the Moscow Zoo they are kept in the "House of Reptiles" which is not usually open to the general public.[53][54]

The inland taipan is also on public display in Australia at the Australia Zoo,[55] Australian Reptile Park,[56] Billabong Sanctuary,[30] Cairns Tropical Zoo,[57] Lone Pine Koala Sanctuary[58] and Shoalhaven Zoo.[59]

The snake is also on display at several locations outside of Australia:

In the United States, inland taipans are held at the Reptile Gardens in South Dakota,[60] at Kentucky Reptile Zoo[61] and at Animal World & Snake Farm Zoo in Texas.[62][63][64]

In Europe, inland taipans are held in Sweden at the Stockholm Skansen Zoo and Gothenburg Universeum[65][66] and in the UK at the London Zoo.[67] Amateur zoo listings also report the snake in tropicarium park Jesolo Italy, in Gifttierhaus Eimsheim, Welt der Gifte Greifswald, and TerraZoo Rheinberg Germany, in Lausanne vivarium Lausanne Switzerland, in Randers Tropical Zoo Denmark, in Plzeň Zoo Czech Republic and in Reptilienzoo Nockalm Patergassen Austria.[68][69]

In Asia, inland taipans are held in the Singapore Zoo.[70]

Private ownership law edit

In New South Wales, private ownership of an inland taipan is legal only with the highest class of venomous reptile licence.[71]

Description edit

 
Brown-coloured (winter)
 
Olive-coloured (summer)

The inland taipan is dark tan, ranging from a rich, dark hue to a brownish light green, depending on the season. Its back, sides, and tail may be different shades of brown and grey, with many scales having a wide, blackish edge. These dark-marked scales occur in diagonal rows so that the marks align to form broken chevrons of variable length that are inclined backward and downward. The lowermost lateral scales often have an anterior yellow edge. The dorsal scales are smooth and without keels. The round-snouted head and neck are usually noticeably darker than the body (glossy black in winter; dark brown in summer), the darker colour allowing the snake to heat itself while exposing only a smaller portion of the body at the burrow entrance. The eyes are of average size with blackish-brown irises and without a noticeable coloured rim around the pupils.

It has 23 rows of dorsal scales at midbody, between 55 and 70 divided subcaudal scales, and one anal scale.

The inland taipan averages about 1.8 m (5.9 ft) in total length, although larger specimens can reach total lengths of 2.5 m (8.2 ft).[72] Its fangs are between 3.5 and 6.2 mm long (shorter than those of the coastal taipan).[30]

Seasonal adaptation edit

Inland taipans adapt to their environments by changing the colour of their skin during seasonal changes. They tend to become lighter during the summer and darker during the winter. This seasonal colour change facilitates thermoregulation, allowing the snake to absorb more radiant heat in the colder months.

Breeding edit

Inland taipans produce clutches of one to two dozen eggs. The eggs hatch in about two months. They are usually laid in abandoned animal burrows and deep crevices. Reproduction rate depend in part on their diet: if not enough food is available, then the snake reproduces less.

Captive snakes generally live for 10 to 15 years. An inland taipan at the Australia Zoo lived to be over 20 years old.[30]

Feeding edit

In the wild, the inland taipan consumes only mammals,[73][74] mostly rodents, such as the long-haired rat (Rattus villosissimus), the plains rat (Pseudomys australis), the introduced house mouse (Mus musculus), and other dasyurids. In captivity, it may also eat day-old chicks.[7] Unlike other venomous snakes that strike with a single, accurate bite then retreat while waiting for the prey to die, the fierce snake subdues the prey with a series of rapid, accurate strikes. It is known to deliver up to eight venomous bites in a single attack,[7][32] often snapping its jaws fiercely several times to inflict multiple punctures in the same attack.[20] Its more risky attack strategy entails holding its prey with its body and biting it repeatedly. This injects the extremely toxic venom deep into the prey. The venom acts so rapidly that its prey does not have time to fight back.[75]

Natural threats edit

The mulga snake (Pseudechis australis) is immune to most Australian snake venom, and is known to also eat young inland taipans.[76] The perentie (Varanus giganteus), a large monitor lizard, shares the same habitat. As it grows large enough, it readily tackles large venomous snakes as prey.[77]

Interaction with humans edit

Many reptile keepers consider it a placid snake to handle.[7]

Inland taipans are rarely encountered in the wild by the average person because of their remoteness and brief above-ground appearance during the day. So long as a person is not creating much vibration and noise, the inland taipan may not feel alarmed or bothered by a human presence.[78][79][80] However, caution should be exercised and a safe distance maintained as it can inflict a potentially fatal bite. The inland taipan will defend itself and strike if provoked,[27] mishandled,[28] or prevented from escaping.[29] Firstly, but not always, it makes a threat display by raising its forebody in a tight low S-shaped curve with its head facing the threat. Should the person choose to ignore the warning, the inland taipan will strike.[7][29][81] It is an extremely fast and agile snake that can strike instantly with extreme accuracy,[29][82] and it envenoms in almost every case.[21]

Clinical toxicologist, venom researcher, herpetologist, and family physician Scott A. Weinstein[83] et al. have stated in Toxicon journal (October 2017) "There have been 11 previously well-documented envenomings by O. microlepidotus, but only 2 were inflicted by wild snakes. When clinically indicated, prompt provision of adequate antivenom is the cornerstone of managing O. microlepidotus envenoming. Rapid application of pressure-bandage immobilization and efficient retrieval of victims envenomed in remote locales, preferably by medically well-equipped aircraft, probably improves the likelihood of a positive outcome."[84]

Snakebite victims edit

A case of survival without antivenom was recorded in 1967; on 15 September, a tour guide was bitten while trying to capture a snake for a tour group in the Channel Country. He was conveyed to Broken Hill Hospital and then to Queen Elizabeth Hospital in Adelaide, but was not given antivenom, as he reported he was severely allergic to horse serum and believed he had been bitten by a brown snake. He spent four weeks in the hospital overall; his condition was likened to severe myasthenia gravis. Meanwhile, the snake had been sent to Eric Worrell, who confirmed it had been a coastal taipan.[85] After its rediscovery in 1972, it was identified as an inland taipan.[10]

In 1984, Australian toxicologist Peter Mirtschin was bitten by a 3-week-old inland taipan. He was the first to be treated with Taipan antivenom.[86]

In September 2012, in the small city of Kurri Kurri, New South Wales, north of Sydney, more than 1000 km away from the snake's natural environment, a teenaged boy was bitten on the finger by an inland taipan. The teenager's rapid self-application of a compression bandage above the wound[87] and the availability and administration of a polyvalent (broad-spectrum) antivenom in the local hospital saved his life. The police worked to find out how the inland taipan got to this part of Australia. The snake was most likely a stolen or illegal pet and the boy had tried to feed it.[88][89]

In December 2013, reptile handler Scott Grant (age 40+), who was conducting a demonstration in front of 300 people at the annual building union's picnic in Portland, Victoria, had just finished showing the crowd an inland taipan and was trying to put it into a bag when it struck him. He got into his utility and tied a bandage around his arm. A few minutes later, however, he was lying on the ground and convulsing. He was flown in a serious condition to Essendon Airport and driven to the Royal Melbourne Hospital, where his condition was stabilised, and over time, he recovered. Only a tiny amount of venom from the inland taipan had entered his body, and the adverse reaction he felt shortly after was an allergic one, presumably due to his past snake bites.[90][91][92][93]

