Teleoceras

Teleoceras Temporal range: Barstovian-Hemphillian ~15.97–4.9 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Specimen at the Natural History Museum of LA
1913 T. fossiger illustration by Robert Bruce Horsfall.
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Perissodactyla
Family:	Rhinocerotidae
Subfamily:	†Aceratheriinae
Genus:	†Teleoceras Hatcher, 1894
Type species
†Teleoceras major
Species[1]
†T. aepysoma †T. aginense †T. americanum †T. brachyrhinum †T. hicksi †T. fossiger †T. guymonense †T. major †T. medicornutum †T. meridianum †T. proterum
Synonyms
†Mesoceras (Cook, 1930)[2] †Paraphelops Lane, 1927[3]

Teleoceras (Greek: "perfect" (teleos), "horn" (keratos)^[4]) is an extinct genus of rhinocerotid. It lived in North America during the Miocene and Pliocene epochs during the Hemingfordian to the end of Hemphillian from around 17.5 to 4.9 million years ago.^[5][6] It grew up to lengths of 13 feet (4.0 meters) long.^[7]

Teleoceras went extinct in North America alongside Aphelops at the end of the Hemphillian, most likely due to rapid climate cooling, increased seasonality and expansion of C4 grasses, as isotopic evidence suggests that the uptake of C4 plants was far less than that in contemporary horses.^[6] The Gray Fossil Site in northeast Tennessee, dated to 4.5-5 million years ago, hosts one of the latest-known populations of Teleoceras, Teleoceras aepysoma.^[8]