''Stenoplacosaurus'' is an extinct

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

of glyptosaurine

anguid Anguidae refers to a large and diverse family of lizards native to the Northern Hemisphere. Common characteristics of this group include a reduced supratemporal arch, striations on the medial faces of tooth crowns, osteoderms, and a lateral fold ...

lizards from the

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

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 "unispec ...

, 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 region of the People's Republic of China. Its border includes most of the length of China's border with the country of Mongolia. Inner Mongolia also accounts for a ...

, 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. Anguids Eocene reptiles of Asia Eocene lepidosaurs Fossil taxa described in 2018 Taxa named by Robert M. Sullivan