In October 2017, Weinstein et al. published a case report in Toxicon, writing, "The victim was seeking to observe members of an isolated population of this species and was envenomed while attempting to photograph an approximately 1.5 m specimen. He reported feeling “drowsiness” and blurred vision that progressed to ptosis; he later developed dysphagia and dysarthria. The patient was treated with one vial of polyvalent antivenom, which was later followed by an additional two vials of taipan monovalent. He was intubated during retrieval, and recovered after 3 days of intensive care. He had a right ophthalmoplegia that persisted for approximately 1 week post-envenoming.".[84]

According to Rob Bredl, "the Barefoot Bushman", in an isolated area of South Australia, his father, Joe Bredl, was bitten while catching an inland taipan and barely survived. A more recent victim was his friend John Robinson, bitten while cleaning an inland taipan's cage at his reptile display on the Sunshine Coast, Queensland. He weathered the bite without antivenom, but sustained considerable muscle damage, as well as heart damage.[94]

Almost all positively identified inland taipan bite victims have been herpetologists handling the snakes for study or snake handlers, such as people who catch snakes to extract their venom, or keepers in wildlife parks. All were treated successfully with antivenom. No recorded incidents have been fatal since the advent of monovalent (specific) antivenom therapy,[6][30][95] though weeks are needed to recover from such a severe bite.[37][96]

Venom edit

The average quantity of venom delivered by this species is 44 mg, and the maximum dose recorded is 110 mg, compared to the Indian cobra (Naja naja) 169 mg/max 610 mg, and the North American eastern diamondback rattlesnake (Crotalus adamanteus) 410 mg/max 848 mg.[97]

The median lethal dose (LD50), subcutaneous (the most applicable to actual bites) for mice is 0.025 mg/kg[6][97] (0.01 mg/kg subcutaneous, in bovine serum albumin).[6][98] Compared to the beaked sea snake (Enhydrina schistosa) 0.164 mg/kg, Indian cobra 0.565 mg/kg, North American eastern diamondback rattlesnake 11.4 mg/kg,[97] the inland taipan has a smaller venom yield than its cousin the coastal taipan yet its venom is almost four times as toxic.[31][99] One bite's worth of venom is enough to kill 100 fully grown men.

Intravenous, intraperitoneal, and intramuscular LD50s for the inland taipan venom have not been tested.[100]

Belcher's sea snake (Hydrophis belcheri), which many times is mistakenly called the hook-nosed sea snake (Enhydrina schistosa), has been erroneously popularized as the most venomous snake in the world, due to Ernst and Zug's published book Snakes in Question: The Smithsonian Answer Book from 1996. Bryan Grieg Fry, a prominent venom expert, has clarified the error: "The hook-nosed myth was due to a fundamental error in a book called Snakes in Question. In there, all the toxicity testing results were lumped in together, regardless of the mode of testing (e.g. subcutaneous vs. intramuscular vs. intravenous vs. intraperitoneal). As the mode can influence the relative number, venoms can only be compared within a mode. Otherwise, it's apples and rocks."[13] Belcher's sea snake's actual LD50 (recorded only intramuscularly) is 0.24 mg/kg[101] and 0.155 mg/kg,[100] less lethal than other sea snakes such as the olive sea snake (Aipysurus laevis) 0.09 mg/kg and the most toxic intramuscularly, recorded of the sea snakes – the black-banded robust sea snake (Hydrophis melanosoma) 0.082 mg/kg. The black-banded robust sea snake has also been tested subcutaneously registering at 0.111 mg/kg, which is in line with the coastal taipan and thus more than four times less toxic than the inland taipan's venom. In the LD50 subcutaneous test, it is actually Dubois' sea snake (Aipysurus duboisii) which has the most toxic venom of any of the sea snakes tested, registering at 0.044 mg/kg. This is still nearly half as lethal as the inland taipan's venom.[100]

The biological properties and toxicity of a baby inland taipan's venom are not significantly different from or weaker than those of an adult's.[76][102]

The inland taipan's venom consists of:[81]

Paradoxin (PDX) appears to be one of the most potent, if not the most potent, beta-neurotoxins yet discovered. Beta-neurotoxins keep nerve endings from liberating the neurotransmitter acetylcholine.[98]

According to researcher Ronelle Welton of James Cook University, most of the contents in the venom have not been characterized and little molecular research has been undertaken on taipan (Oxyuranus) species at large. As of 2005, the amino acid sequences of only seven proteins from inland taipan have been submitted to SWISS-PROT databases.[37]

Clinical effects edit

The mortality rate is high in untreated cases:[106]

  • Dangerousness of bite - severe envenomation likely, high lethality potential
  • Rate of envenoming - >80%
  • Untreated lethality rate - >80%[81]

Clinically, envenomation may represent a complex scenario of multiple organ-system poisoning, with neurotoxic symptoms typically dominating. Acute kidney injury, rhabdomyolysis, and disseminated coagulopathy may also complicate the setting.[82]

The first local and general symptoms of a bite are local pain and variable nonspecific effects, which may include headache, nausea, vomiting, abdominal pain, diarrhoea, dizziness, collapse, or convulsions leading to major organ effects - neurotoxicity, coagulopathy, rhabdomyolysis or kidney failure/damage, and finally death.[81][106]

Inland taipan snake venom contains potent presynaptic neurotoxins (toxins in venom that cause paralysis or muscle weakness). Also present are postsynaptic neurotoxins, which are less potent, but more rapidly acting than the presynaptic neurotoxins.[107] Presynaptic neurotoxins disrupt neurotransmitter release from the axon terminal. This takes days to resolve and does not respond to antivenom. Postsynaptic neurotoxins competitively block acetylcholine receptors, but the effect can be reversed by antivenom. Envenoming causes a progressive descending flaccid paralysis; ptosis is usually the first sign, then facial (dysarthria) and bulbar involvement occur, progressing to dyspnea and respiratory paralysis leading to suffocation and peripheral weakness.[37][106] Because it can act so fast, it can kill a person within about 45 minutes. People experiencing effects of the venom within half an hour have been reported.[108][96] The development of general or respiratory paralysis is of paramount concern in that these are often difficult to reverse once established, even with large amounts of antivenom. Prolonged intubation and ventilatory support (perhaps up to a week or longer) may be required. Early diagnosis of neurotoxic symptoms and prompt and adequate dosages of antivenom are critical to avoid these complications.[82]

The venom also contains a potent hemotoxin (procoagulants), a prothrombin activator that leads to the consumption of major coagulation factors, including fibrinogen, leading to interference with blood clotting. This causes defibrination, with nonclottable blood, putting victims at risk of major bleeding from the bite site and can lead to more serious, sometimes fatal, internal haemorrhaging, especially in the brain. Recovering from this takes many hours after venom neutralisation has been achieved with antivenom.[106] Taipan snake procoagulants are among the most powerful snake venom procoagulants known,[107] though mild coagulopathy has also been reported for inland taipan envenomation (Sutherland and Tibballs, 2001).[37]

No nephrotoxins (kidney toxins) have so far been isolated from inland taipan snake venoms, but renal (kidney) impairment or acute kidney failure can occur secondary to severe rhabdomyolysis.[106]

Taipan snake venom does contain myotoxins that cause myolysis (rhabdomyolysis, muscle damage);[107] the urine of bite victims often turns reddish-brown as their muscles release myoglobin, which is passed through the kidneys (myoglobinuria). The kidneys are often badly damaged by filtering so much tissue debris out of the blood, and kidney failure is a common complication in serious cases of significant envenoming.[109]

Causes of death:[6]

Antivenom edit

Until 1955, the only antivenom available for general distribution for Australian snakes was the monovalent (specific) tiger snake (Notechis) antivenom, which gave varying degrees of cross-protection against the bites of most other dangerous Australian snakes. Thereafter followed specific antivenom for other common snakes, among them the coastal taipan, and finally, a polyvalent (broad-spectrum) antivenom for the bites of any unidentified snake from Australia.

