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Class Mammalia
Order Perissodactyla
Family Equidae


Equidae—Family Equidae // Equidae sp.—Horses // Equus sp. (small)—Small Horse // Equus sp (large)—Large Horse // Equus calobatus—Stilt-legged Onager // Equus conversidens—Mexican Horse // Equus cumminsii—Cummings' Ass // Equus enormis—Enormous Horse // Equus fraternus—Fraternal Horse // Equus giganteus—Giant Horse // Equus occidentalis—Western Horse // Equus pacificus—Pacific Horse // Equus (Plesippus) sp.—American Zebra // Equus (Plesippus) francescana—Francescana Zebra // Equus (Plesippus) simplicidens—American Zebra // Equus Species A—Unidentified Equus // Haringtonhippus francisci—Harington's Stilt-legged Horse

Equus cumminsii Cope 1893—Cummins' AssRegional Pleistocene distribution of Equus cumminsii

Kurtén and Anderson (1980) viewed this species as belonging to the subgenus Asinus. Also see the discussion in Scott (2005). The species was described on the basis of upper teeth (Gidley 1907), with lower dentition later referred. A lower jaw containing all cheek teeth (Fig. 1) is available from Chihuahua with the only locality data given as "First terrace above Rio Grande floodplain on south side of river." Without more data, it is assumed here to be Blancan Pleistocene, though it could be from apparently pre-Pleistocene Blancan sites such as occur along the Rio Grande Valley immediately downstream to the southeast (Strain 1966; Akersten 1972).

Lower right toothrow of Equus cumminsii

Fig. 1. Right lower tooth row of Equus cumminsii (UTEP 156-1) from the Blancan of Chihuahua, Mexico. The image has been manipulated to better show occlusal details. Length of tooth row at occlusal surface, 152.3 mm.


Late Blancan: Abo Arroyo (Morgan and Harris 2015); 111 Ranch (Morgan and White 2005: ?); First Terrace (UTEP).

Literature. Akersten 1972; Kurtén and Anderson 1980; Morgan and Harris 2015; Morgan and White 2005; Scott 2005; Strain 1966.


Last Update: 6 Jul 2018