Sinaspideretes

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Sinaspideretes
Temporal range: Late Jurassic 161.2–155.7  Ma
Sinaspideretes wimani.JPG
Sinaspideretes wimani fossil displayed in Hong Kong Science Museum.
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Testudines
Suborder: Cryptodira
Clade: Polycryptodira
Superfamily: Trionychia
Genus: Sinaspideretes
Young and Chow, 1953
Species:
S. wimani
Binomial name
Sinaspideretes wimani
Young & Chow, 1953

Sinaspideretes is an extinct genus of turtle from the Late Jurassic of China, probably from the Shaximiao Formation. It is considered the earliest and most basal representative of the Trionychia, [1] [2] and is possibly the oldest known member of Cryptodira. [3] In 2013, it was proposed that this animal and the genus Yehguia are in fact one and the same. [4]

Related Research Articles

<span class="mw-page-title-main">Cryptodira</span> Suborder of reptiles

The Cryptodira are a suborder of Testudines that includes most living tortoises and turtles. Cryptodira differ from Pleurodira in that they lower their necks and pull the heads straight back into the shells, instead of folding their necks sideways along the body under the shells' marginals. They include among their species freshwater turtles, snapping turtles, tortoises, softshell turtles, and sea turtles.

Bashunosaurus is a genus of potentially macronarian sauropod dinosaur from the Middle Jurassic Shaximiao Formation of Kaijiang, China. The type and only species is Bashunosaurus kaijiangensis.

<span class="mw-page-title-main">Trionychia</span> Superfamily of turtles

Trionychia is a superfamily of turtles which encompasses the species that are commonly referred to as softshelled turtles as well as some others. The group contains two families, Carettochelyidae, which has only one living species, the pig-nosed turtle native to New Guinea and Northern Australia, and Trionychidae, the softshelled turtles, containing numerous species native to Asia, North America and Africa. These families likely diverged during the late Jurassic. The oldest known stem-trionychian is Sinaspideretes from the Late Jurassic of China.

<span class="mw-page-title-main">Shaximiao Formation</span> Late Jurassic geological formation in China

The Shaximiao Formation is a Middle to Late Jurassic aged geological formation in Sichuan, China, most notable for the wealth of dinosaurs fossils that have been excavated from its strata. The Shaximiao Formation is exposed in and around the small township of Dashanpu, situated seven kilometres north-east from Sichuan's third largest city, Zigong, in the Da'an District.

The Early Cretaceous Phu Kradung Formation is the lowest member of the Mesozoic Khorat Group which outcrops on the Khorat Plateau in Isan, Thailand. This geological formation consists of micaceous, brown to reddish-brown siltstone beds with minor brown and grey shale and sandstone beds. Occasional lime-noduled conglomerate occurs.

The Xinlong Formation is an Early Cretaceous geologic formation in Guangxi, southern China.

The Nanxiong Formation is a Late Cretaceous geologic formation in Guangdong Province. Dinosaur remains are among the fossils that have been recovered from the formation.

Bashuchelys is an extinct genus of bashuchelyid Middle Jurassic turtle from the Sichuan Basin in the People's Republic of China. As of 2011, it is the only known genus of the family Bashuchelyidae.

Protoxinjiangchelys is an extinct genus of xinjiangchelyid turtle known from the Early to Late Jurassic of China. It is known from the single species P. salis, which was named and described in 2012. It contains only the holotype, ZDM 3009, which consists of a complete shell with an articulated carapace and a complete plastron and possibly another, older specimen.

<span class="mw-page-title-main">Adocidae</span> Extinct family of turtles

The Adocidae are an extinct family of aquatic and omnivorous turtles. They are freshwater cryptodiran turtles and are mainly known from Cretaceous and Paleogene Asia and North America.

<i>Ordosemys</i> Extinct genus of turtles

Ordosemys is an extinct genus of sea turtle from the Cretaceous period.

<span class="mw-page-title-main">Sichuanchelyidae</span> Extinct family of turtles

Sichuanchelyidae is a family of extinct turtles in the clade Testudinata. It includes all perichelydians that are more closely related to Sichuanchelys than Meiolania, Helochelydra, or any extant turtles.

