Dinoceratans

Uintatherium is an extinct genus of dinoceratan mammal that lived during the Eocene epoch. Two species are currently recognized: U. anceps is found in the United States and lived during the early to middle Eocene (50.5–37 million years ago), while U. insperatus is found in China and lived during the middle and late Eocene (48–37 million years ago). The first fossils of Uintatherium were recovered from the Fort Bridger Basin and were initially believed to belong to a new species of brontothere. Several previously recognized species, as well as genera such as Edward Drinker Cope's Loxolophodon a

Dinocerata, from Ancient Greek (), "terrible", and (), "horn", or Uintatheria, is an extinct order of large herbivorous hoofed mammals with horns and protuberant canine teeth, known from the Paleocene and Eocene of Asia and North America. With body masses ranging up to they represent some of the earliest known large mammals.

Gobiatherium (from Gobi Desert, and Ancient Greek θηρίον (thēríon), meaning "beast") was one of the last uintatheriids, from the Mid Eocene of Mongolia.

Eobasileus ("dawn-king") is a genus of dinoceratan mammal in the family Uintatheriidae. One species is currently considered valid, E. cornutus, though it has been suggested that the closely related Tetheopsis may also belong to this genus. The first specimen of Eobasileus, consisting of a skull, several vertebrae, and bones associated with the limbs, was collected from Haystack Mountain, from strata belonging to the Washakie Formation. The species became the subject of various letters written by Edward Drinker Cope (its describer) and Othniel Charles Marsh, and their disagreements over its tax

Prodinoceras, from Ancient Greek πρό (pró), meaning "before", δεινός (deinós), meaning "terrible", and κέρας (kéras), meaning "horn", is the earliest known dinocerate genus, which lived in the late Paleocene of Mongolia.

Bathyopsis, from Ancient Greek βαθύς (bathús), meaning "thick", and ὄψις (ópsis), meaning "face", is an extinct genus of dinocerates. The genus is known from Eocene North America.

Tetheopsis is an extinct genus of dinocerates from Eocene North America. The name of the genus derives from the Greek "tethe" (meaning "grandmother") and "opsis" (meaning "appearance"). Tetheopsis has only been found in the Washakie Basin, with all specimens being found on or near Haystack Mountain.

Probathyopsis, from Ancient Greek πρό (pró), meaning "before", βαθύς (bathús), meaning "thick", and ὄψις (ópsis), meaning "face", is an extinct genus of dinocerate mammal from Paleocene North America.