Outgroup

Protohippus_perditus

Protohippus_supremus

Calippus_Calippus_placidus

Calippus_Grammohippus_martini

Pliohippus_mirabilis

Hippidion_saldiasi

Hippidion_devillei

Hippidion_principale

Dinohippus_interpolatus

Onohippidium_galushai

Dinohippus_leidyanus

Astrohippus_stocki

Dinohippus_mexicanus

Equus_simplicidens