Chilotherium

Chilotherium, from Ancient Greek χείλος (cheílos), meaning "lip", and θηρίον (theríon), meaning "beast", is an extinct genus of rhinocerotids that lived in Africa and Eurasia during the Miocene through Pliocene living for 13.7—3.4 mya, existing for approximately 10.3 million years. Chilotherium was named by Ringström in 1924. It was assigned to Rhinocerotidae by Carroll (1988); to Aceratheriini by Antoine and Saraç (2005); and to Chilotheriini by Deng (2005). Twelve species of Chilotherium have been described and 19 other species have been assigned the genus. Nine are considered valid: four from Europe, one from Iran, and four from China. Aprotodon differs from Chilotherium in its proportionally larger and wider symphysis; the horizontal mandibular ramus is curved both in side view and in dorsal view, unlike most rhinocerotids; and the premolars are semi-molariform, unlike the fully molariform premolars in Chilotherium. In Subchilotherium the mandibular symphysis is much more narrow than in Chilotherium. Acerorhinus has a strongly constricted nasal base and a mandibular symphysis that is narrow compared to that in Chilotherium. It was a large, robust animal reaching 1.5–1.8 m (4 ft 11 in – 5 ft 11 in) in height and a weight between 1 and 2.5 t (1.1 and 2.8 short tons; 2,200 and 5,500 lb), depending on the species. Both sexes are hornless.