''Stenoplacosaurus'' is an extinct

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

of glyptosaurine

anguid Anguidae refers to a large and diverse family of lizards native to the Northern Hemisphere. It contains 9 genera and 89 extant species. Common characteristics of this group include a reduced supratemporal arch, striations on the medial faces of t ...

lizards from the

Eocene The Eocene ( ) is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (Ma). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene'' comes ...

of Inner Mongolia, China. The genus is

monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unisp ...

, containing only the species ''Stenoplacosaurus mongoliensis''.

Taxonomy

''Stenoplacosaurus'' was originally named ''Helodermoides mongoliensis'' by Sullivan (1979) for remains found in the Shara Murun Formation of

Inner Mongolia Inner Mongolia, officially the Inner Mongolia Autonomous Region, is an Autonomous regions of China, autonomous region of China. Its border includes two-thirds of the length of China's China–Mongolia border, border with the country of Mongolia. ...

, China. In their redescription of '' Placosaurus'', Sullivan and Auge (2006) transferred ''H. mongoliensis'' to ''Placosaurus'', as ''P. mongoliensis''. However, Sullivan and Dong (2018) found it to be generically distinct from the ''Placosaurus'' type species and renamed it ''Stenoplacosaurus''.

References

{{Extinct squamates, A. Anguidae Eocene reptiles of Asia Eocene lepidosaurs Fossil taxa described in 2018 Taxa named by Robert M. Sullivan