Xinjiangchelyidae is an extinct family of

turtle Turtles are an order of reptiles known as Testudines, characterized by a special shell developed mainly from their ribs. Modern turtles are divided into two major groups, the Pleurodira (side necked turtles) and Cryptodira (hidden necked tu ...

s known from the

Lower Jurassic The Early Jurassic Epoch (in chronostratigraphy corresponding to the Lower Jurassic Series) is the earliest of three epochs of the Jurassic Period. The Early Jurassic starts immediately after the Triassic-Jurassic extinction event, 201.3 Ma&nb ...

to the Middle Cretaceous of

Asia Asia (, ) is one of the world's most notable geographical regions, which is either considered a continent in its own right or a subcontinent of Eurasia, which shares the continental landmass of Afro-Eurasia with Africa. Asia covers an area ...

and western

Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a Continent#Subcontinents, subcontinent of Eurasia ...

. They have generally been interpreted as either being basal

cryptodires The Cryptodira ('' el, hidden neck'') are a suborder of Testudines that includes most living tortoises and turtles. Cryptodira differ from Pleurodira (side-necked turtles) in that they lower their necks and pull the heads straight back into the ...

or placed outside of crown Testudines.

Genera

*'' Annemys''

Itat Formation The Itat Formation (Russian: итатская свита) is a geologic formation in western Siberia. It was deposited in the Bajocian to Bathonian ages of the Middle Jurassic. Dinosaur remains are among the fossils that have been recovered from t ...

, Russia, Middle Jurassic (

Bathonian In the geologic timescale the Bathonian is an age and stage of the Middle Jurassic. It lasted from approximately 168.3 Ma to around 166.1 Ma (million years ago). The Bathonian Age succeeds the Bajocian Age and precedes the Callovian Age. Strat ...

)

Qigu Formation The Qigu Formation is a Late Jurassic ( Oxfordian) geologic formation in the Southern Junggar Basin in China. Indeterminate Dinosaur remains are among the fossils that have been recovered from the formation, including theropod teeth and a fibula. ...

Shishugou Formation The Shishugou Formation () is a geological formation in Xinjiang, China. Its strata date back to the Late Jurassic period. Dinosaur remains are among the fossils that have been recovered from the formation.Weishampel, David B; et al. (2004). "Din ...

, China, Late Jurassic ( Oxfordian)

Ulan Malgait Formation The Ulan Malgait Formation is a Late Jurassic geologic formation in Mongolia. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.Weishampel et al., 2004, p ...

, Mongolia, Late Jurassic (

Tithonian In the geological timescale, the Tithonian is the latest age of the Late Jurassic Epoch and the uppermost stage of the Upper Jurassic Series. It spans the time between 152.1 ± 4 Ma and 145.0 ± 4 Ma (million years ago). It is preceded by the K ...

) *''

Brodiechelys ''Brodiechelys'' is an extinct genus of terrestrial turtle belonging to the family Xinjiangchelyidae. Remains of ''Brodiechelys'' dated back to the Early Cretaceous period (Berriasian to Barremian stages), and have been found in the United Kingdo ...

Vectis Formation The Vectis Formation is a geological formation on the Isle of Wight and Swanage, England whose strata were formed in the lowermost Aptian, approximately 125 million years ago."Magnetostratigraphy of the Lower Cretaceous Vectis Formation (Wealden ...

, United Kingdom, Early Cretaceous (

Barremian The Barremian is an age in the geologic timescale (or a chronostratigraphic stage) between 129.4 ± 1.5 Ma (million years ago) and 121.4 ± 1.0 Ma). It is a subdivision of the Early Cretaceous Epoch (or Lower Cretaceous Series). It is preceded ...

) Arcillas de Morella Formation, Spain, Early Cretaceous (

Aptian The Aptian is an age in the geologic timescale or a stage in the stratigraphic column. It is a subdivision of the Early or Lower Cretaceous Epoch or Series and encompasses the time from 121.4 ± 1.0 Ma to 113.0 ± 1.0 Ma (million years ago), a ...

) *'' Camerochelys'' Enciso Group, Spain, Early Cretaceous (Barremian-Aptian) *'' Jastmelchyi'' *'' Kalasinemys'' Phu Kradung Formation, Thailand, Tithonian *'' Larachelus'' Pinilla de los Moros Formation, Spain, Early Cretaceous (

Hauterivian The Hauterivian is, in the geologic timescale, an age in the Early Cretaceous Epoch or a stage in the Lower Cretaceous Series. It spans the time between 132.9 ± 2 Ma and 129.4 ± 1.5 Ma (million years ago). The Hauterivian is preceded by the Va ...

-Barrmeian) *'' Phunoichelys'' Phu Kradung Formation, Thailand, Tithonian *'' Shartegemys'' Ulan Malgait Formation, Mongolia, Late Jurassic (Tithonian) *'' Tienfuchelys''

Shaximiao Formation The Shaximiao Formation () is a Middle Jurassic, Middle to Late Jurassic aged geological formation in Sichuan, China, most notable for the wealth of dinosaurs fossils that have been excavated from its strata. The Shaximiao Formation is exposed in ...

, China, Middle-Upper Jurassic *'' Undjulemys'' Onjüül locality, Mongolia, Late Jurassic *''

Xinjiangchelys ''Xinjiangchelys'' is an extinct genus of xinjiangchelyid turtle known from the Middle Jurassic to Early Cretaceous of China and Kyrgyzstan Kyrgyzstan,, pronounced or the Kyrgyz Republic, is a landlocked country in Central Asia. K ...

'' Middle Jurassic-Early Cretaceous, Asia *'' Protoxinjiangchelys''H. -K. Yeh. 1990. Fossil turtles from Dashanpu, Zigong, Sichuan. Vertebrata PalAsiatica 28(4):305-311 Xintiangou Formation, China, Lower-Middle Jurassic

References

Testudinata Prehistoric reptile families {{paleo-turtle-stub