The coastal taipan antivenom, known as "taipan antivenom",[110] is effective against the inland taipan venom, as well, but it is not as effective in bite victims of the inland taipan as in those of the coastal taipan.[37]

Taipan antivenom is produced and manufactured by the Australian Reptile Park and the Commonwealth Serum Laboratories in Melbourne.[111]

References edit

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  2. ^ a b c Animals of Queensland. Western Taipan Oxyuranus microlepidotus. Queensland Museum. Retrieved 8 November 2013.
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  4. ^ Oxyuranus microlepidotus (McCoy, 1879) Western Taipan. Atlas of Living Australia. Retrieved 8 November 2013.
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    • Venom Immunochemistry, Pharmacology and Emergency Response (VIPER) Institute. Frequently Asked Questions -What is the most venomous snake? 2018-07-15 at the Wayback Machine. "Many experts answer that it is the Inland Taipan of Australia, because its drop-by-drop concentration of venom has great potency when measured by its ability to kill rodents". University of Arizona. Retrieved 14 October 2013.
    • Department of Wildlife Ecology and Conservation. Frequently Asked Questions About Venomous Snakes. "A comparative study found that the snake venom that is most toxic to mice (of the species tested) is that of the Inland Taipan (Oxyuranus microlepidotus), found in Australia". University of Florida. Retrieved 5 November 2013.
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    • Journal of Herpetology Vol.17 no.1 (1983) Ecology of Highly Venoumous Snakes: the Australian Genus Oxyuranus. "..the number of mouse LD50 doses per bite is much higher for Oxyuranus microlepidotus (218,000 mice)...than for any other snakes, including sea snakes, investigated to date (Broad, Sutherland and Coulter, 1979)." (page 1) University of Sydney. Retrieved 8 November 2013.
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  13. ^ a b Inland Taipan Venom vs. Sea Snakes Venom (most notable Belcher's sea snake)
    • Oakley, Cecily (2011). Interview with Associate Professor Bryan Fry Biochemist and molecular biologist 2013-10-22 at the Wayback Machine. "...For my PhD, I worked on the inland taipan, which is the world's most venomous snake...". Australian Academy of Science. Retrieved 14 October 2013.
    • Fry, Brian site admin (10 April 2005) Most Venomous 2014-10-17 at the Wayback Machine, Question: " ...I was talking to another herpatolagist and he said the hook nosed sea snake was the most venomous of all" Fry Answers: "The hook nosed myth was due to a fundamental error in a book called 'Snakes in question'. In there, all the toxicity testing results were lumped in together, regardless of the mode of testing (e.g. subcutaneous vs. intramuscular vs intravenous vs intraperitoneal). As the mode can influence the relative number, venoms can only be compared within a mode. Otherwise, its apples and rocks." Venomdoc forums. Retrieved 25 February 2015.
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Further reading edit

  • Boulenger GA (1896). Catalogue of the Snakes in the British Museum (Natural History). Volume III., Containing the Colubridæ (Opisthoglyphæ and Proteroglyphæ),... London: Trustees of the British Museum. (Taylor and Francis, printers). xiv + 727 pp. + Plates I-XXV. (Pseudechis microlepidotus and P. ferox, p. 332).
  • McCoy F(1879). Natural History of Victoria. Prodromus of the Zoology of Victoria; or, Figures and Descriptions of the Living Species of All Classes of the Victorian Indigenous Animals. Decade III. London: G. Robertson. (J. Ferres, government printer, Melbourne). 50 pp. + Plates 21–30. (Diemenia microlepidota, new species, pp. 12–13 + Plate 23, Figures 2–3).

External links edit

  •   Data related to Oxyuranus microlepidotus at Wikispecies
  •   Media related to Oxyuranus microlepidotus at Wikimedia Commons
  • International Programme on Chemical Safety, Oxyuranus microlepidotus: Extended Review
  • James Cook University, Proteomic and genomic characterisation of venom proteins from Oxyuranus species (Extended Review)
  • Australia Zoo Fierce Snake Fact File
  • Animal Weapons: Episode 1 - Chemical Warfare on YouTube ContentMint (Source:Absolutely Wild Visuals, stock footage library 1 July 2015 at the Wayback Machine)

