Calippus (mammal)

Calippus is an extinct genus of hoofed mammals in the horse family (Equidae), known from the Middle Miocene through the Early Pliocene of North and Central America. Fossils have been found in the Central United States and the Eastern United States, ranging south to Honduras.^[1][2] These equines had high crowned teeth and a quadrangular, wide muzzle, and were small compared to their contemporary relatives,^[3] with C. elachistus weighing 49 kg, C. cerasinus weighing 102 kg,^[4] 132 kg for C. theristes and 73 kg for C. mccartyi.^[5]

Calippus Temporal range: Barstovian–Blancan ~16–1.8 Ma PreꞒ Ꞓ O S D C P T J K Pg N
C. placidus skull, American Museum of Natural History
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Perissodactyla
Family:	Equidae
Subfamily:	Equinae
Tribe:	Equini
Genus:	†Calippus Matthew & Stirton 1930
Type species
Calippus placidus (Leidy, 1858)
Species
C. martini Hesse 1936 C. regulus Johnston 1937