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Sinemydidae; Temporal range: Oxfordian–Late Cretaceous PreꞒ Ꞓ O S D C P T J K Pg N
	Jeholochelys
	Ordosemys
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Pantestudines
Clade:	Testudinata
Clade:	Perichelydia
Family:	†Sinemydidae; Yeh, 1963
Genera
	See text

Sinemydidae is an extinct family of turtles from the Jurassic and Cretaceous of East Asia.^[1] Their exact position is engimatic, they have alternatively been considered stem-group cryptodires, but also "crownward stem-turtles" alongside Macrobaenidae, Paracryptodira, Xinjiangchelyidae, Thalassochelydia and Sandownidae outside of crown Testudines.

Genera

Dracochelys^[2] Lianmugin Formation, China, Early Cretaceous (Aptian-Albian)
Hongkongochelys^[2] Upper Shaximiao Formation, China, Middle-Late Jurassic
Jeholochelys^[2] Jiufotang Formation, China, Early Cretaceous (Aptian)
Liaochelys^[1]^[2] Jiufotang Formation, China, Early Cretaceous (Aptian)
Manchurochelys^[2] Yixian Formation, China, Early Cretaceous (Aptian)
Ordosemys^[2]
- O. leios Luohandong Formation, China, Early Cretaceous
- O. liaoxiensis Chengzihe Formation, China, Early Cretaceous (Aptian)
- O. brinkmania Lianmugin Formation, China, Early Cretaceous (Aptian-Albian)
- O. perforata Khulsangol Formation, Mongolia, Early Cretaceous (Albian)
- O. donghai Chengzihe Formation, China, Early Cretaceous (Aptian-Albian)
Sinemys^[2]
- †Sinemys brevispinus Tong and Brinkman 2012 Laohongdong Formation, China, Early Cretaceous
- †Sinemys chabuensis Ji and Chen 2018 Jingchuan Formation, China, Early Cretaceous (Barremian)
- †Sinemys gamera Brinkman and Peng 1993 Luohandong Formation, China, Early Cretaceous (Valanginian-Hauterivian)
- †Sinemys lens Wiman 1930 Mengyin Formation, China, Early Cretaceous (Berriasian-Valanginian)
Wuguia^[2]
- †Wuguia efremovi Khozatsky 1996 Hutubei Formation, China, Hauterivian/Barremian Lianmuxin Formation, China, Early Cretaceous (Aptian-Albian)
- †Wuguia hutubeiensis Matzke et al. 2004 Hutubei Formation, China, Hauterivian/Barremian
Xiaochelys^[1]^[2] Lianmugin Formation, China, Early Cretaceous (Aptian-Albian)
Yumenemys^[2] Hui-Hui-P'u, China, Late Cretaceous

Material from the Paleocene of California previously attributed to c.f. Sinemyididae is now attributed to macrobaenids.^[3]

References

^ ^a ^b ^c C.-F. Zhou; M. Rabi (2015). "A sinemydid turtle from the Jehol Biota provides insights into the basal divergence of crown turtles". Scientific Reports. 5: 16299. Bibcode:2015NatSR...516299Z. doi:10.1038/srep16299. PMC 4639786. PMID 26553740.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j "Sinemydidae". Fossilworks. Retrieved 17 December 2021.
^ Gentry, Andrew D.; Kiernan, Caitlín R.; Parham, James F. (June 2023). "A large non-marine turtle from the Upper Cretaceous of Alabama and a review of North American "Macrobaenids"". The Anatomical Record. 306 (6): 1411–1430. doi:10.1002/ar.25054. ISSN 1932-8486. PMID 37158131.

External links

"Chelonii: Centrocryptodira". palaeos.com. Archived from the original on April 5, 2023.

This article about a prehistoric turtle is a stub. You can help Wikipedia by expanding it.

[Zhou2015-1] C.-F. Zhou; M. Rabi (2015). "A sinemydid turtle from the Jehol Biota provides insights into the basal divergence of crown turtles". Scientific Reports. 5: 16299. Bibcode:2015NatSR...516299Z. doi:10.1038/srep16299. PMC 4639786. PMID 26553740.

[fw2019-2] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j "Sinemydidae". Fossilworks. Retrieved 17 December 2021.

[3] Gentry, Andrew D.; Kiernan, Caitlín R.; Parham, James F. (June 2023). "A large non-marine turtle from the Upper Cretaceous of Alabama and a review of North American "Macrobaenids"". The Anatomical Record. 306 (6): 1411–1430. doi:10.1002/ar.25054. ISSN 1932-8486. PMID 37158131.

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