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Class Mammalia
Order Perissodactyla
Family Equidae

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Species A—Unnamed Horse // Equus francescana—Francescana Zebra // Equus simplicidens—American Zebra

Equus Species A—Unnamed HorsePleistocene distribution of Equus Species A

Horse material from the Camel Room site in Dry Cave appears quite different from other Dry Cave horses. Harris and Porter (1980) listed this as Species A. Quoting that publication (p. 61), "The dentition of 25-537 appears to be of a zebrine about the size of Burchell's zebra or somewhat smaller. It has, for example, all the zebrine features noted by McGrew (1944)—the V-shaped metaconid-metastylid groove and the well-developed parastylid and hypostylid on dP3 . As noted by Quinn (1955) in modern zebras, the ectoflexid intrudes well into the metaconid-metastylid column, dividing it into a pre-isthmus and a post-isthmus." The lower incisors lack an infundibulum.

We found no other late Wisconsin horse described that seems to fit the characters observed in the specimen, but preferred to leave this as Equus, Species A.

two sectioned lower teeth showing zebrine characters

Fig. 1. Two sectioned lower teeth showing zebrine characters. UTEP 25-537. Scale in mm.

Sites.

Late Wisconsin: Camel Room (Harris and Porter 1980).

Literature.

Harris and Porter 1980; McGrew 1944; Quinn 1955.

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Equus (Plesippus) sp.—American ZebraRegional Pleistocene distribution of Equus (Plesippus) sp.

Synonyms. Plesippus sp.

Sites.

Irvingtonian: El Golfo (Croxen et al. 2007).

Literature. Croxen et al. 2007.

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Equus (Plesippus) francescana (Frick 1921)—Francescana ZebraRegional Pleistocene distribution of Equus francescana

Sites.

Early Irvingtonian: El Casco, San Timoteo Badlands (Albright 2000).

Literature. Albright 2000.

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Equus simplicidens Cope 1892—American ZebraRegional Pleistocene distribution of Equus simplicidens

Synonyms. Plesippus simplicidens.

Sites.

Late Blancan: 111 Ranch (Morgan and White 2005: ?).

Late Blancan/Irvingtonian: Anza-Borrego (Murray 2008: cf.).

Literature.

Morgan and White 2005; Murray 2008.

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Last Update: 13 Apr 2014