<span class="mw-page-title-main">Sinemydidae</span> Extinct family of turtles

Sinemydidae is an extinct family of turtles from Cretaceous to Paleocene deposits in Asia and North America. Their exact position is engimatic, they have alternatively been considered stem-group cryptodires, but also "crownward stem-turtles" alongside Macrobaenidae, Paracryptodira, Xinjiangchelyidae, Thalassochelydia and Sandownidae outside of crown Testudines.

<span class="mw-page-title-main">Xinjiangchelyidae</span> Extinct family of turtles

Xinjiangchelyidae is an extinct family of turtles known from the Lower Jurassic to the Middle Cretaceous of Asia and western Europe. They have generally been interpreted as either being basal cryptodires or placed outside of crown Testudines.

Shandongemys is an extinct genus of turtle from the Late Cretaceous period of Shandong, China. Its fossils were found in the Wangshi Group.

Varavudh Suteethorn, or Warawut Suteethorn is a Thai geologist and palaeontologist. He is the current director of the Palaeontological Research and Education Centre, Mahasarakham University. He is best known for his work on vertebrate palaeontology in northeastern Thailand, having contributed to the discovery of many fossil taxa and dig sites in the Khorat Plateau, as a part of a long-standing collaboration between Thai and French scientists.

<span class="mw-page-title-main">Nanhsiungchelyidae</span> Extinct family of turtles

Nanhsiungchelyidae is an extinct family of land turtles known from Cretaceous deposits in Asia and North America. Nanhsiungchelyids were more terrestrial than many of their contemporaries, and may have gone extinct at the end of the Cretaceous as a result.

The Xintiangou Formation is a geological formation in China. Part of the stratigraphy of the Sichuan Basin, it is of an uncertain Middle Jurassic age, with preliminary U-Pb estimates giving an age range of 170 ma. It predominantly consists of interbedded mudstone and sandstone, with subordinate shelly limestone. At the Laojun site remains of lungfish, bony fish, freshwater sharks, temnospondyls, sauropterygians, crocodyliformes, the Xinjiangchelyid turtle Protoxinjiangchelys and tritylodontids are known. The dinosaurs Sanxiasaurus,Yunyangosaurus, and indeterminate sauropods are also known from the formation. Theropod and ornithopod tracks have also been reported from the formation.

<i>Yuornis</i> Extinct genus of birds

Yuornis is an extinct genus of enantiornithine bird known from the Late Cretaceous of Henan, China. It contains one species, Yuornis junchangi, named after the late Lü Junchang.

Nanhsiungchelys is a trionychoid turtle from the Upper Cretaceous of Nanhsiung, China. Its genus is derived from the location where it was found, Nanhsiung and the greek word "χελωνα" (chelona), which means turtle. Therefore, Nanhsiungchelys means "turtle from Nanxiong". Nanhsiungchelys has been found in rocks dating to the Maastrichtian of Asia and North America.

References

  1. Ouyang, Hui; Li, Lu; Tong, Haiyan (July 2014). "A revision of Sinaspideretes wimani Young & Chow, 1953 (Testudines: Cryptodira: Trionychoidae) from the Jurassic of the Sichuan Basin, China". Geological Magazine. 151 (4): 600–610. Bibcode:2014GeoM..151..600T. doi:10.1017/S0016756813000575. ISSN   0016-7568. S2CID   128423062.
  2. "Fossilworks: Sinaspideretes wimani". fossilworks.org. Retrieved 17 December 2021.
  3. Evers, Serjoscha W.; Benson, Roger B. J. (January 2019). Smith, Andrew (ed.). "A new phylogenetic hypothesis of turtles with implications for the timing and number of evolutionary transitions to marine lifestyles in the group". Palaeontology. 62 (1): 93–134. doi:10.1111/pala.12384. S2CID   134736808.
  4. Tong, Haiyan; Li, Lu; Ouyang, Hui (2014). "A revision of Sinaspideretes wimani Young & Chow, 1953 (Testudines: Cryptodira: Trionychoidae) from the Jurassic of the Sichuan Basin, China". Geological Magazine. 151 (4): 600–610. doi:10.1017/S0016756813000575. ISSN   0016-7568. S2CID   128423062.

Sources