inland, taipan, inland, taipan, oxyuranus, microlepidotus, also, commonly, known, western, taipan, small, scaled, snake, fierce, snake, species, extremely, venomous, snake, family, elapidae, species, endemic, semiarid, regions, central, east, australia, aborig. The inland taipan Oxyuranus microlepidotus also commonly known as the western taipan small scaled snake or fierce snake 6 is a species of extremely venomous snake in the family Elapidae The species is endemic to semiarid regions of central east Australia 7 Aboriginal Australians living in those regions named the snake dandarabilla 8 9 It was formally described by Frederick McCoy in 1879 and then by William John Macleay in 1882 but for the next 90 years it was a mystery to the scientific community no further specimens were found and virtually nothing was added to the knowledge of this species until its rediscovery in 1972 8 10 Inland taipanOxyuranus microlepidotus at Australia ZooConservation statusLeast Concern IUCN 3 1 1 Scientific classificationDomain EukaryotaKingdom AnimaliaPhylum ChordataClass ReptiliaOrder SquamataSuborder SerpentesFamily ElapidaeGenus OxyuranusSpecies O microlepidotusBinomial nameOxyuranus microlepidotus F McCoy 1879 General range of inland taipan in red The current documented range of the species is more limited 2 3 4 SynonymsDiemenia microlepidotaF McCoy 1879 Diemenia feroxMacleay 1882 Pseudechis microlepidotus Pseudechis ferox Boulenger 1896 Parademansia microlepidota Kinghorn 1955 Oxyuranus scutellatus microlepidotus Worrell 1963 Oxyuranus microlepidotus Covacevich et al 1981 5 Based on the median lethal dose value in mice the venom of the inland taipan is by far the most toxic of any snake much more so than even that of sea snakes 11 12 13 and it has the most toxic venom of any reptile when tested on human heart cell culture 14 15 16 The inland taipan is a specialist hunter of mammals so its venom is specially adapted to kill warm blooded species 17 One bite possesses enough lethality to kill more than an estimated 100 fully grown humans 18 It is an extremely fast and agile snake that can strike instantly with extreme accuracy 19 often striking multiple times in the same attack 20 and it envenomates in almost every case 21 Although the most venomous and a capable striker in contrast to the coastal taipan which many experts cite as an extremely dangerous snake due to its behaviour when it encounters humans 22 23 24 the inland taipan is usually quite a shy and reclusive snake with a placid disposition 25 and prefers to escape from trouble 26 However it will defend itself and strike if provoked 27 mishandled 28 or prevented from escaping 29 Because it lives in such remote locations the inland taipan seldom comes in contact with people 30 therefore it is not considered the deadliest snake in the world overall especially in terms of disposition and human deaths per year 31 The word fierce from its alternative name describes its venom not its temperament 32 Contents 1 Taxonomy 2 Distribution and habitat 2 1 Conservation status 2 2 In captivity 2 2 1 Private ownership law 3 Description 3 1 Seasonal adaptation 4 Breeding 5 Feeding 6 Natural threats 7 Interaction with humans 7 1 Snakebite victims 8 Venom 8 1 Clinical effects 8 2 Antivenom 9 References 10 Further reading 11 External linksTaxonomy editTo the Aboriginal people from the place now called Goyder Lagoon in north east South Australia the inland taipan was called dandarabilla 8 9 The inland taipan was first described scientifically in 1879 Two specimens 10 of the fierce snake were discovered at the junction of the Murray and Darling Rivers in northwestern Victoria and described by Frederick McCoy who called the species Diemenia microlepidota or small scaled brown snake In 1882 a third specimen was found near Bourke New South Wales and William John Macleay described the same snake under the name Diemenia ferox thinking it was a different species 33 5 7 No more specimens were collected until 1972 8 10 In 1896 George Albert Boulenger classified both as belonging to the same genus Pseudechis black snakes referring to them as Pseudechis microlepidotus and P ferox 5 In 1956 relying only on published descriptions and notes 33 James Roy Kinghorn regarded ferox as a synonym for microlepidotus and proposed the genus Parademansia In 1963 Eric Worrell considered Parademansia microlepidotus and Oxyuranus scutellatus coastal taipan named simply taipan in those days to be the same species 5 In September 1972 after receiving an unclassified snake head sample from a grazier from one of the Channel Country stations west of Windorah of the far southwest Queensland herpetologists Jeanette Covacevich then working for the Queensland Museum and Charles Tanner travelled to the site and found 13 living specimens and rediscovered the lost snake Parademansia microlepidotus 10 In 1976 Covacevich and Wombey argued that Parademansia microlepidotus belongs to a distinct genus and this was also the opinion of Harold Cogger 5 Covacevich McDowell Tanner amp Mengden 1981 successfully argued by comparing anatomical features chromosomes and behaviours of the two species then known as Oxyuranus scutellatus taipan and Parademansia microlepidota that they belonged in a single genus Oxyuranus 1923 the more senior name was adopted for the combined genus 34 Oxyuranus microlepidotus has been the fierce snake s binomial name since the early 1980s 34 35 The generic name Oxyuranus is from Greek oxys sharp needle like and ouranos an arch specifically the arch of the heavens and refers to the needle like anterior process on the arch of the palate 36 The specific name microlepidotus means small scaled Latin Hence the common name small scaled snake 37 Since Covacevich et al 1981 determined that the fierce snake formerly Parademansia microlepidota is actually part of the genus Oxyuranus taipan another species Oxyuranus scutellatus which was previously known simply as the taipan coined from the aboriginal snake s name dhayban was renamed the coastal taipan or eastern taipan while the now newly classified Oxyuranus microlepidotus became commonly known as the inland taipan or western taipan 10 Distribution and habitat editThe inland taipan inhabits the black soil plains in the semiarid regions where the Queensland and South Australia borders converge 7 38 In Queensland the snake has been observed in Channel Country region 39 e g Diamantina National Park Durrie Station Morney Plains Station 40 and Astrebla Downs National Park 41 and in South Australia it has been observed in the Marree Innamincka NRM District 42 43 e g Goyder Lagoon 44 Tirari Desert Sturt Stony Desert Coongie Lakes Innamincka Regional Reserve and Oodnadatta 45 An isolated population also occurs near Coober Pedy South Australia 2 3 46 Two old records exist for localities further south east i e the junction of the Murray and Darling Rivers in northwestern Victoria 1879 and Bourke New South Wales 1882 but the species has not been observed in either state since then 2 7 Conservation status edit Like every Australian snake the inland taipan is protected by law 30 Conservation status for the snake was assessed for the IUCN Red List for the first time in July 2017 and in 2018 was designated as least concern stating This species is listed as least concern as it is widespread and overall it is not considered to be declining Although the impact of potential threats requires further research these are likely to be localized within the snake s range 1 The inland taipan s conservation status has also been designated by Australian official sources 47 South Australia Outback regional status least concern 45 Queensland Rare before 2010 near threatened May 2010 December 2014 least concern December 2014 present 48 49 New South Wales Presumed extinct because it hasn t been recorded in its habitat despite surveys in a time frame appropriate to their life cycle and type 32 50 Victoria Regionally extinct based on the criterion As for Extinct but within a defined region in this case the state of Victoria that does not encompass the entire geographic range of the taxon A taxon is presumed Regionally Extinct when exhaustive surveys in known and or expected habitat at appropriate throughout the region have failed to record an individual Surveys should be over a time frame appropriate to the taxon s life cycle and life form 51 The Australian Museum lists it as presumed extinct 7 In captivity edit According to the International Species