Osteopygis

Osteopygis Temporal range: Late Cretaceous – Eocene, 70.6–48.6  Ma PreꞒ Ꞓ O S D C P T J K Pg N
Osteopygis emarginatus carapace
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Pantestudines
Clade:	Testudinata
Family:	† Macrobaenidae
Genus:	† Osteopygis Cope, 1868
Type species
Osteopygis emarginatus Cope, 1868
Species [1]
O. emarginatusCope, 1868 O. backmaniRussell, 1934 O. kranziWeems, 2014 O. russelliBrinkman, 2015

Osteopygis is a genus of extinct turtle. ^[2] Osteopygis, as traditionally seen, is a chimera: the postcrania (including the holotype) belong to a non-marine stem-cryptodire, whilst the crania belong to sea turtles. In 2005, the referred material was split between two taxa: the postcrania remained in Osteopygis, while the crania were reassigned to Euclastes wielandi . ^[3]

References

1. Gentry, A.D.; Kiernan, C.R.; Parham, J.F. (2022). "A large non-marine turtle from the Upper Cretaceous of Alabama and a review of North American "Macrobaenids"". The Anatomical Record. doi:10.1002/ar.25054.
2. "†Osteopygis Cope 1868". Paleobiology Database. Fossilworks. Retrieved 17 December 2021.
3. A reassessment of the referral of sea turtle skulls to the genus Osteopygis (Late Cretaceous, New Jersey, USA)