Monotypic prehistoric Artiodactyla genera

Syndyoceras is a small extinct genus of Artiodactyla, of the family Protoceratidae, endemic to central North America from the Miocene epoch (23.1—18.5 Ma), existing for approximately .

thumb|Xenokeryx cranial fossils Xenokeryx ("strange horn" in Greek) is an extinct genus of ruminant known from the Miocene of Europe. The type species, Xenokeryx amidalae, was recovered from central Spain and bears a unique T-shaped protrusion from the top of the head. The specific epithet amidalae is in reference to the character Padmé Amidala from the Star Wars films "due to the striking resemblance that the occipital appendage of Xenokeryx bears to one of the hairstyles that the aforementioned character shows in The Phantom Menace feature film."

Euceratherium, also called the shrubox, is an extinct genus of ovibovine caprine known from the Pleistocene of North America and China. Two species have been proposed: the type species Euceratherium collinum named in 1904, and a second species Euceratherium bizzelli, named in 1937. Some researchers have expressed that the differences between these species may actually be individual variation, or variation within a single species.

Birgerbohlinia is an extinct genus of Giraffidae. It was first named by Crusafont Pairó and Villalta in 1951 and was found in Crevillente-2 (Alicante, Spain).

Vishnutherium (Vishnu's beast) is an extinct genus of the Giraffidae from the Miocene epoch. The genus contains two species, V. iravadicum and V. priscillum, discovered from Myanmar, Iran, Pakistan and possibly India.

Osbornoceros is an extinct artiodactyl genus of the family Antilocapridae. All antilocaprid species are extinct except for the pronghorn. Osbornoceros osborni is the only known species of the genus Osbornoceros. Osbornoceros lived during the Late Miocene around 7 to 6 million years ago in what is now North America. It is well represented in fossil discoveries, with nearly a dozen specimens having been found to date. All come from the Chamita Formation in a quarry near Lyden, New Mexico, the site of numerous other finds such as that of Chamitataxus, a prehistoric badger that lived at the same t

Mitilanotherium is an extinct genus of giraffes from the Pliocene and Pleistocene of Europe.

Dromomeryx is an extinct genus of Artiodactyla, of the family Dromomerycidae, endemic to North America. left|thumb|D. borealis skull thumb|left|Restoration of Aepycamelus and Dromomeryx (background)|266x266px == References ==

Gagadon ("Gaga tooth") is an extinct genus of even-toed ungulate that lived in the early Eocene of North America. The type and only known species, Gagadon minimonstrum, was described in 2014 based on lower teeth and jaw fragments found in the Wasatch Formation of Bitter Creek, Wyoming. The genus is named in honor of the singer Lady Gaga, while the species name minimonstrum ("mini monster") refers simultaneously to the small size and presence of unusual cusps on the teeth and to Gaga's name for her fans, the "little monsters".

Paraentelodon is an extinct entelodont from the Late Oligocene of Asia. The fossils of the type species P. intermedium were found in Georgia, Kazakhstan and China. An indeterminate species represents in Bugti Hills which is the late Oligocene of Pakistan.

Morenelaphus is an extinct genus of capreoline deer that lived in South America during the Pleistocene, ranging from the Pampas to southern Bolivia and Northeast Brazil. There is only a single recognised species, Morenelaphus brachyceros. It was a large deer, with some specimens estimated to exceed 200 kilograms in body mass. The antlers were over 70 cm in length, and are superficially similar those of deer belonging to the subfamily Cervinae, like red deer. Fossils of the genus have been recovered from the Agua Blanca, Fortín Tres Pozos and Luján Formations of Argentina, the Ñuapua Formation

Ampelomeryx is a genus of extinct herbivorous even-toed ungulate mammals belonging to the family Palaeomerycidae.

Eulamaops is an extinct genus of camelid belonging to the tribe Lamini, endemic to South America during the Pleistocene (Lujanian, 781,000—12,000 years ago), existing about . Fossil remains of Eulamaops have been found in the Luján Formation in Argentina in areas that would have been open grass and shrub land. It is estimated to have weighed 150 kilograms

Makapania is an extinct genus of large caprine or ovibovine from the Pliocene and Pleistocene of southern and East Africa. It is remarkable in that its horns were positioned laterally. Its body weight is estimated to have been about 263 kg.

