Monotypic prehistoric carnivoran genera

Dinictis is a genus of the Nimravidae, an extinct family of feliform mammalian carnivores, also known as "false saber-toothed cats". Assigned to the subfamily Nimravinae, Dinictis was endemic to North America from the Late Eocene to Early Oligocene epochs (35.7—29.5 million years ago), existing for about . Including supplementary materials

Puijila darwini is an extinct species of stem-pinniped (seal) which lived during the Miocene about 21 to 24 million years ago. About a metre (3 feet) long, the animal had only minimal physical adaptations for swimming. Unlike modern pinnipeds, it did not have flippers and its shape was otter-like, albeit more specialized; its skull and teeth are the features that most clearly indicate that it is a seal.

Xenosmilus (from Ancient Greek ξένος (xénos), meaning "strange", and σμίλη (smílē), meaning "knife, chisel") is an extinct genus of homotherin machairodontine felid (saber-toothed cat) that roamed the North America from the Early Pleistocene. The type species of the genus, X. hodsonae, is known from Early Pleistocene deposits in Florida.

left|thumb|A. eximia skull, National Natural History Museum of China Adcrocuta is an extinct genus of large hyena that lived in Africa and Eurasia during the Miocene epoch.

Acrophoca longirostris, also known as the swan-necked seal, is an extinct genus of Late Miocene pinniped. It was thought to have been the ancestor of the modern leopard seal; however, it is now thought to be a species of monk seal.

Chamitataxus is a prehistoric badger genus. Chamitataxus avitus is the only known species of the genus. Chamitataxus lived during the Late Miocene, around 6 million years ago in what is now North America. Out of the three taxidiine badger genera to have existed on the continent, Chamitataxus is the most primitive. Very few taxideine badger remains have been uncovered to date, with only prehistoric Taxidea and Pliotaxidea specimens being discovered prior to the Chamitataxus holotype being found.

Dinaelurus is a genus of the Nimravidae, an extinct family of feliform mammalian carnivores, also known as "false saber-toothed cats". Assigned to the subfamily Nimravinae, Dinaelurus was endemic to North America during the Oligocene epoch (32.6—27.2 mya), existing for approximately .'' Including supplementary materials''

Adelphailurus is an extinct genus of metailurin machairodontine (saber-toothed) cat that inhabited western North America during the middle Pliocene. It is monotypic, containing only the species Adelphailurus kansensis.

Ekorus ekakeran is a large, extinct mustelid mammal. Fossils, including largely complete skeletons, are known from the late Miocene of Kenya.

Maofelis cantonensis is an extinct basal nimravid from Late Eocene-aged Youganwo Formation of Maoming Basin, Guangdong Province, China.

Pristinailurus bristoli is a fossil species in the carnivoran family Ailuridae. It is well-represented in the Hemphillian-aged deposits at the Gray Fossil Site in Gray, Tennessee. It was significantly larger than the living Ailurus, but probably possessed a comparatively weaker bite. P. bristoli was sexually dimorphic, as males appeared to have been up to twice the size of females. == Anatomy == thumb|Bristols panda skeleton P. bristoli was likely adapted to terrestrial and some arboreal locomotion, with a generalist diet.

Rhizosmilodon is an extinct genus of saber-tooth cat of the subfamily Machairodontinae that lived during the Early Pliocene and was discovered in the U.S. state of Florida.

thumb|left|Life reconstruction of a pair of Tartarocyon cazanavei in their natural environment Tartarocyon is an extinct genus of Amphicyonidae, who lived during the late Middle Miocene. It was described after fossilized remains found in Sallespisse, France. Despite the scarceness of its fossil remains, being only known from the holotype mandible, its body mass has been estimated to be close to 200 kilograms, far from its closest relative, Cynelos, and making it one of the largest terrestrial predators of Miocene Europe. T. cazanavei is the only species included in the genus. The genus was nam

Guangxicyon is a medium-sized, extinct genus of amphicyonid carnivoran, or "bear dog," which inhabited southern China during the Late Eocene. It is notable for being the oldest member of its family known from Asia, and is characterized by a shortened face and atypical, bunodont dentition. It inhabited a subtropical forest shaped by monsoon climate not unlike the one present in the region where it was found today. Only a single species, Guangxicyon sinoamericanus, is known.

Paratomarctus is an extinct monospecific genus of the Borophaginae subfamily of canids native to North America. It lived from the Middle to Late Miocene, 16.3 – 5.3 mya, existing for approximately . It was about the size of a coyote, and was probably a generalised predator, without the specialised adaptations of most later borophagines.