Information System retrieved 2004 inland taipans are held in three zoo collections Adelaide Zoo and Sydney Taronga Zoo in Australia and Moscow Zoo in Russia 52 In the Moscow Zoo they are kept in the House of Reptiles which is not usually open to the general public 53 54 The inland taipan is also on public display in Australia at the Australia Zoo 55 Australian Reptile Park 56 Billabong Sanctuary 30 Cairns Tropical Zoo 57 Lone Pine Koala Sanctuary 58 and Shoalhaven Zoo 59 The snake is also on display at several locations outside of Australia In the United States inland taipans are held at the Reptile Gardens in South Dakota 60 at Kentucky Reptile Zoo 61 and at Animal World amp Snake Farm Zoo in Texas 62 63 64 In Europe inland taipans are held in Sweden at the Stockholm Skansen Zoo and Gothenburg Universeum 65 66 and in the UK at the London Zoo 67 Amateur zoo listings also report the snake in tropicarium park Jesolo Italy in Gifttierhaus Eimsheim Welt der Gifte Greifswald and TerraZoo Rheinberg Germany in Lausanne vivarium Lausanne Switzerland in Randers Tropical Zoo Denmark in Plzen Zoo Czech Republic and in Reptilienzoo Nockalm Patergassen Austria 68 69 In Asia inland taipans are held in the Singapore Zoo 70 Private ownership law edit In New South Wales private ownership of an inland taipan is legal only with the highest class of venomous reptile licence 71 Description edit nbsp Brown coloured winter nbsp Olive coloured summer The inland taipan is dark tan ranging from a rich dark hue to a brownish light green depending on the season Its back sides and tail may be different shades of brown and grey with many scales having a wide blackish edge These dark marked scales occur in diagonal rows so that the marks align to form broken chevrons of variable length that are inclined backward and downward The lowermost lateral scales often have an anterior yellow edge The dorsal scales are smooth and without keels The round snouted head and neck are usually noticeably darker than the body glossy black in winter dark brown in summer the darker colour allowing the snake to heat itself while exposing only a smaller portion of the body at the burrow entrance The eyes are of average size with blackish brown irises and without a noticeable coloured rim around the pupils It has 23 rows of dorsal scales at midbody between 55 and 70 divided subcaudal scales and one anal scale The inland taipan averages about 1 8 m 5 9 ft in total length although larger specimens can reach total lengths of 2 5 m 8 2 ft 72 Its fangs are between 3 5 and 6 2 mm long shorter than those of the coastal taipan 30 Seasonal adaptation edit Inland taipans adapt to their environments by changing the colour of their skin during seasonal changes They tend to become lighter during the summer and darker during the winter This seasonal colour change facilitates thermoregulation allowing the snake to absorb more radiant heat in the colder months Breeding editInland taipans produce clutches of one to two dozen eggs The eggs hatch in about two months They are usually laid in abandoned animal burrows and deep crevices Reproduction rate depend in part on their diet if not enough food is available then the snake reproduces less Captive snakes generally live for 10 to 15 years An inland taipan at the Australia Zoo lived to be over 20 years old 30 Feeding editIn the wild the inland taipan consumes only mammals 73 74 mostly rodents such as the long haired rat Rattus villosissimus the plains rat Pseudomys australis the introduced house mouse Mus musculus and other dasyurids In captivity it may also eat day old chicks 7 Unlike other venomous snakes that strike with a single accurate bite then retreat while waiting for the prey to die the fierce snake subdues the prey with a series of rapid accurate strikes It is known to deliver up to eight venomous bites in a single attack 7 32 often snapping its jaws fiercely several times to inflict multiple punctures in the same attack 20 Its more risky attack strategy entails holding its prey with its body and biting it repeatedly This injects the extremely toxic venom deep into the prey The venom acts so rapidly that its prey does not have time to fight back 75 Natural threats editThe mulga snake Pseudechis australis is immune to most Australian snake venom and is known to also eat young inland taipans 76 The perentie Varanus giganteus a large monitor lizard shares the same habitat As it grows large enough it readily tackles large venomous snakes as prey 77 Interaction with humans editMany reptile keepers consider it a placid snake to handle 7 Inland taipans are rarely encountered in the wild by the average person because of their remoteness and brief above ground appearance during the day So long as a person is not creating much vibration and noise the inland taipan may not feel alarmed or bothered by a human presence 78 79 80 However caution should be exercised and a safe distance maintained as it can inflict a potentially fatal bite The inland taipan will defend itself and strike if provoked 27 mishandled 28 or prevented from escaping 29 Firstly but not always it makes a threat display by raising its forebody in a tight low S shaped curve with its head facing the threat Should the person choose to ignore the warning the inland taipan will strike 7 29 81 It is an extremely fast and agile snake that can strike instantly with extreme accuracy 29 82 and it envenoms in almost every case 21 Clinical toxicologist venom researcher herpetologist and family physician Scott A Weinstein 83 et al have stated in Toxicon journal October 2017 There have been 11 previously well documented envenomings by O microlepidotus but only 2 were inflicted by wild snakes When clinically indicated prompt provision of adequate antivenom is the cornerstone of managing O microlepidotus envenoming Rapid application of pressure bandage immobilization and efficient retrieval of victims envenomed in remote locales preferably by medically well equipped aircraft probably improves the likelihood of a positive outcome 84 Snakebite victims edit A case of survival without antivenom was recorded in 1967 on 15 September a tour guide was bitten while trying to capture a snake for a tour group in the Channel Country He was conveyed to Broken Hill Hospital and then to Queen Elizabeth Hospital in Adelaide but was not given antivenom as he reported he was severely allergic to horse serum and believed he had been bitten by a brown snake He spent four weeks in the hospital overall his condition was likened to severe myasthenia gravis Meanwhile the snake had been sent to Eric Worrell who confirmed it had been a coastal taipan 85 After its rediscovery in 1972 it was identified as an inland taipan 10 In 1984 Australian toxicologist Peter Mirtschin was bitten by a 3 week old inland taipan He was the first to be treated with Taipan antivenom 86 In September 2012 in the small city of Kurri Kurri New South Wales north of Sydney more than 1000 km away from the snake s natural environment a teenaged boy was bitten on the finger by an inland taipan The teenager s rapid self application of a compression bandage above the wound 87 and the availability and administration of a polyvalent broad spectrum antivenom in the local hospital saved his life The police worked to find out how the inland taipan got to this part of Australia The snake was most likely a stolen or illegal pet and the boy had tried to feed it 88 89 In December 2013 reptile handler Scott Grant age 40 who was conducting a demonstration in front of 300 people at the annual building union s picnic in Portland Victoria had just finished showing the crowd an inland taipan and was trying to put it into a bag when it struck him He got into his utility and tied a bandage around his arm A few minutes later however he was lying on the ground and convulsing He was flown in a serious condition to Essendon Airport and driven to the Royal Melbourne Hospital where his condition was stabilised and over time he recovered Only a tiny amount of venom from the inland taipan had entered his body and the adverse reaction he felt shortly after was an allergic one presumably due to his past snake bites 90 91 92 93 In October 2017 Weinstein et al published a case report in Toxicon writing The victim was seeking to observe members of an isolated population of this species and was envenomed while attempting to photograph an approximately 1 5 m specimen He reported feeling drowsiness and blurred vision