Eocene Perissodactyla

Hyracotherium ( ; "hyrax-like beast") is an extinct genus of small (about 60 cm in length) perissodactyl ungulates that was found in the London Clay formation. This small, fox-sized animal is (for some scientists) considered to be the earliest known member of Equidae before the type species, H. leporinum, was reclassified as a palaeothere, a perissodactyl family related to both horses and brontotheres. The remaining species are now thought to belong to different genera, such as Eohippus, which had previously been synonymised with Hyracotherium.

Mesohippus (Greek: / meaning "middle" and / meaning "horse") is an extinct genus of early horse. It lived 37 to 32 million years ago in the Early Oligocene. Like many fossil horses, Mesohippus was common in North America. Its shoulder height is estimated at 60 cm.

Eohippus is an extinct genus of small equid ungulates. The only species is E. angustidens, which was long considered a species of Hyracotherium (now strictly defined as a member of the Palaeotheriidae rather than the Equidae). Its remains have been identified in North America and date to the Early Eocene (Ypresian stage).

Palaeotherium is an extinct genus of equoid that lived in Europe and possibly the Middle East from the Middle Eocene to the Early Oligocene. It is the type genus of the Palaeotheriidae, a group exclusive to the Palaeogene that was closest in relation to the Equidae, which contains horses plus their closest relatives and ancestors. Fossils of Palaeotherium were first described in 1782 by the French naturalist Robert de Lamanon and then closely studied by another French naturalist, Georges Cuvier, after 1798. Cuvier erected the genus in 1804 and recognized multiple species based on overall fossi

Hyrachyus (from Hyrax and "pig") is an extinct genus of perissodactyl mammal that lived in Eocene Europe, North America, and Asia. Its remains have also been found in Jamaica. It is closely related to Lophiodon.

Epihippus is an extinct genus of the modern horse family Equidae that lived in the Eocene, from 46 to 38 million years ago.

Orohippus (from the Greek , 'mountain' and , 'horse') is an extinct equid that lived in the Eocene (about 50 million years ago). Its fossils have been unearthed in Oregon, Colorado, Utah, and Wyoming.

Sifrhippus is an extinct genus of equid containing the species S. sandrae. Sifrhippus is the oldest known equid, living during the early Eocene. Its fossils were discovered in the Bighorn Basin of Wyoming.

Trigonias (Greek: "triangular" (trigonos), "ias" [denotes possession]) is an extinct genus of rhinocerotid from the late Eocene (Chadronian) some 35 million years ago of North America.

Heptodon is an extinct genus of tapir-type herbivore of the family Helaletidae endemic to North America during the Early Eocene. It lived from 50.3—48.6 mya, existing for approximately .

Lophiodon is an extinct genus of perissodactyls and the type genus of the Lophiodontidae, one of two major clades of the extinct suborder Ancylopoda. It, like the rest of the family, was endemic to western Europe and lived from the Early to Middle Eocene. Fossils of Lophiodon were first studied in 1804 when the French palaeontologist Georges Cuvier thought that they belonged to tapirs. After initially classifying the formally recognized species to Palaeotherium in 1812, Cuvier named the genus in 1822 based on the hill-like cusps on its molars. Many fossil species were named and assigned to Lop

Eotitanops ('dawn titan-face') is an extinct genus of brontothere native to North America and Asia.

thumb|Parsimony analyses consensus tree for phylogeny of anthracobunids from cladistic study by Cooper et al. (2014), showing them (near the bottom) placed within Perissodactyla next to [[Desmostylia.]]

Sphenocoelus is an extinct genus of brontothere known from North America and Asia during the Middle Eocene.

Protorohippus (Latin: "before" (pro), + Greek: "mountain" (oros), "horse" (hippos)) is an extinct genus of equid that lived in the Eocene of North America.

thumb|left|Restoration of Haplohippus (middle right) and other animals of the Hancock Mammal Quarry Haplohippus is an extinct genus of the modern horse family Equidae, that lived in the Eocene, from 42 to 38 million years ago. Fossil remains of Haplohippus have been found in the Clarno Formation, part of the John Day Fossil Beds National Monument of the Northwestern United States. While Haplohippus is quite similar to Orohippus, it is considered more primitive in character than Epihippus.

Homogalax (from the Greek "ὁμογάλαξ") is an extinct genus of tapir-like odd-toed ungulate. It was described on the basis of several fossil finds from the northwest of the United States, whereby the majority of the remains come from the state of Wyoming. The finds date to the Lower Eocene between 56 and 48 million years ago. In general, Homogalax was very small, only reaching the weight of today's peccaries, with a maximum of 15 kg. Phylogenetic analysis suggests the genus to be a basal member of the clade that includes today's rhinoceros and tapirs (collectively called Ceratomorpha). In c

thumb | right | Eomoropus anarsius Gazin, 1956 Eomoropidae is a family of odd-toed ungulates, a group which also includes horses, rhinoceroses, and tapirs. They were most closely related to the extinct chalicotheres, which they greatly resemble, and may have been their immediate ancestors. They were, however, much smaller than the later forms, being around the size of a sheep. Like their later relatives, they were probably browsers on leaves and other soft vegetation, and, unlike most other ungulates, had claws on their feet. The Eomoropidae is most likely a paraphyletic group within Chalicot

Rhinotitan (nose giant) is an extinct genus of brontothere from the Eocene of Mongolia, with two valid species, R. andrewsi and R. kaiseni. The genus included medium to large brontotheres which had long skulls with nasal horns. Like other solid-horned brontotheres, Rhinotitan was sexually dimorphic in horn size. In living mammals, this pattern is found in species that live in groups; males have the larger horns, and use them in ritualized combats with other males to decide control of territories that offer breeding access to females. Most horned brontotheres had dish-shaped skulls assumed to b

Duchesneodus is a large brontothere endemic to North America. It lived during the Late Eocene 40.4—37.2 mya, existing for approximately . The skeletal characteristic of the mammal was defined by the dome size that was sexually in two distinct forms. The females had a lower but prominent dome while the males had larger domes. Several species of Duchesneodus have been named historically, though only one is recognized as valid today, D. uintensis.

Mesatirhinus is a genus of brontothere endemic to North America during the Eocene living from 50.3 to 42 mya, existing for approximately .

genus of mammals (fossil)

Pliolophus is an extinct equid that lived in the Early Eocene of Britain.

Colodon is an extinct genus of herbivorous mammals that were related to tapirs of today.

Telmatherium is a genus of a North American brontothere. It lived during the Eocene epoch.

Protitanotherium is a genus of brontotheres native to North America during the middle Eocene. It contains one species, P. emarginatum, described in 1895 by the American paleontologist John Bell Hatcher.

Jozaria is an extinct genus of stem perissodactyl from the Early to Middle Eocene of the Kuldana Formation of Kohat, Pakistan. It and other anthracobunids were formerly classified with proboscideans.

Deperetella is an extinct genus of deperetellid perissodactyls from Middle to Late Eocene of Asia. The genus was defined in 1925 by W. D. Matthew and Walter W. Granger, who named it after French paleontologist Charles Depéret. The type species is Deperetella cristata.