Megalenhydris barbaricina is an extinct species of giant otter from the Late Pleistocene of Sardinia. It is known from a single partial skeleton, discovered in the Grotta di Ispinigoli near Dorgali, and was described in 1987. It was larger than any living otter, exceeding the size of South American giant otters (Pteronura), which can reach two meters in length. The species is one of four extinct otter species from Sardinia and Corsica. The others are Algarolutra majori, Lutra castiglionis and Sardolutra ichnusae. It is suggested to have ultimately originated from the much smaller European main

thumb|left|Restoration of foraging Gomphotaria pugnax with Dusignathus in foreground

Cyrnaonyx is an extinct genus of Lutrinae, otters from the Pleistocene. It was originally described by Helbing based on materials from France and he also attributed material from Corsica to it. The latter appeared to belong to another species and genus, Algarolutra majori. The only species of Cyrnaonyx is C. antiqua. It is known from the Pleistocene (Holsteinian to Eemian/Weichselian) of Europe: France, Germany, Netherlands, Southern England and probably Italy.

Ginsburgsmilus is an extinct genus of carnivorous mammal of the subfamily Barbourofelinae. This genus was endemic to Africa during the early Miocene. There is only one known specimen of Ginsburgsmilus napakensis, dated to 20-19 mya.

Adilophontes is an extinct monospecific genus of bear dogs, endemic to North America during the Oligocene to Miocene. It lived from 24.8 to 20.6 Ma, existing for approximately . Fossils have been found in Wyoming.

Sardolutra ichnusae is an extinct species of otter from the Late Pleistocene of Sardinia. It was originally described as Nesolutra ichnusae. It was a rather small species of otter, probably living in the sea. Among its characteristics is a relatively very large baculum, larger than in any living otter. The species probably evolved from a species of Lutra, maybe L. castiglionis.

Angelarctocyon is an extinct genus of Amphicyonidae (bear dog), which belongs to the order Carnivora.

Quercylurus is an extinct nimravid carnivora (or "false sabre-toothed cat") from the Early to Late Oligocene of France and Spain. Its fossils were found in Early Oligocene strata in Quercy. It is known with only one species Quercylurus major. Q. major was one of the largest nimravids ever known, as its fossils suggest it was similar in size to the modern-day lion.

Pliopedia pacifica is an extinct species of walrus found in what is now Central Valley, California, United States, which lived during the late Miocene. It was an amphibious carnivore.

Sunkahetanka is an extinct monospecific genus of the Hesperocyoninae subfamily of early canids native to North America. It lived during the Oligocene, 30.8—26.3 Ma, existing for approximately . In form, it was intermediate between the small Cynodesmus and the later Enhydrocyon, the first hypercarnivorous, "bone-cracking", canid.

Pratifelis is an extinct genus of feline that lived in North America during the middle Miocene period. It contains a single species, Pratifelis martini.

Gustafsonia is an extinct genus of carnivoran belonging to the family Amphicyonidae (a bear dog). The type species, Gustafsonia cognita, was described in 1986 by Eric Paul Gustafson, who originally interpreted it as a miacid and named it Miacis cognitus. It was subsequently considered to be the only species of the diverse genus Miacis that belonged to the crown-group Carnivora, within the Caniformia, and it was ultimately assigned to the family Amphicyonidae. The type specimen or holotype was discovered in Reeve's bonebed, western Texas, in the Chambers Tuff Formation in 1986. The University o

Stenailurus is an extinct genus of metailurin machairodontine (saber-toothed) cat from the Late Miocene (the Turolian, specifically) of Spain. It contains a single species, Stenailurus teilhardi . It was described based on a piece of maxilla in 1972.

thumb|left|Teeth

Algarolutra is an extinct endemic genus of otter from the Pleistocene of Corsica and Sardinia. The single species A. majori was originally attributed to the genus Cyrnaonyx and its type species C. antiqua, which was based on fossils from Corsica and also from mainland France. From mainland Europe, only lower dentition was known, whereas from Corsica and Sardinia only upper dentition was known. When a Cyrnaonyx antiqua fossil with both upper and lower dentition was found in England, it became clear that the species majori was too different to keep even in the same genus and the genus Algarolutr

Neotherium mirum is an extinct species of basal walrus. It was smaller than living forms and it did not have long tusks. Males were larger than females.

Tchadailurus is a genus of machairodontine felid from the late Miocene of Chad, Africa.

Pliophoca is an extinct genus of seal in the family Phocidae.

Oxetocyon ("beginning dog") is an extinct monospecific genus of the Borophaginae subfamily of canids native to North America. It lived during the Early Oligocene epoch, existing for approximately . Fossils have been found in Nebraska and South Dakota.

Rhizocyon ("root dog") is an early member of the subfamily Borophaginae, an extinct subgroup of canids that were endemic to western North America during the Oligocene epoch, living from ~31—24.5 Ma., existing for approximately .

Aivukus is an extinct genus of walrus from the Miocene.

Kanuites is an extinct genus of paradoxurine viverrid carnivore. It lived in Africa, during the Miocene epoch.

Pseudarctos is a member of the extinct family Amphicyonidae of terrestrial carnivores belonging to the suborder Caniformia, which inhabited Eurasia in the Middle Miocene subepoch 16.9—11.1 Ma, existing for approximately .

Philotrox is an extinct monospecific genus of the Hesperocyoninae subfamily of early canids native to North America. It lived during the Oligocene, 30.8—26.3 Ma, existing for approximately . In form, it was intermediate between the small Cynodesmus and the later Enhydrocyon, the first hypercarnivorous, "bone-cracking", canid.

