Xinjiangchelyidae

Xinjiangchelyidae; Temporal range: Toarcian–Albian PreꞒ Ꞓ O S D C P T J K Pg N
	Xinjiangchelys wusu
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Pantestudines
Clade:	Testudinata
Clade:	Perichelydia
Family:	†Xinjiangchelyidae; Nessov, 1990
Genera
	See text

Xinjiangchelyidae is an extinct family of turtles known from the Lower Jurassic to the Middle Cretaceous of Asia and western Europe.^[1] They have generally been interpreted as either being basal cryptodires or placed outside of crown Testudines.

Genera

Annemys Itat Formation, Russia, Middle Jurassic (Bathonian) Qigu Formation, Shishugou Formation, China, Late Jurassic (Oxfordian) Ulan Malgait Formation, Mongolia, Late Jurassic (Tithonian)
Brodiechelys Vectis Formation, United Kingdom, Early Cretaceous (Barremian) Arcillas de Morella Formation, Spain, Early Cretaceous (Aptian)
Camerochelys^[2] Enciso Group, Spain, Early Cretaceous (Barremian-Aptian)
Jastmelchyi
Kalasinemys^[3] Phu Kradung Formation, Thailand, Tithonian
Larachelus Pinilla de los Moros Formation, Spain, Early Cretaceous (Hauterivian-Barrmeian)
Phunoichelys Phu Kradung Formation, Thailand, Tithonian
Shartegemys Ulan Malgait Formation, Mongolia, Late Jurassic (Tithonian)
Tienfuchelys Shaximiao Formation, China, Middle-Upper Jurassic
Undjulemys Onjüül locality, Mongolia, Late Jurassic
Xinjiangchelys Middle Jurassic-Early Cretaceous, Asia
Protoxinjiangchelys^[4]^[5] Xintiangou Formation, China, Lower-Middle Jurassic

Phylogeny

Cladogram of Perichelydia after Miller et al. 2023, showing the two proposed positions of Xinjiangchelyidae.^[6]

Perichelydia

†Mongolochelys

†Meiolaniformes (Meiolania)

†Paracryptodira

†Sinemydidae+†Xinjiangchelyidae?

	†Protostegidae?

	†Thalassochelydia

Pleurodira (side-necked turtles)

Pan‑Cryptodira

†Sinemydidae+†Xinjiangchelyidae?

Cryptodira (hidden-neck turtles)

Pan-Trionychia (soft-shelled and pig-nosed turtles)

Pan-Testudinoidea (tortoises, pond turtles/terrapins, etc)

Pan-Chelonioidea (sea turtles, possibly including †Protostegidae)

	Pan-Kinosternoidea (musk turtles, hickatee, etc)

	Chelydridae (snapping turtles)

References

↑ "Xinjiangchelyidae". Fossilworks. Retrieved 17 December 2021.
↑ A. Pérez-García; F.-R. Sáez-Benito; X. Murelaga (2017). "New information on the anatomy and systematics of the Spanish Lower Cretaceous Camerochelys vilanovai (Testudines, Pan-Cryptodira)". Journal of Iberian Geology. in press. doi:10.1007/s41513-017-0014-6.
↑ Haiyan Tong, Wilailuck Naksri, Eric Buffetaut, Suravech Suteethorn, Varavudh Suteethorn, Phornphen Chantasit and Julien Claude. 2019. Kalasinemys, A New Xinjiangchelyid Turtle from the Late Jurassic of NE Thailand. Geological Magazine. 156(1); 1645-1656. DOI: 10.1017/S0016756818000791
↑ H. Tong, I. Danilov, Y. Ye, H. Ouyang, and G. Peng. 2012. Middle Jurassic turtles from the Sichuan Basin, China: a review. Geological Magazine 149(4):675-695
↑ H. -K. Yeh. 1990. Fossil turtles from Dashanpu, Zigong, Sichuan. Vertebrata PalAsiatica 28(4):305-311
↑ Miller, Eve; Lee, Hiu Wai; Abzhanov, Arkhat; Evers, Serjoscha W. (August 2024). "The topological organization of the turtle cranium is constrained and conserved over long evolutionary timescales". The Anatomical Record. 307 (8): 2713–2748. doi:10.1002/ar.25356. ISSN 1932-8486. PMID 38102921.

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[1] "Xinjiangchelyidae". Fossilworks. Retrieved 17 December 2021.

[2] A. Pérez-García; F.-R. Sáez-Benito; X. Murelaga (2017). "New information on the anatomy and systematics of the Spanish Lower Cretaceous Camerochelys vilanovai (Testudines, Pan-Cryptodira)". Journal of Iberian Geology. in press. doi:10.1007/s41513-017-0014-6.

[3] Haiyan Tong, Wilailuck Naksri, Eric Buffetaut, Suravech Suteethorn, Varavudh Suteethorn, Phornphen Chantasit and Julien Claude. 2019. Kalasinemys, A New Xinjiangchelyid Turtle from the Late Jurassic of NE Thailand. Geological Magazine. 156(1); 1645-1656. DOI: 10.1017/S0016756818000791

[4] H. Tong, I. Danilov, Y. Ye, H. Ouyang, and G. Peng. 2012. Middle Jurassic turtles from the Sichuan Basin, China: a review. Geological Magazine 149(4):675-695

[5] H. -K. Yeh. 1990. Fossil turtles from Dashanpu, Zigong, Sichuan. Vertebrata PalAsiatica 28(4):305-311

[6] Miller, Eve; Lee, Hiu Wai; Abzhanov, Arkhat; Evers, Serjoscha W. (August 2024). "The topological organization of the turtle cranium is constrained and conserved over long evolutionary timescales". The Anatomical Record. 307 (8): 2713–2748. doi:10.1002/ar.25356. ISSN 1932-8486. PMID 38102921.

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