that progressed to ptosis he later developed dysphagia and dysarthria The patient was treated with one vial of polyvalent antivenom which was later followed by an additional two vials of taipan monovalent He was intubated during retrieval and recovered after 3 days of intensive care He had a right ophthalmoplegia that persisted for approximately 1 week post envenoming 84 According to Rob Bredl the Barefoot Bushman in an isolated area of South Australia his father Joe Bredl was bitten while catching an inland taipan and barely survived A more recent victim was his friend John Robinson bitten while cleaning an inland taipan s cage at his reptile display on the Sunshine Coast Queensland He weathered the bite without antivenom but sustained considerable muscle damage as well as heart damage 94 Almost all positively identified inland taipan bite victims have been herpetologists handling the snakes for study or snake handlers such as people who catch snakes to extract their venom or keepers in wildlife parks All were treated successfully with antivenom No recorded incidents have been fatal since the advent of monovalent specific antivenom therapy 6 30 95 though weeks are needed to recover from such a severe bite 37 96 Venom editThe average quantity of venom delivered by this species is 44 mg and the maximum dose recorded is 110 mg compared to the Indian cobra Naja naja 169 mg max 610 mg and the North American eastern diamondback rattlesnake Crotalus adamanteus 410 mg max 848 mg 97 The median lethal dose LD50 subcutaneous the most applicable to actual bites for mice is 0 025 mg kg 6 97 0 01 mg kg subcutaneous in bovine serum albumin 6 98 Compared to the beaked sea snake Enhydrina schistosa 0 164 mg kg Indian cobra 0 565 mg kg North American eastern diamondback rattlesnake 11 4 mg kg 97 the inland taipan has a smaller venom yield than its cousin the coastal taipan yet its venom is almost four times as toxic 31 99 One bite s worth of venom is enough to kill 100 fully grown men Intravenous intraperitoneal and intramuscular LD50s for the inland taipan venom have not been tested 100 Belcher s sea snake Hydrophis belcheri which many times is mistakenly called the hook nosed sea snake Enhydrina schistosa has been erroneously popularized as the most venomous snake in the world due to Ernst and Zug s published book Snakes in Question The Smithsonian Answer Book from 1996 Bryan Grieg Fry a prominent venom expert has clarified the error The hook nosed myth was due to a fundamental error in a book called Snakes in Question In there all the toxicity testing results were lumped in together regardless of the mode of testing e g subcutaneous vs intramuscular vs intravenous vs intraperitoneal As the mode can influence the relative number venoms can only be compared within a mode Otherwise it s apples and rocks 13 Belcher s sea snake s actual LD50 recorded only intramuscularly is 0 24 mg kg 101 and 0 155 mg kg 100 less lethal than other sea snakes such as the olive sea snake Aipysurus laevis 0 09 mg kg and the most toxic intramuscularly recorded of the sea snakes the black banded robust sea snake Hydrophis melanosoma 0 082 mg kg The black banded robust sea snake has also been tested subcutaneously registering at 0 111 mg kg which is in line with the coastal taipan and thus more than four times less toxic than the inland taipan s venom In the LD50 subcutaneous test it is actually Dubois sea snake Aipysurus duboisii which has the most toxic venom of any of the sea snakes tested registering at 0 044 mg kg This is still nearly half as lethal as the inland taipan s venom 100 The biological properties and toxicity of a baby inland taipan s venom are not significantly different from or weaker than those of an adult s 76 102 The inland taipan s venom consists of 81 Neurotoxins Presynaptic neurotoxins paradoxin PDX 98 and postsynaptic neurotoxins 6 Oxylepitoxin 1 103 alpha oxytoxin 1 alpha scutoxin 1 104 affecting the nervous system Hemotoxins procoagulants affecting the blood Myotoxins affecting the muscles Possibly nephrotoxins affecting the kidneys Possibly haemorrhagins 105 affecting the blood vessels endothelium Hyaluronidase enzyme increases the rate of absorption of venom 7 Paradoxin PDX appears to be one of the most potent if not the most potent beta neurotoxins yet discovered Beta neurotoxins keep nerve endings from liberating the neurotransmitter acetylcholine 98 According to researcher Ronelle Welton of James Cook University most of the contents in the venom have not been characterized and little molecular research has been undertaken on taipan Oxyuranus species at large As of 2005 the amino acid sequences of only seven proteins from inland taipan have been submitted to SWISS PROT databases 37 Clinical effects edit The mortality rate is high in untreated cases 106 Dangerousness of bite severe envenomation likely high lethality potential Rate of envenoming gt 80 Untreated lethality rate gt 80 81 Clinically envenomation may represent a complex scenario of multiple organ system poisoning with neurotoxic symptoms typically dominating Acute kidney injury rhabdomyolysis and disseminated coagulopathy may also complicate the setting 82 The first local and general symptoms of a bite are local pain and variable nonspecific effects which may include headache nausea vomiting abdominal pain diarrhoea dizziness collapse or convulsions leading to major organ effects neurotoxicity coagulopathy rhabdomyolysis or kidney failure damage and finally death 81 106 Inland taipan snake venom contains potent presynaptic neurotoxins toxins in venom that cause paralysis or muscle weakness Also present are postsynaptic neurotoxins which are less potent but more rapidly acting than the presynaptic neurotoxins 107 Presynaptic neurotoxins disrupt neurotransmitter release from the axon terminal This takes days to resolve and does not respond to antivenom Postsynaptic neurotoxins competitively block acetylcholine receptors but the effect can be reversed by antivenom Envenoming causes a progressive descending flaccid paralysis ptosis is usually the first sign then facial dysarthria and bulbar involvement occur progressing to dyspnea and respiratory paralysis leading to suffocation and peripheral weakness 37 106 Because it can act so fast it can kill a person within about 45 minutes People experiencing effects of the venom within half an hour have been reported 108 96 The development of general or respiratory paralysis is of paramount concern in that these are often difficult to reverse once established even with large amounts of antivenom Prolonged intubation and ventilatory support perhaps up to a week or longer may be required Early diagnosis of neurotoxic symptoms and prompt and adequate dosages of antivenom are critical to avoid these complications 82 The venom also contains a potent hemotoxin procoagulants a prothrombin activator that leads to the consumption of major coagulation factors including fibrinogen leading to interference with blood clotting This causes defibrination with nonclottable blood putting victims at risk of major bleeding from the bite site and can lead to more serious sometimes fatal internal haemorrhaging especially in the brain Recovering from this takes many hours after venom neutralisation has been achieved with antivenom 106 Taipan snake procoagulants are among the most powerful snake venom procoagulants known 107 though mild coagulopathy has also been reported for inland taipan envenomation Sutherland and Tibballs 2001 37 No nephrotoxins kidney toxins have so far been isolated from inland taipan snake venoms but renal kidney impairment or acute kidney failure can occur secondary to severe rhabdomyolysis 106 Taipan snake venom does contain myotoxins that cause myolysis rhabdomyolysis muscle damage 107 the urine of bite victims often turns reddish brown as their muscles release myoglobin which is passed through the kidneys myoglobinuria The kidneys are often badly damaged by filtering so much tissue debris out of the blood and kidney failure is a common complication in serious cases of significant envenoming 109 Causes of death 6 Paralysis primary e g respiratory failure secondary e g pneumonia Coagulopathy primary e g cerebral haemorrhage secondary e g kidney failure Kidney failure includes secondary complications such as infections Anaphylaxis acute allergic reaction to venom in a patient previously exposed to taipan snake venom e g reptile keeper Cardiac complications likely to be