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Archaeotherium (Ancient Greek: αρχαιοθήριον, meaning "ancient beast") is an extinct genus of entelodont artiodactyl endemic to North America during the Eocene and Oligocene epochs (35–28 mya).
The order Artiodactyla consists of 349 extant species belonging to 132 genera. This does not include hybrid species or extinct prehistoric species. Modern molecular studies indicate that the 132 genera can be grouped into 23 families; these families are grouped into named suborders and many are further grouped into named clades, and some of these families are subdivided into named subfamilies.
Elomeryx is an extinct genus of artiodactyl ungulate, and is among the earliest known anthracotheres.The genus was extremely widespread, first being found in Asia in the middle Eocene, in Europe during the latest Eocene, and having spread to North America by the early Oligocene. [1]
Painting from around 1920 Modern restoration of Merycoidodon culbertsoni. Merycoidodon would have somewhat resembled a pig in appearance, but had a longer body, at about 1.4 metres (4.6 ft), and short limbs.
Extinction of taxa is difficult to confirm, as a long gap without a sighting is not definitive, but before 1995 a threshold of 50 years without a sighting was used to declare extinction. [ 1 ] One study found that extinction from habitat loss is the hardest to detect, as this might only fragment populations to the point of concealment from humans.
Artiodactyla: c. 598 BC: Moose/elk: Alces alces: Artiodactyla: c. 5600 BP [35] *Siberian roe deer: Capreolus pygargus: Artiodactyla: 1945: Non-native, introduced in England from escapees in early 20th century; exterminated by 1945 [36] [37] Reindeer: Rangifer tarandus: Artiodactyla: c. 11,000 BP [38] Extirpated in Ireland c. 7500 BC. [39] [40 ...
Syndyoceras is a small extinct genus of Artiodactyla, of the family Protoceratidae, endemic to central North America from the Miocene epoch (24.8—20.6 Ma), existing for approximately [ 1 ] Taxonomy
Anthracotheriidae is a paraphyletic family of extinct, hippopotamus-like artiodactyl ungulates related to hippopotamuses and whales.The oldest genus, Elomeryx, first appeared during the middle Eocene in Asia.