Hemingfordian

thumb|Daeodon shoshonensis life restoration thumb|Daeodon (Dinohyus) hollandi, complete skeleton from the Agate Fossil Beds National Monument|Agate Springs Fossil Quarry in Nebraska. See text for nomenclature history

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

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.

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.

Imagocnus is an extinct genus of ground sloth from the Early Miocene (Burdigalian) Lagunitas Formation of Cuba.

Panamacebus is an extinct genus of monkey known from the Early Miocene (Hemingfordian in the NALMA classification) of central Panama. Panamacebus transitus is the only and type species of this genus.

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