secondaryAntivenom edit Until 1955 the only antivenom available for general distribution for Australian snakes was the monovalent specific tiger snake Notechis antivenom which gave varying degrees of cross protection against the bites of most other dangerous Australian snakes Thereafter followed specific antivenom for other common snakes among them the coastal taipan and finally a polyvalent broad spectrum antivenom for the bites of any unidentified snake from Australia The coastal taipan antivenom known as taipan antivenom 110 is effective against the inland taipan venom as well but it is not as effective in bite victims of the inland taipan as in those of the coastal taipan 37 Taipan antivenom is produced and manufactured by the Australian Reptile Park and the Commonwealth Serum Laboratories in Melbourne 111 References edit a b Wilson S Dickman C Hobson R Sanderson C 2018 Oxyuranus Scutellatus IUCN Red List of Threatened Species 2018 e T42493150A42493160 doi 10 2305 IUCN UK 2018 1 RLTS T42493150A42493160 en Retrieved 19 November 2021 a b c Animals of Queensland Western Taipan Oxyuranus microlepidotus Queensland Museum Retrieved 8 November 2013 a b Australian Reptile Online Database 28 March 2007 Inland taipan distribution arod com au Retrieved 8 November 2013 Oxyuranus microlepidotus McCoy 1879 Western Taipan Atlas of Living Australia Retrieved 8 November 2013 a b c d e Fohlman J 1979 Comparison of two highly toxic Australian snake venoms The taipan Oxyuranus s scutellatus and the fierce snake Parademansia microlepidotus Toxicon 17 2 170 2 doi 10 1016 0041 0101 79 90296 4 PMID 442105 a b c d e f White Julian November 1991 Oxyuranus microlepidotus Neurotoxic paralysis usually takes 2 4 hours to become clinically detectable Coagulopathy however may become well established within 30 minutes of a bite International Programme on Chemical Safety Retrieved 8 November 2013 a b c d e f g h i j Cecilie Beatson 29 November 2011 Animal Species Inland Taipan Australian Museum Retrieved 14 October 2013 a b c d Queensland Snakes History amp Discovery archived Queensland Museum Retrieved 15 November 2013 a b Pearn John Winkel Kenneth D December 2006 Toxinology in Australia s colonial era A chronology and perspective of human envenomation in 19th century Australia Toxicon 48 7 726 737 doi 10 1016 j toxicon 2006 07 027 PMID 16996551 a b c d e f Rediscovery The Rediscovery of the Western Taipan archived Queensland Museum Retrieved 15 November 2013 The Australian venom research unit 25 August 2007 Which snakes are the most venomous Archived 2014 06 26 at the Wayback Machine University of Melbourne Retrieved 14 October 2013 Venom Immunochemistry Pharmacology and Emergency Response VIPER Institute Frequently Asked Questions What is the most venomous snake Archived 2018 07 15 at the Wayback Machine Many experts answer that it is the Inland Taipan of Australia because its drop by drop concentration of venom has great potency when measured by its ability to kill rodents University of Arizona Retrieved 14 October 2013 Department of Wildlife Ecology and Conservation Frequently Asked Questions About Venomous Snakes A comparative study found that the snake venom that is most toxic to mice of the species tested is that of the Inland Taipan Oxyuranus microlepidotus found in Australia University of Florida Retrieved 5 November 2013 Hodgson WC Dal Belo CA Rowan EG 2007 The neuromuscular activity of paradoxin a presynaptic neurotoxin from the venom of the inland taipan Oxyuranus microlepidotus Neuropharmacology 52 5 1229 36 doi 10 1016 j neuropharm 2007 01 002 PMID 17313963 S2CID 19532337 The inland taipan is the world s most venomous snake Bell Karen L Sutherland Struan K Hodgson Wayne C 1998 Some pharmacological studies of venom from the inland taipan Oxyuranus microlepidotus Toxicon 36 1 63 74 doi 10 1016 S0041 0101 97 00060 3 PMID 9604283 The Inland Taipan is believed to have the most toxic venom in the world Sutherland 1994 Journal of Herpetology Vol 17 no 1 1983 Ecology of Highly Venoumous Snakes the Australian Genus Oxyuranus the number of mouse LD50 doses per bite is much higher for Oxyuranus microlepidotus 218 000 mice than for any other snakes including sea snakes investigated to date Broad Sutherland and Coulter 1979 page 1 University of Sydney Retrieved 8 November 2013 LISTS Nine of the World s Deadliest Snakes 1 The snake with the world s deadliest venom Oxyuranus microlepidotus Encyclopaedia Britannica Retrieved 5 November 2013 BBC Nature Wildlife Inland Taipan page Australia s inland taipan is considered to be the most venomous snake in the world BBC Retrieved 15 October 2013 Cecilie Beatson 29 November 2011 Animal Species Inland Taipan The venom of the Inland Taipan is extremely potent and is rated as the most toxic of all snake venoms in LD50 tests on mice Australian Museum Retrieved 14 October 2013 Steve Irwin presentation Australia Zoo Tour with Steve Irwin 1m54s the number 1 most venomous snake in the entire world the fierce snake Australia Zoo official Youtube Channel Retrieved 14 October 2013 a b Inland Taipan Venom vs Sea Snakes Venom most notable Belcher s sea snake Oakley Cecily 2011 Interview with Associate Professor Bryan Fry Biochemist and molecular biologist Archived 2013 10 22 at the Wayback Machine For my PhD I worked on the inland taipan which is the world s most venomous snake Australian Academy of Science Retrieved 14 October 2013 Fry Brian site admin 10 April 2005 Most Venomous Archived 2014 10 17 at the Wayback Machine Question I was talking to another herpatolagist and he said the hook nosed sea snake was the most venomous of all Fry Answers The hook nosed myth was due to a fundamental error in a book called Snakes in question In there all the toxicity testing results were lumped in together regardless of the mode of testing e g subcutaneous vs intramuscular vs intravenous vs intraperitoneal As the mode can influence the relative number venoms can only be compared within a mode Otherwise its apples and rocks Venomdoc forums Retrieved 25 February 2015 kingsnake com September Guest Chatter 16 September 2006 Q amp A with Dr Bryan Grieg Fry Deputy Director Australian Venom Research Unit University of Melbourne Archived 2012 10 15 at the Wayback Machine Q In retrospect to the LD50 charts what do you personally feel is the hottest snake in regards to potency defensiveness means of injection etc A It is the inland taipan Oxyuranus microlepidotus Not as is popularised any of the sea snakes connectedbypets com Retrieved 14 October 2013 Garden of Eden Exotics 2 May 2012 Dr Bryan Grieg Fry Interview The inland taipan Oxyuranus microlepidotus is far and away the most toxic much more so than even sea snakes nyexotics blogspot com Retrieved 14 October 2013 Fry Bryan Archived 2014 04 19 at the Wayback Machine 8 February 2005 Most Venomous Archived 2014 10 17 at the Wayback Machine Q I was wondering what snakes venom is the most potent to humans A Drop for drop it is the inland taipan Oxyuranus microlepidotus which has a venom more toxic than any other land snake or even the sea snakes venomdoc com Forums Retrieved 17 April 2014 Seymour Jamie World s Worst Venom Min 44 33 Among the reptiles tested the most toxic venom belongs to inland taipan killing over 60 of heart cells in the first 10 minutes National Geographic Channel Retrieved 17 April 2014 Seymour Jamie Venom Death Match They have the most toxic venom towards humans then any other snake in the world min 1 49 National Geographic Channel Retrieved 17 April 2014 Shorter Damon Great Australian bites Three of the worst Australian Broadcasting Corporation Retrieved 16 October 2013 Inland Taipan Oxyuranus microlepidotus venomsupplies com Retrieved 18 October 2013 Journal of Herpetology Vol 17 no 1 1983 Ecology of Highly Venoumous Snakes the Australian Genus Oxyuranus the number of mouse LD50 doses per bite is much higher for Oxyuranus microlepidotus 218 000 mice than for any other snakes including sea snakes investigated to date Broad Sutherland and Coulter 1979 page 1 University of Sydney Retrieved 8 November 2013 Reptiles Fierce Snake Archived 2014 02 27 at the Wayback Machine Australia Zoo Retrieved 14 October 2013 Martin Stella January 2004 Newsletter No 80 It has been calculated that there is enough venom in just one bite of an Inland taipan to kill more than 100 men of average size Environmental Protection Agency Queensland Retrieved 18 October 2013 News 28 September 2012 Meet the world s deadliest snake in safety