Mammalia - Perissodactyla - Equidae

Parent taxon: Equini according to B. J. MacFadden 1998

Sister taxa: Astrohippus, Dinohippus, Equus, Heteropliohippus, Hippidion, Onohippidium, Parapliohippus, Pliohippus, Protohippus

Subtaxa: Calippus castilli, Calippus cerasinus, Calippus circulus, Calippus elachistus, Calippus hondurensis, Calippus maccartyi, Calippus martini, Calippus placidus, Calippus proplacidus, Calippus regulus

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Ecology: ground dwelling grazer