Equus francisci

Equus francisci Temporal range: 4.9–0.011 Ma PreЄ Є O S D C P T J K Pg N ↓ Blancan to Rancholabrean
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Perissodactyla
Family:	Equidae
Genus:	Equus
Species:	†E. francisci
Binomial name
†Equus francisci Hay, 1915
Synonyms
†Equus achates †Equus arrelanoi †Equus calobatus †Equus quinni †Equus tau

Equus francisci is an extinct species of Equus (the genus that includes the horse) which was native to North America.^[1] Specimens of E. francisci have been found from northern Texas to southern South Dakota and in Alberta, Canada.^[1] Evidence shows this species to have evolved in North America.^[2]

The species Equus francisci was originally described in 1915. The same year a separate species was described from a limb bone as Equus calobatus by Troxell. This species was found in the Irvingtonian terrestrial horizon in the Tule Formation of Rock Creek, Texas. Equus calobatus is considered distinct from E. francisci on the basis of its significantly larger size, as measured from metapodials.^[3] Equus arrelanoi and Equus quinni were synonymized with Equus tau in 1980. Equus tau was, in turn synonymized with E. francisci in 1989.^[1] The species Equus achates was named by Hay and Cook in 1930 and synonymized with E. francisci in 1995.^[1]

References

1 2 3 4 The Paleobiology Database.
↑ Weinstock, Jaco et al. (2005). "Evolution, Systematics, and Phylogeography of Pleistocene Horses in the New World: A Molecular Perspective" PLoS Biol 3(8): e241 doi:10.1371/journal.pbio.0030241.
↑ Scott, Eric (2004). "Pliocene and Pleistocene horses from Porcupine Cave", Biodiversity Response to Environmental Change in the Middle Pleistocene: The Porcupine Cave Fauna from Colorado, ed. A.D. Barnosky, University of California, p. 264-279.

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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