Surameryx is an extinct genus of herbivorous artiodactyls originally described as belonging to the extinct family Palaeomerycidae. A single species, S. acrensis, was described from the Late Miocene (between the Mayoan and Huayquerian SALMA, between 11.6 and 5.3 million years ago) of the Madre de Dios Formation, South America. It was originally interpreted as one of the few northern mammals that entered South America before the Pliocene. However, both its identification as a member of the family Palaeomerycidae and claims about its Miocene age were subsequently challenged.

Kyptoceras was a small extinct artiodactyl ungulate mammal of the family Protoceratidae, endemic to southeastern North America from the Miocene to Early Pliocene epoch 23.03—3.6 Ma, existing for approximately . The species name, amatorum, comes in honor of all amateur fossil collectors, including Frank Garcia (Ruskin, Florida) the amateur who found it and donated it to the Florida Museum of Natural History.

Merriamoceros is an extinct genus of pronghorn. It is known from a single species, which is also the type species, M. coronatus.

Discokeryx is an extinct genus of even-toed ungulates, possibly related to the modern giraffe and okapi. D. xiezhi was alive during the Early Miocene period 17–16.9 million years ago. Fossilized remains of this animal were discovered in the Halamagai Formation located in northwest China. This species is known for their thick skulls and stumpy necks used for fighting other male D. xiezhi.

Archaeomeryx is an extinct genus of ruminant that lived early in the Eocene. It is believed to be close to the ancestry of the group Pecora, which includes deer, giraffes, cows and their relatives. Unlike the modern members of this group, it had a set of functioning incisors in the upper jaw. It was small in size, comparable to a modern-day mouse deer. It was also very rabbit-like and had several distinctive characteristics. It lived in present-day China 35 to 40 million years ago.

Haploidoceros is an extinct genus of deer that lived in Europe from the late Middle Pleistocene to early Late Pleistocene. It contains a single species, '''Haploidoceros mediterraneus.''' It had a distribution limited to southern France and the Iberian Peninsula.

Skinnerhyus shermerorum is an extinct peccary species from the late Miocene of Nebraska, United States. It had comparatively enormous, wing-like cheekbones.

Alforjas is an extinct genus of camelid, endemic to North America. They lived during the Late Miocene 10.3—5.3 mya existing for approximately .

Trigenicus is an extinct genus of small artiodactyl in the family Protoceratidae, endemic to North America. It lived from the Late Eocene 37.2—33.9 Ma, existing for approximately . Trigenicus resembled deer, but were more closely related to camelids.

Bootherium (Greek: "ox" (boos), "beast" (therion)) is an extinct bovid genus from the Middle to Late Pleistocene of North America which contains a single species, Bootherium bombifrons. Vernacular names for Bootherium include '''Harlan's muskox, woodox, woodland muskox, helmeted muskox, or bonnet-headed muskox'''.

Canthumeryx is an extinct genus of primitive giraffid artiodactyls. It is the close ancestor of giraffes.

Subdromomeryx is an extinct genus of Artiodactyla, of the family Palaeomerycidae, endemic to North America.

Toromeryx is a medium-sized extinct genus of Artiodactyla, of the family Protoceratidae, endemic to southwestern North America from the Eocene epoch (Late Uintan stage) 46.2—42 Ma, existing for approximately .

Floridachoerus olseni is an extinct peccary that lived during the Hemingfordian age of the Early Miocene, and was endemic to North America. F. olseni was in existence for approximately . Remains of this extinct mammal were located at the fossil rich Thomas Farm site in Gilchrist County, Florida (two collections) and Toledo Bend site, Newton County, Texas. Floridachoerus olseni was named after Stanley. J. Olsen of the Florida Geological Survey in 1962. Olsen previously worked at the site for Harvard University.

thumb|left|Restoration of a Procranioceras. Procranioceras is an extinct genus of artiodactyl belonging to the family Dromomerycidae, which was endemic to North America. It lived during the Middle Miocene, 16.0—13.6 Ma, existing for approximately . Fossils have been found from Florida, Saskatchewan, and Nebraska.