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Equus francisci
''Equus francisci'' is an extinct species of ''Equus'' (the genus that includes the horse) which was native to North America.〔(The Paleobiology Database )〕 Specimens of ''E. francisci'' have been found from northern Texas to southern South Dakota and in Alberta, Canada.〔 Evidence shows this species to have evolved in North America.〔 et al. 2005 "Evolution, Systematics, and Phylogeography of Pleistocene Horses in the New World: A Molecular Perspective" PLoS Biol 3(8): e241 〕
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.〔 "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〕 ''Equus arrelanoi'' and ''Equus quinni'' were synonymized with ''Equus tau'' in 1980. ''Equus tau'' was, in turn synonymized with ''E. francisci'' in 1989.〔 The species ''Equus achates'' was named by Hay and Cook in 1930 and synonymized with ''E. francisci'' in 1995.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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