''Yunguisaurus'' is an extinct

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial n ...

pistosaur Pistosauroidea is a group of marine reptiles within the superorder Sauropterygia that first appeared in the latter part of the Early Triassic and were the ancestors of plesiosaurs. Pistosauroids are rare in Triassic marine assemblages, and are re ...

known from the

Guizhou Province Guizhou (; formerly Kweichow) is a landlocked province in the southwest region of the People's Republic of China. Its capital and largest city is Guiyang, in the center of the province. Guizhou borders the autonomous region of Guangxi to t ...

of China.

Description

''Yunguisaurus'' is known from the

holotype A holotype is a single physical example (or illustration) of an organism, known to have been used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of seve ...

NMNS The National Museum of Natural Science () is a national museum in North District, Taichung, Taiwan. Overview The museum covers and is a six-venue complex housing: the Space Theater, Science Center, Life Science Hall, Human Cultures Hall, Gl ...

004529/F003862, an articulated and almost complete

skeleton A skeleton is the structural frame that supports the body of an animal. There are several types of skeletons, including the exoskeleton, which is the stable outer shell of an organism, the endoskeleton, which forms the support structure inside ...

missing only the distal tail. The preserved skeleton has a length of about with estimated total length about , while

paratype In zoology and botany, a paratype is a specimen of an organism that helps define what the scientific name of a species and other taxon actually represents, but it is not the holotype (and in botany is also neither an isotype nor a syntype). O ...

specimen became much larger with length around . It was collected near Huangnihe River, Chajiang of Guizhou, from the

Falang Formation Farang ( fa, فرنگ) is a Persian (and Southeast Asian) word that originally referred to the Franks (the major Germanic tribe) and later came to refer to White Europeans in general. The word "Farang" is a cognate and originates from Old F ...

. It is thought to belong to the ''Paragondolella naantangensis-P. polygnathiformis'' Assemblage Zone, dating to the

Carnian The Carnian (less commonly, Karnian) is the lowermost stage of the Upper Triassic Series (or earliest age of the Late Triassic Epoch). It lasted from 237 to 227 million years ago (Ma). The Carnian is preceded by the Ladinian and is followe ...

stage of the early

Late Triassic The Late Triassic is the third and final epoch (geology), epoch of the Triassic geologic time scale, Period in the geologic time scale, spanning the time between annum, Ma and Ma (million years ago). It is preceded by the Middle Triassic Epoch ...

. It differs from other pistosauroids by a combination of characters. Nevertheless, its original description is a preliminary report while the postcranial skeleton still waits for further preparation and full description.

Etymology

''Yunguisaurus'' was first named by Yen-Nien Cheng, Tamaki Sato, Xiao-Chun Wu and Chun Li in 2006 and the

type species In zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the species that contains the biological type specimen( ...

is ''Yunguisaurus liae''. The generic name is derived from the Yungui Gaoyuan, a plateau named after the

Yunnan Yunnan , () is a landlocked province in the southwest of the People's Republic of China. The province spans approximately and has a population of 48.3 million (as of 2018). The capital of the province is Kunming. The province borders the ...

and

Guizhou Guizhou (; formerly Kweichow) is a landlocked province in the southwest region of the People's Republic of China. Its capital and largest city is Guiyang, in the center of the province. Guizhou borders the autonomous region of Guangxi to t ...

provinces, in which the holotype was found, and ''saurus'',

Greek Greek may refer to: Greece Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group. *Greek language, a branch of the Indo-European language family. **Proto-Greek language, the assumed last common ancestor ...

for "lizard". The specific name honors

IVPP The Institute of Vertebrate Paleontology and Paleoanthropology (IVPP; ) of China is a research institution and collections repository for fossils, including many dinosaur and pterosaur specimens (many from the Yixian Formation). As its name sugges ...

Professor Jinling Li for contributing to the recent study of the Chinese Triassic marine vertebrate fauna.

References

Fossil taxa described in 2006 Late Triassic reptiles of Asia Pistosaurs Triassic sauropterygians Sauropterygian genera {{triassic-reptile-stub