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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
O. emarginatus Cope, 1868 O. backmani Russell, 1934 O. kranzi Weems, 2014 O. russelli Brinkman, 2015

Osteopygis is a genus of extinct turtle. 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.

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)

v t e Pantestudines
Kingdom: Animalia Phylum: Chordata Class: Sauropsida Clade: Diapsida Clade: Sauria Clade: Archelosauria Sauropsida see Sauropsida Pantestudines see below↓ Pantestudines
Pantestudines †Eorhynchochelys †Eunotosaurus? †Odontochelys †Pappochelys Testudinata †Chinlechelys †Condorchelys †Eileanchelys †Heckerochelys †Indochelys †Kallokibotion †Kayentachelys †Proganochelys †Proterochersis †Spoochelys †Australochelyidae Australochelys Palaeochersis Waluchelys †Meiolaniformes Chubutemys Otwayemys Patagoniaemys Peligrochelys Trapalcochelys Meiolaniidae Gaffneylania Meiolania Ninjemys Niolamia Warkalania †Sichuanchelyidae Laurasichersis Mongolochelys Sichuanchelys †Helochelydridae Aragochersis Helochelydra Helochelys Naomichelys Solemys †Compsemydidae Berruchelus Calissounemys Compsemys Kallokibotion? Peltochelys Riodevemys? Selenemys? Tongemys †Paracryptodira Compsemydidae? Helochelydridae? Pleurosternidae Dinochelys Dorsetochelys Glyptops Pleurosternon Riodevemys? Selenemys? Toremys Uluops Baenidae Arundelemys Arvinachelys Baena Boremys Cedrobaena Chisternon Denazinemys Edowa Eubaena Gamerabaena Gehennachelys Goleremys Hayemys Lakotemys Neurankylus Palatobaena Peckemys Plesiobaena Protobaena Saxochelys Scabremys Stygiochelys Thescelus Trinitichelys †Xinjiangchelyidae Annemys Brodiechelys Camerochelys Chengyuchelys Jastmelchyi Kalasinemys Larachelus Phunoichelys Protoxinjiangchelys Shartegemys Siamochelys Tienfuchelys Undjulemys Xinjiangchelys Yanduchelys †Sinemydidae / Macrobaenidae Anatolemys Appalachemys Asiachelys Aurorachelys Changmachelys Dracochelys Gallica Galvechelone Hongkongochelys Hoyasemys Jeholochelys Judithemys Kirgizemys Liaochelys Macrobaena Manchurochelys Ordosemys Osteopygis Oxemys Sinemys Tienfucheloides Wuguia Xiaochelys Yakemys Yumenemys †Thalassochelydia (sensu Joyce et al., 2021) Aplax Cyrtura Euryaspis Hispaniachelys Neusticemys Owadowia Pelobatochelys Thalassemys Protostegidae? "Eurysternidae" Achelonia Chelonides Eurysternum Hydropelta Idiochelys Palaeomedusa Parachelys "Plesiochelyidae" Craspedochelys Globochelus Hylaeochelys? Jurassichelon? Plesiochelys Portlandemys Tropidemys Sandownidae Angolachelys Brachyopsemys Leyvachelys Sandownia Solnhofia? Testudines see Testudines
See also: Angolachelonia Ankylopoda Mesochelydia Perichelydia Category

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• Macrobaenidae
• Late Cretaceous turtles
• Paleogene turtles
• Nomina dubia
• Fossil taxa described in 1868
• Taxa named by Edward Drinker Cope
• Prehistoric turtle stubs