Urumchia

Urumchia; Temporal range: Early Triassic
	Skull cast, Tianjin Natural History Museum
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Synapsida
Clade:	Therapsida
Suborder:	†Therocephalia
Family:	†Regisauridae
Genus:	†Urumchia; Young, 1952
Type species
	†Urumchia lii; Young, 1952

Urumchia is an extinct genus of therocephalian therapsids from the Early Triassic of China. The type species Urumchia lii was described by Chinese paleontologist C. C. Young (Yang Zhongjian) in 1952 from the Jiucaiyuan Formation in Xinjiang. The holotype skull has been lost, but Young was able to describe the species on the basis of a detailed cast of the skull.^[1] Urumchia is similar to the South African therocephalian Regisaurus in having an expanded pair of vomer bones on the underside of the skull that form a secondary palate.^[2] In Urumchia the front end of the vomers narrow to a point, while in Regisaurus they do not. Urumchia has six incisors on either side of the upper jaw, a primitive condition among baurioid therocephalians that usually have fewer incisors.^[1]

References[]

^ ^a ^b Sun, A. (1991). "A review of Chinese therocephalian reptiles" (PDF). Vertebrata PalAsiatica. 29 (2): 85–94.
^ Abdala, F.; Rubidge, B. S.; Van Den Heever, J. (2008). "The Oldest Therocephalians (Therapsida, Eutheriodontia) and the Early Diversification of Therapsida". Palaeontology. 51 (4): 1011. doi:10.1111/j.1475-4983.2008.00784.x.

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[SA91-1] Sun, A. (1991). "A review of Chinese therocephalian reptiles" (PDF). Vertebrata PalAsiatica. 29 (2): 85–94.

[ARH08-2] Abdala, F.; Rubidge, B. S.; Van Den Heever, J. (2008). "The Oldest Therocephalians (Therapsida, Eutheriodontia) and the Early Diversification of Therapsida". Palaeontology. 51 (4): 1011. doi:10.1111/j.1475-4983.2008.00784.x.

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