The genus only has a single species P. spinodorsalis. It was first described by the paleontologist Rod S. Taylor in 2002. Its generic name is derived from Latinpaulus ("small") and terminus ("end"). The specific name is from Latin spina ("thorn") and dorsalis ("of the back").[1]
Descriptionedit
The ovoid-shaped bivalved carapace encloses the head and the anterior section of the trunk. The carapace is slightly less than twice as long as it is tall, and becomes wider posteriorly. The largest known carapace is 49.5 millimetres (1.95 in) long and 30 millimetres (1.2 in) wide, while in the smallest known specimens it is less than a centimere in length. The head is poorly known, though it is suggested that they lacked eyes. One specimen has partially preserved pair of segmented antennae, which have at least 4 segments, which decrease in length towards the end of the antenna. The thorax was likely tube shaped, and had six segments, each associated with a pair of biramous limbs, which decrease in size posteriorly. The limb endopods are thin and annulate, and approximately 1mm in width, while the exopods were lobe-shaped and bore setae. The abdomen was limbless and had five segments, and terminated in a pair of segmented caudal flukes.[1]
Taxonomyedit
In its original description, Pauloterminus was noted to be morphologically similar to Waptia and Chuandianella, both historically considered "waptiids", but it is unclear whether the group is monophyletic.[1]
Referencesedit
^ abcdRod S. Taylor (2002). "A new bivalved arthropod from the Early Cambrian Sirius Passet fauna, North Greenland". Palaeontology. 45 (Part 1). The Palaeontological Association: 97–123. doi:10.1111/1475-4983.00229.
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pauloterminus, extinct, genus, bivalved, arthropod, known, from, early, cambrian, about, million, years, sirius, passet, locality, northern, greenland, tentatively, classified, under, family, waptiidae, temporal, range, atdabanian, preꞒ, fossil, spinodorsalis,. Pauloterminus is an extinct genus of bivalved arthropod known from Early Cambrian about 520 to 516 million years ago Sirius Passet locality of northern Greenland It is tentatively classified under the family Waptiidae 1 PauloterminusTemporal range Atdabanian PreꞒ Ꞓ O S D C P T J K Pg N Fossil of P spinodorsalis Life restoration Scientific classification Domain Eukaryota Kingdom Animalia Phylum Arthropoda Order Hymenocarina Family Waptiidae Genus PauloterminusTaylor 2002 Species P spinodorsalis Binomial name Pauloterminus spinodorsalisTaylor 2002 The genus only has a single species P spinodorsalis It was first described by the paleontologist Rod S Taylor in 2002 Its generic name is derived from Latin paulus small and terminus end The specific name is from Latin spina thorn and dorsalis of the back 1 Description editThe ovoid shaped bivalved carapace encloses the head and the anterior section of the trunk The carapace is slightly less than twice as long as it is tall and becomes wider posteriorly The largest known carapace is 49 5 millimetres 1 95 in long and 30 millimetres 1 2 in wide while in the smallest known specimens it is less than a centimere in length The head is poorly known though it is suggested that they lacked eyes One specimen has partially preserved pair of segmented antennae which have at least 4 segments which decrease in length towards the end of the antenna The thorax was likely tube shaped and had six segments each associated with a pair of biramous limbs which decrease in size posteriorly The limb endopods are thin and annulate and approximately 1mm in width while the exopods were lobe shaped and bore setae The abdomen was limbless and had five segments and terminated in a pair of segmented caudal flukes 1 Taxonomy editIn its original description Pauloterminus was noted to be morphologically similar to Waptia and Chuandianella both historically considered waptiids but it is unclear whether the group is monophyletic 1 References edit a b c d Rod S Taylor 2002 A new bivalved arthropod from the Early Cambrian Sirius Passet fauna North Greenland Palaeontology 45 Part 1 The Palaeontological Association 97 123 doi 10 1111 1475 4983 00229 nbsp This prehistoric arthropod related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Pauloterminus amp oldid 1193893739, wikipedia, wiki, book, books, library,
