Mammalia - Perissodactyla - Equidae
Full reference: R. A. Stirton. 1940. Phylogeny of North American Equidae. University of California Publications in Geological Sciences 25(4):165-198
Parent taxon: Pliohippus according to J. F. Lance 1950
See also Baskin 1991, Carroll 1988, Forsten 1975, Kelly 1995, MacFadden 1986, MacFadden 1998, Mooser 1968, Prado and Alberdi 1996, Prothero and Schoch 1989, Quinn 1955 and Stirton 1940
Sister taxa: Pliohippus (Pliohippus), Pliohippus bakeri, Pliohippus coalingensis, Pliohippus fossulatus, Pliohippus gracilis, Pliohippus mirabilis, Pliohippus nobilis, Pliohippus pernix, Pliohippus potosinus, Pliohippus proversus, Pliohippus tantalus, Pliohippus tehonensis
Subtaxa: Pliohippus (Astrohippus) stockii
Type: Protohippus ansae
Ecology: ground dwelling browser
Distribution: there are no occurrences of Pliohippus (Astrohippus) in the database