Clarendonian

Teleoceras is an extinct genus of rhinocerotid endemic to North America during the Neogene (Miocene and Pliocene). The name Teleoceras is derived from Greek: "perfect" (teleos) & "horn" (keratos).

Pliohippus (from Ancient Greek πλείων (pleíon), meaning "more", and ἵππος (híppos), meaning "horse") is an extinct genus of Equidae, the horse family. Pliohippus arose in the middle Miocene, around 15 million years ago. The long and slim limbs of Pliohippus reveal a quick-footed steppe animal. While some specimens have one toe per leg, others have three (the main toe and two non-functional side toes).

Ceratogaulus is an extinct genus of rodents, a member of the extinct fossorial (burrowing) rodent family Mylagaulidae. Ceratogaulus is one of two rodent genera with horns (along with fellow mylagaulid Mylagaulus) and is the smallest known horned mammal. Ceratogaulus lived in North America from the late Miocene to the early Pliocene epochs, 16.3 to 5.3 million years ago. Ceratogaulus (and to a lesser extent Mylagaulus) have sometimes been nicknamed "horned gophers", though they are only distantly related to true gophers.

The genus Leptocyon (Greek: leptos slender + cyon dog) includes 11 species and is the oldest known canine. They were small and weighed around . They first appeared in North America around 34 million years ago in the Oligocene, at the same time as the Borophaginae, with whom they share features, indicating that these were two sister groups. Borophaginae skull and dentition were designed for a powerful killing bite compared with the Leptocyon which were designed for snatching small, fast-moving prey. The species L. delicatus is the smallest canid to have existed. At the close of their genus 9 mi

Hypohippus (Greek: "under" (hypos), "horse" (hippos)) is an extinct genus of three-toed horse, which lived 17–11 million years ago. It was the largest anchitherine equid about the size of a modern domestic horse, at and long. It was a long-necked, high-shouldered browser with sub-hypsodont, lophodont (rhino-like) dentition, that fed on the tough vegetation of forest understory and shrubs. Its deep preorbital fossae and retraction of the nasal notch hint at the presence of a long, muscular and prehensile upper lip that would aid during selective browsing. Overall its ecology would have been mor

Aelurodon is an extinct canid genus of the subfamily Borophaginae which lived from the Barstovian land mammal age () of the middle Miocene to the late Miocene epoch (). Aelurodon existed for approximately .

left|thumb|188x188px|Mummified Procamelus head Procamelus is an extinct genus of camel endemic to North America. It lived from the Middle to Late Miocene 16.3—5.3 mya, existing for approximately . The name is derived from the Greek πρό, meaning "before" or denoting priority of order, and κάμελος ("camel"), thus meaning "fore-camel", "early camel" or "predecessor camel".

Protohippus is an extinct three-toed genus of horse. It was roughly the size of a modern donkey. Fossil evidence suggests that it lived during the Late Miocene (Clarendonian to Hemphillian), from about 13.6 Ma to 5.3 Ma.

Protolabis is an extinct genus of camelid endemic to North America. It lived from the Early to Late Miocene 20.4—5.3 mya, existing for approximately . Fossil distribution is widespread from Nicaragua, Central America to Montana and throughout the western U.S.

Paratoceras is an extinct genus of Artiodactyla, of the family Protoceratidae, endemic to North America. They lived during the Early to Middle Miocene, 20.4—10.3 Ma, existing for approximately . Paratoceras resembled deer, but were probably more closely related to chevrotains. In addition to having horns on the top of the head, they had a third horn on the snout.

thumb|left|Restoration by Charles R. Knight upright|thumb|left|Mare and foal at Ashfall Fossil Beds Neohipparion (Greek: "new" (neos), "pony" (hipparion)) is an extinct genus of equid, from the Neogene (Miocene to Pliocene) of North America and Central America.

Ischyrocyon is an extinct genus of amphicyonids that inhabited North America during the Late Miocene. It lived ~13.6—10.3 Ma ago, existing for approximately .

Merychyus is an extinct genus of oreodont of the family Merycoidodontidae, endemic to North America. It lived during the Miocene, 20.4—10.3 mya, existing for approximately . Fossils are widespread through the central and western United States.

genus of mammals

Cranioceras is an extinct genus of artiodactyl from the Miocene to the Pliocene in the United States.

Pseudhipparion is an extinct genus of three-toed horse endemic to North America during the early to late Miocene. They were herding animals whose diet consisted of C3 plants, implying that they were grazers. Fossils of Pseudhipparion have been found in Georgia, Florida, Oregon, Montana, Kansas, Texas, Nebraska, and South Dakota indicate that it was a lightweight horse, weighing up to 90 pounds (40 kilograms). In 2005, fossils were unearthed in Oklahoma. Seven species of Pseudhipparion are known from the fossil record, which were very small, following the trend of Bergmann's rule.

Piscobalaena is an extinct genus of cetaceans, which lived from the Middle to Late Miocene epochs (about 11.6 to 5.3 million years ago) in Peru and Florida. Its fossils have been found in the Pisco Formation of Peru and the Bone Valley Formation of Florida. At least some individuals of this diminutive whale were preyed on by the shark O. megalodon.

Megapaloelodus is an extinct genus of stem flamingo of the family Palaelodidae. Megapaloelodus is primarily known from Miocene America, from South Dakota and Oregon in the north to Argentina in the south, but the species Megapaloelodus goliath was found in Europe. Additionally, one unnamed species was discovered in Miocene sediments from Namibia. Due to a lack of skull material, little can be said about the ecology of Megapaloelodus. Species of this genus are typically larger than those of Palaelodus and appear to have inhabited similar brackish lake environments. Additionally, they may have b