Pachygenys

Pachygenys; Temporal range: Early Cretaceous, Aptian–Albian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Squamata
Infraorder:	Scincomorpha
Genus:	†Pachygenys; Gao and Cheng, 1999
Type species
	Pachygenys thlastesa; Gao and Cheng, 1999
Species
	†P.thlastesa Gao and Cheng, 1999 †P.adachii Ikeda, Ota and Saegusa, 2014

Pachygenys ("thick jaw") is a genus of scincomorphan lizard from the Lower Cretaceous of Asia, P. thlastesa from Aptian of Laiyang, China, and P. adachii from Albian of Hyogo, Japan. Its name is composed of the Greek words παχυς pachys ("thick") and γένυς génys ("jaw").^[1]

Description

Pachygenys has a few defining characters, of which include a distinct foreshortening of the dentary tooth row and a reduced amount of dentary teeth. P.adachii differs from P.thlastesa in a few aspects; P.adachii has a shorter tooth row than P.thlastesa, as well as anterior and middle teeth that have uncuspid crowns and posterior teeth with simple, uncuspid conical crowns.^[1]

References

^ ^a ^b Ikeda, Tadahiro; Oti, Hidetoshi (2014). "A new fossil lizard from the Lower Cretaceous Sasayama Group of Hyogo prefecture, western Honshu, Japan". Journal of Vertebrate Paleontology. 35: e885032. doi:10.1080/02724634.2014.885032. S2CID 84568156.

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[ikedaetal2014-1] Ikeda, Tadahiro; Oti, Hidetoshi (2014). "A new fossil lizard from the Lower Cretaceous Sasayama Group of Hyogo prefecture, western Honshu, Japan". Journal of Vertebrate Paleontology. 35: e885032. doi:10.1080/02724634.2014.885032. S2CID 84568156.

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