Caedocyon ("fit for cutting dog") is an extinct monospecific genus of bone crushing canid which inhabited western North America during the Oligocene 30.8—20.6 Ma, existing for approximately .

Dinailurictis is an extinct nimravid carnivoran (or "false sabre-toothed cat") belonging to the subfamily Nimravinae. It was named in 1922, with subsequent material being recovered from Early to Late Oligocene deposits across France and Spain.

Monotherium is an extinct genus of phocid belonging to the subfamily Monachinae. It is known from fossils found in the middle to late Miocene of Belgium.

Callophoca is an extinct genus of earless seals from the late Miocene to early Pliocene of Belgium and the US Eastern Seaboard.

Nanosmilus is a nimravid from the Oligocene (Whitneyan to Arikareean stages) of Nebraska. As a member of Feliformia, it is related to the superficially similar-appearing true cats. As such, it and nimravid genera in general are often referred to as false saber-toothed cats. No larger than a small bobcat, it is the smallest known saber-toothed mammal currently recognized by science. It is most closely related to its fellow nimravid Eusmilus.

Jinomrefu is a fossil genus of barbourofelin containing a single species Jinomrefu lakwanza. It was described in 2020 based on fossils from the Paleogene-Neogene boundary locality at Nakwai, Kenya. ==References==

Kretzoiarctos is an extinct bear genus from the European Miocene. It consists of Kretzoiarctos beatrix, an ancestor of the extant giant panda.

Imagotaria is an extinct monotypic genus of walrus with the sole species Imagotaria downsi. Fossils of Imagotaria are known from the early late Miocene of California (c. 10-12 million years ago).

Taotienimravus is an extinct genus of false saber tooth cats (Nimravinae) that lived in Eastern Asia during the middle Oligocene epoch. Currently only species in this genus is Taotienimravus songi making it a monotypic genus. Its lack of saber teeth and bone-cracking adaptations make Taotienimravus unique among Nimravidae.

Pangurban is an extinct genus of the family Nimravidae (the false saber-toothed cats), endemic to North America during the Eocene epoch (40–37 mya). It contains a single species, Pangurban egiae. Occurring several million years before other named nimravids in North America, the discovery of this species suggests that hypercarnivores evolved and spread quickly after the warm middle Eocene.

Nanodobenus is an extinct genus of pinniped that lived approximately 15.97 to 7.246 mya during the Miocene in what is now Baja California Sur, Mexico. It belonged to the family Odobenidae, the only extant species of which is the walrus. thumb|A map of the area where Nanodobenus fossils were discovered

Asiavorator (meaning "Asian devourer") is an extinct genus of civet-like carnivoran belonging in the family Stenoplesictidae. It was endemic to Asia and lived during the Eocene and Oligocene epochs.

Archaeodobenus is an extinct genus of pinniped that lived during the Late Miocene of what is now Japan. It belonged to the Odobenidae family, which is today only represented by the walrus, but was much more diverse in the past, containing at least 16 genera.

Nurocyon is an extinct member of the dog family (Canidae) from the Pliocene of Mongolia. Nurocyon chonokhariensis is the only species in the genus. The teeth of Nurocyon show adaptations to an omnivorous diet, comparable to the living raccoon dog (Nyctereutes procyonoides). The overall structure of the skull is similar to the more primitive Eucyon.

Oriensmilus is a fossil genus of barbourofelin containing a single species Oriensmilus liupanensis. It was described in 2020 based a nearly complete skull from the Middle Miocene-aged Tongxin Basin in northern China.

Pachypanthera is an extinct genus of pantherine felid (big cat) that was recovered from the Late Miocene-aged Khorat sand pits in northeastern Thailand. It contains a single species, Pachypanthera piriyai, named and described in 2023.

thumb | right | alt=Remains of a jaw, brownish in color, with dark brown teeth | Jaw of Protepicyon raki Protepicyon is an extinct monospecific genus of the Borophaginae subfamily of canids native to North America. It lived during the Barstovian stage of the Middle Miocene 16.0—13.6 mya. One of the top predators of its time, it was the probable ancestor of the better known Epicyon, and is known from remains in California and New Mexico.

Pelagiarctos was a genus of walrus that lived during the Middle Miocene, approx. 13-15 mya. Its fossilised remains have been found in the Sharktooth Hill Bonebed, in Kern County, California. It was originally described as an Otariidae, though it is now usually considered to be a basal Odobenidae.

Leptofelis is an extinct genus of Pseudaelurus-grade felid found in Spain.

Hemimachairodus is an extinct genus of machairodontine (sabre-toothed) cat with only one species, Hemimachairodus zwierzyckii, known from only a few fossils from the Pleistocene of Java. Other fossils attributed to Hemimachairodus sp. are known from the Villafranchian (late Pliocene to early Pleistocene) of Tajikistan.

Prohesperocyon ("before Hesperocyon") is an extinct genus of canid, endemic to North America appearing during the Late Eocene around 36.6 mya (AEO).