Archived 2018 07 15 at the Wayback Machine Taronga Conservation Society Retrieved 23 September 2014 Carbone Nick reporting on Steve Irwin 4 September 2011 Remembering Steve Irwin The 5 Most Memorable Crocodile Hunter Videos Steve Irwin Plays with Inland Taipan Fierce Snake Time Retrieved 15 October 2013 29 November 2011 Snake Bite Raymond Hoser Official YouTube channel Retrieved 31 March 2014 Carbone Nick reporting on Steve Irwin 4 September 2011 Remembering Steve Irwin The 5 Most Memorable Crocodile Hunter Videos Steve Irwin Plays with Inland Taipan Fierce Snake Time Retrieved 15 October 2013 News 10 October 2013 Street s Corner Houdini Heir Tries To Escape World s Deadliest Snake KABB KABB Fox San Antonio official YouTube Channel Retrieved 11 November 2013 Clinical Toxinology Resources Snakebite Protocols Oxyuranus microlepidotus Signs and Symptoms of Envenomation E Fang Marks The snake strikes with extraordinary speed and accuracy often snapping its jaws fiercely several times which can result in multiple punctures in the same attack Special Considerations A Multiple Bites The Inland Taipan is an extremely fast and agile snake which can strike instantly with extreme accuracy It is possible for a Taipan to deliver more than one bite in a single attack University of Adelaide Retrieved 18 October 2013 a b Seymour Jamie Venom deathmatch The snake demonstrates striking multiple times min 1 49 National Geographic Channel Retrieved 17 April 2014 Cecilie Beatson 29 November 2011 Animal Species Inland Taipan Australian Museum Retrieved 14 October 2013 Clinical Toxinology Resources Snakebite Protocols Oxyuranus microlepidotus Signs and Symptoms of Envenomation E Fang Marks The snake strikes with extraordinary speed and accuracy often snapping its jaws fiercely several times which can result in multiple punctures in the same attack Special Considerations A Multiple Bites The Inland Taipan is an extremely fast and agile snake which can strike instantly with extreme accuracy It is possible for a Taipan to deliver more than one bite in a single attack University of Adelaide Retrieved 18 October 2013 a b ABC News 24 27 September 2012 Teen hospitalised after bite from deadly Taipan Quoting toxicologist Dr Geoff Isbister Australian Broadcasting Corporation Retrieved 13 November 2013 Haji R 2000 Venomous snakes and snake bites PDF Zoocheck Canada Archived from the original PDF on 25 April 2012 Retrieved 25 October 2013 Pitman Charles R S 1974 A Guide to the Snakes of Uganda United Kingdom Wheldon amp Wesley p 290 ISBN 978 0 85486 020 3 Coastal Taipan Queensland Museum Queensland Government Retrieved 21 October 2013 Cecilie Beatson 29 November 2011 Animal Species Inland Taipan The venom of the Inland Taipan is extremely potent and is rated as the most toxic of all snake venoms in LD50 tests on mice Australian Museum Retrieved 14 October 2013 South Australia Arid Lands Natural Resources Management Board Biodiversity studies Student fact sheet Archived 2012 03 22 at the Wayback Machine Government of South Australia Retrieved 15 October 2013 Clinical Toxinology Resources Oxyuranus microlepidotus General Details Taxonomy and Biology Venom Clinical Effects Treatment First Aid Antivenoms University of Adelaide Retrieved 14 October 2013 ABC News 24 28 September 2012 Placid taipan in safe hands Quoting licensed reptile handler Judith Judy Martin Australian Broadcasting Corporation Retrieved 13 November 2013 Carbone Nick reporting on Steve Irwin 4 September 2011 Remembering Steve Irwin The 5 Most Memorable Crocodile Hunter Videos Steve Irwin Plays with Inland Taipan Fierce Snake Time Retrieved 15 October 2013 Threatened species 10 October 2012 Fierce Snake profile Office of Environment and Heritage New South Wales Retrieved 15 October 2013 a b Cecilie Beatson 29 November 2011 Animal Species Inland Taipan The venom of the Inland Taipan is extremely potent and is rated as the most toxic of all snake venoms in LD50 tests on mice Australian Museum Retrieved 14 October 2013 News 10 October 2013 Street s Corner Houdini Heir Tries To Escape World s Deadliest Snake KABB KABB Fox San Antonio official YouTube Channel Retrieved 11 November 2013 Steve Backshall 19 May 2013 film clip The most venomous snake on earth Deadly 60 BBC BBC Earth official YouTube channel Retrieved 14 November 2013 a b ABC News 24 28 September 2012 Placid taipan in safe hands Quoting licensed reptile handler Judith Judy Martin Australian Broadcasting Corporation Retrieved 13 November 2013 29 November 2011 Snake Bite Raymond Hoser Official YouTube channel Retrieved 31 March 2014 a b c d Carbone Nick reporting on Steve Irwin 4 September 2011 Remembering Steve Irwin The 5 Most Memorable Crocodile Hunter Videos Steve Irwin Plays with Inland Taipan Fierce Snake Time Retrieved 15 October 2013 a b c d e f Aussie Animals Inland Taipan Oxyuranus microlepidotus Archived 2013 10 19 at the Wayback Machine Billabong Sanctuary Retrieved 18 October 2013 a b Venomous Snakes World s Deadliest Snakes Ranking scale Archived 8 May 2017 at the Wayback Machine Reptile Gardens Retrieved 18 October 2013 Walls Jerry G Deadly Snakes What are the world s most deadly venomous snakes Reptiles magazine Retrieved 5 November 2013 National Geographic Channel Dangerous Encounters with Brady Barr video clip Deadliest Snakes Inland Taipan in Deadliest Snakes Brady approaches seven of the world s most dangerous and venomous snakes to determine which snake is the deadliest He will scientifically investigate each species of snake by grading them on five basic criteria size volume and toxicity of venom personality and number of human deaths Reptile Gardens video host Retrieved 6 November 2013 a b c Threatened species 10 October 2012 Fierce Snake profile Office of Environment and Heritage New South Wales Retrieved 15 October 2013 a b Kinghorn J Roy 1 September 1955 Herpetological notes No 5 page 284 Australian Museum Scientific Publications Retrieved 14 November 2013 a b Two Taipans Two Taipans Coastal and Western archived Queensland Museum Retrieved 15 November 2013 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taipans NeuroToxicology 31 2 239 43 doi 10 1016 j neuro 2009 12 009 PMID 20036687 Clinical Toxinology Resources Haemorrhagins University of Adelaide Retrieved 18 October 2013 a b c d e Geoffrey K Isbister 2006 Snake bite a current approach to management Australian Prescriber Retrieved 14 October 2013 a b c Clinical Toxinology Resources Australian Taipan Snakes Venom of Taipan snakes University of Adelaide Retrieved 16 October 2013 Gardiner Stephanie 27 September 2012 Mystery over boy bitten by world s most venomous snake Quoting Julie Mendezona Head keeper of Reptiles and Spiders Australian Reptile Park The Sydney Morning Herald Retrieved 14 October 2013 Shorter Damon Great Australian bites Three of the worst Australian Broadcasting Corporation Retrieved 16 October 2013 Inland Taipan Oxyuranus microlepidotus venomsupplies com Retrieved 18 October 2013 Anti Venom Program Involvement with the Anti Venom Program Reptile Gardens Retrieved 18 October 2013 Further reading editBoulenger GA 1896 Catalogue of the Snakes in the British Museum Natural History Volume III Containing the Colubridae Opisthoglyphae and Proteroglyphae London Trustees of the British Museum Taylor and Francis printers xiv 727 pp Plates I XXV Pseudechis microlepidotus and P ferox p 332 McCoy F 1879 Natural History of Victoria Prodromus of the Zoology of Victoria or Figures and Descriptions of the Living Species of All Classes of the Victorian Indigenous Animals Decade III London G Robertson J Ferres government printer Melbourne 50 pp Plates 21 30 Diemenia microlepidota new species pp 12 13 Plate 23 Figures 2 3 External links edit nbsp Data related to Oxyuranus microlepidotus at Wikispecies nbsp Media related to Oxyuranus microlepidotus at Wikimedia Commons International Programme on Chemical Safety Oxyuranus microlepidotus Extended Review James Cook University Proteomic and genomic characterisation of venom proteins from Oxyuranus species Extended Review Australian Reptile Park Fierce Snake Fact File Australia Zoo Fierce Snake Fact File Animal Weapons Episode 1 Chemical Warfare on YouTube ContentMint Source Absolutely Wild Visuals stock footage library Archived 1 July 2015 at the Wayback Machine Retrieved from https en wikipedia org w index php title Inland taipan amp oldid 1186832069, wikipedia, wiki, book, books, library,

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