Sinosaurosphargis Yunguiensis

''Sinosaurosphargis'' is an extinct genus of basal marine saurosphargid reptile known from the Middle Triassic (Anisian age) Guanling Formation of Yunnan and Guizhou Provinces, southwestern China. It contains a single species, ''Sinosaurosphargis yunguiensis''.

Discovery

''Saurosphargis'' is known from several individuals, all of which were collected from Member II of the Guanling Formation, dating to the Pelsonian substage of the latest Anisian stage of the early Middle Triassic, about 243 million years ago. The holotype IVPP V 17040 and paratype IVPP V 16076 are housed at the Institute of Vertebrate Paleontology and Paleoanthropology in Beijing, and represent a nearly complete articulated skeleton and skull, and a partial disarticulated postcranial skeleton including dorsal vertebra, ribs, with osteoderms and gastral rib fragments, respectively. ZMNH M 8797, an incomplete postcranial skeleton showing a very well preserved right forelimb housed at the Zhejiang Museum of Nature History of Hangzhou, was also referred to ''Saurosphargis'' in its original description. The holotype and ZMNH M 8797 were collected at Yangmazhai of Luoping County, Yunnan Province, while the paratype came from Yangjian of Pan County, Guizhou Province. An additional uncatalogued LPV specimen was also referred to ''S. yunguiensis''. These specimens all came from the Lagerstätte discovered during a 2007 geological mapping project with a diverse record of marine life called Luoping Biota, that yielded, apart from ''Sinosaurosphargis'', various invertebrates, fish, basal ichthyosaurs, ''Atopodentatus'', the basal saurosphargid ''Largocephalosaurus'', and several species of eosauropterygian, including both pachypleurosaurs and nothosaurids.

Etymology

''Sinosaurosphargis'' was first described and named by Chun Li, Olivier Rieppel, Xiao-Chun Wu, Li-Jun Zhao and Li-Ting Wang in 2011 and the type species is ''Sinosaurosphargis yunguiensis''. The generic name is derived from Greek ''sino'', meaning "China", ''sauros'', meaning "lizard", and ''sphargis'', the old genus name for the leatherback turtle, (in reference to the many similarities ''Sinosaurosphargis'' shares with ''Saurosphargis'', a taxon whose holotype was lost and was thus considered a mystery), following the pattern of ''Sinosauropteryx''. Like the name of ''Saurosphargis'' itself, it also refers to ''Sinosaurosphargis dorsal osteoderm "body armor" and broadened ribs forming a closed chest rib basket - traits which are seemingly transitional between turtles and other reptiles. The specific name ''yunguiensis'' is derived from the names of the neighboring Yunnan and Guizhou Provinces, where the fossils were found.

Description

''Sinosaurosphargis'' was a small reptile, measuring long without the missing tail. It is a basal marine reptile, closely related to ''Saurosphargis'' from the Lower Muschelkalk of southwestern Poland and eastern Netherlands. ''Sinosaurosphargis'' possesses retracted external nostrils, and shows closed upper temporal fenestrae, and a ventrally open cheek. Its trunk region is short and rounded, and covered by a shield composed of small osteoderms, just like its neck and the proximal portions of all four limbs. Its back vertebrae show elongated, distally expanded transverse projections. The chest ribs are broadened and flat, contacting one another along their length, and forming a closed chest rib basket. Li ''et al.'' (2014) found some of these traits to be shared with all saurosphargids, while others are exclusive to ''Saurosphargis'' and ''Sinosaurosphargis''. These genera have broader and flatter rib baskets than basal saurosphargids like ''Largocephalosaurus'', and also transverse projections of back vertebrae and proximal portions of chest ribs that are much more robust, being much wider than the spacing between them.

Phylogeny

The following cladogram is simplified after the phylogenetic analysis of Li ''et al.'' (2011) and shows the placement of ''Sinosaurosphargis'' within Sauria. Ichthyopterygia was removed from the tree, as it caused a less resolved topology. ''Saurosphargis'' was coded solely based on the holotype, as the Netherlands material remains unprepared.

Li ''et al.'' (2014) presented an updated version of the analysis above, showing interrelationships of all known Saurosphargidae species. The removal / inclusion of Ichthyopterygia was found to affect the topology the most - switching the positions of the ''Eusaurosphargis''+''Helveticosaurus'' and Thalattosauriformes clades, and altering the positions of several taxa within Eosauropterygia, which are not shown.

References

{{Taxonbar, from=Q3961919

Fossil taxa described in 2011
Middle Triassic reptiles of Asia
Fossils of China
Anisian life
Guanling Formation
Saurians
Prehistoric reptile genera