†Calippus (Grammohippus) Hulbert, Jr. 1988 (horse)
Mammalia - Perissodactyla - Equidae
Full reference: R. C. Hulbert, Jr. 1988. Calippus and Protohippus (Mammalia, Perissodactyla, Equidae) from the Miocene (Barstovian-early Hemphillian) of the Gulf Coastal Plain. Bulletin of the Florida State Museum, Biological Sciences 32(3):221-340
Parent taxon: Calippus according to R. C. Hulbert 1988
See also Prado and Alberdi 1996
Sister taxa: none
Subtaxa: none
Ecology: ground dwelling grazer
Distribution: found only at Verdigre Quarry (Miocene of Nebraska)