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
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. emarginatus Cope, 1868; O. backmani Russell, 1934; O. kranzi Weems, 2014; O. russelli Brinkman, 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

^ 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.
^ "†Osteopygis Cope 1868". Paleobiology Database. Fossilworks. Retrieved 17 December 2021.
^ A reassessment of the referral of sea turtle skulls to the genus Osteopygis (Late Cretaceous, New Jersey, USA)

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[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.

[fossilworks-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)