Yunnan horse

Not to be confused with the Yannon domestic horse breed.

Yunnan horse Temporal range: Pleistocene
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Perissodactyla
Family:	Equidae
Genus:	Equus
Species:	†E. yunnanensis
Binomial name
*Equus yunnanensis* Colbert (1940)

The Yunnan horse (Equus yunnanensis) was an extinct horse that once roamed in Pleistocene East Asia^[1]^[2]^[3] very likely as a grazer on open tracts of grassland.^[1] It was a small horse comparable in size to the modern Przewalski's horse.

It was first described by Edwin H. Colbert from dental fossils collected by Walter W. Granger in the Ma Kai Valley in northern Yunnan ten miles south of the town of Ma kai in Guangnan County as part of the program of the Central Asiatic Expeditions of the American Museum of Natural History in the winter of 1926–1927.^[2] They were the most numerous fossils of a single type of animal in the Ma Kai Valley deposits.

Edwin H. Colbert thought it almost identical with an Equus collected by Teilhard de Chardin in the Upper Irrawaddy sediments of Burma: "Indeed, judging by the evidence at hand, these two representations of the genus, one in Burma and one in Yunnan appear to be cospecific".^[2]

References

1 2 Elewa, Ashraf M. T. (2008). Mass Extinction. Springer ISBN 978-3-540-75915-7 p. 172
1 2 3 Colbert, EH. (1940). Pleistocene mammals from the Ma Kai valley of northern Yunnan, China. American Museum Novitates, 1099
↑ Liu H, Yu Y, (1974), New materials of E. yunnanensis in Yanmou, Yunnan. On diagnosis of E. yunnanensis and phylogeny of Equus in Asia. Vertebrata Palasiatica, 12 (2), 126–134.

Species of the genus Equus

Extinct species are marked †

Asses	Equus africanus Equus africanus africanus Equus africanus asinus †Equus africanus atlanticus Equus africanus somaliensis Equus hemionus Equus hemionus hemionus †Equus hemionus hemippus Equus hemionus khur Equus hemionus kulan Equus hemionus luteus Equus hemionus onager †Equus hydruntinus Equus kiang

Zebras	Equus grevyi Equus quagga Equus quagga burchellii Equus quagga boehmi Equus quagga borensis Equus quagga chapmani Equus quagga crawshayi Equus quagga selousi †Equus quagga quagga †Equus stenonis †Equus simplicidens Equus zebra Equus zebra hartmannae Equus zebra zebra

Horses	†Equus alaskae †Equus cedralensis †Equus complicatus †Equus conversidens †Equus crinidens †Equus cumminsii †Equus excelsus Equus ferus Equus ferus caballus †Equus ferus ferus Equus ferus przewalskii †Equus francisci †Equus fraternus †Equus giganteus †Equus lambei †Equus mexicanus †Equus namadicus †Equus niobrarensis †Equus occidentalis †Equus pacificus †Equus parastylidens †Equus pectinatus †Equus semiplicatus †Equus scotti †Equus sivalensis †Equus yunnanensis

Equidae Evolution of the horse Wild horse Domestication of the horse

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