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Helaletidae
The Helaletidae is an extinct family of tapiroid Tapiroidea is a superfamily of perissodactyls which includes the modern tapir. Members of the superfamily are small to large browsing mammals, roughly pig-like in shape, with short, prehensile snouts. Their closest relatives are the other odd-toe ... closely related and likely ancestral to the true tapirs, which contain '' Protapirus'' and all descendants. In alternative classifications, the Helaletidae is treated as a subfamily within Tapiridae, the Helaletinae. Members of the family are defined by having less bilophodont cheek teeth compared to other tapiroids. References Prehistoric mammal families Odd-toed ungulates {{paleo-oddtoedungulate-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helaletes
''Helaletes'' is an extinct perissodactyl closely related to tapirs. Fossils have been found in North America. Taxonomy The type species of ''Helaletes'', ''H. nanus'', is known from Bridgerian-age fossils in the western US. ''Desmatotherium mongoliensis'' was previously referred to ''Helaletes'', but Bai et al. (2017) found it distantly related to the ''H. nanus'' type species, while excluding the nominal species ''H. medius'' Qiu, 1987 from Helaletidae.Bai B, Wang Y Q, Mao F Y et al., 2017. New material of Eocene Helaletidae (Perissodactyla, Tapiroidea) from the Irdin Manha Formation of the Erlian Basin, Inner Mongolia, China and comments on related localities of the Huheboerhe Area. Am Mus Novit, 3878: 1–44. References Prehistoric tapirs Eocene odd-toed ungulates Eocene mammals of North America Taxa named by Othniel Charles Marsh Fossil taxa described in 1872 {{paleo-oddtoedungulate-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paracolodon
''Paracolodon'' is an extinct genus of tapiroid perissodactyl belonging to the family Helaletidae. Fossils have been found in Mongolia and the Inner Mongolia Inner Mongolia, officially the Inner Mongolia Autonomous Region, is an autonomous region of the People's Republic of China. Its border includes most of the length of China's border with the country of Mongolia. Inner Mongolia also accounts for ... region of China. Taxonomy Matthew and Granger (1925) described the nominal tapiroid taxa ''Colodon inceptus'' and ''Paracolodon curtus'' from Eocene-age deposits in East Asia. Radinsky (1965) recognized two nominal species as identical and synonymized ''Paracolodon'' with ''Colodon inceptus''. Dashzeveg and Hooker (1997) assigned the nominal tapiroid species ''"Helalestes" fissus'' to ''Colodon'', as ''C. fissus'', based on similarities with ''inceptus''. On the basis of new material from the Erlian Basin in Inner Mongolia, Bai et al. (2017) recognized ''Paracolodon'' as a di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dilophodon
Tapiroidea is a superfamily of perissodactyls which includes the modern tapir. Members of the superfamily are small to large browsing mammals, roughly pig-like in shape, with short, prehensile snouts. Their closest relatives are the other odd-toed ungulates, including horses and rhinoceroses. Taxonomically, they are placed in suborder Ceratomorpha along with the rhino superfamily, Rhinocerotoidea. The first members of Tapiroidea appeared during the Early Eocene, 55 million years ago. Evolution and natural history The first tapirids, such as ''Heptodon'', appeared in the early Eocene. They appeared very similar to modern forms, but were about half the size, and lack the proboscis. The first true tapirs, appeared in the Oligocene, and by the Miocene, such genera as '' Miotapirus'' were almost indistinguishable to the extant species. It is believed that Asian and American tapirs diverged around 20 to 30 million years ago, and that tapirs migrated from North America and Centra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heptodon
''Heptodon'' is an extinct genus of tapir-type herbivore of the family Helaletidae endemic to North America during the Early Eocene. It lived from 50.3—48.6 mya, existing for approximately . ''Heptodon'' was about in length, and closely resembled modern tapirs. The shape of the skull suggests that it probably lacked the characteristic tapir trunk. Instead it probably had a slightly elongated, fleshy upper lip, like its relative '' Helaletes''. See also *Fossil Butte National Monument Fossil Butte National Monument is a United States National Monument managed by the National Park Service, located west of Kemmerer, Wyoming, United States. It centers on an assemblage of Eocene Epoch (56 to 34 million years ago) animal and ... References {{Taxonbar, from=Q2669763 Eocene odd-toed ungulates Eocene mammals of North America Taxa named by Edward Drinker Cope Fossil taxa described in 1882 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heteraletes
Tapiroidea is a superfamily of perissodactyls which includes the modern tapir. Members of the superfamily are small to large browsing mammals, roughly pig-like in shape, with short, prehensile snouts. Their closest relatives are the other odd-toed ungulates, including horses and rhinoceroses. Taxonomically, they are placed in suborder Ceratomorpha along with the rhino superfamily, Rhinocerotoidea. The first members of Tapiroidea appeared during the Early Eocene, 55 million years ago. Evolution and natural history The first tapirids, such as ''Heptodon'', appeared in the early Eocene. They appeared very similar to modern forms, but were about half the size, and lack the proboscis. The first true tapirs, appeared in the Oligocene, and by the Miocene, such genera as ''Miotapirus'' were almost indistinguishable to the extant species. It is believed that Asian and American tapirs diverged around 20 to 30 million years ago, and that tapirs migrated from North America and Central Ameri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eocene
The Eocene ( ) Epoch is a geological epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period in the modern Cenozoic Era. The name ''Eocene'' comes from the Ancient Greek (''ēṓs'', " dawn") and (''kainós'', "new") and refers to the "dawn" of modern ('new') fauna that appeared during the epoch. The Eocene spans the time from the end of the Paleocene Epoch to the beginning of the Oligocene Epoch. The start of the Eocene is marked by a brief period in which the concentration of the carbon isotope 13C in the atmosphere was exceptionally low in comparison with the more common isotope 12C. The end is set at a major extinction event called the ''Grande Coupure'' (the "Great Break" in continuity) or the Eocene–Oligocene extinction event, which may be related to the impact of one or more large bolides in Siberia and in what is now Chesapeake Bay. As with other geologic periods, the strata that define the start and e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miocene
The Miocene ( ) is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recent" because it has 18% fewer modern marine invertebrates than the Pliocene has. The Miocene is preceded by the Oligocene and is followed by the Pliocene. As Earth went from the Oligocene through the Miocene and into the Pliocene, the climate slowly cooled towards a series of ice ages. The Miocene boundaries are not marked by a single distinct global event but consist rather of regionally defined boundaries between the warmer Oligocene and the cooler Pliocene Epoch. During the Early Miocene, the Arabian Peninsula collided with Eurasia, severing the connection between the Mediterranean and Indian Ocean, and allowing a faunal interchange to occur between Eurasia and Africa, including the dispersal of proboscideans into Eurasia. During the la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colodon
''Colodon'' is an extinct genus of herbivorous mammals that were related to tapirs of today.L. T. Holbrook. 1999. The Phylogeny and classification of tapiromorph perissodactyls (Mammalia). Cladistics 15(3):331-350 . Alroy/J. Alroy/M. Uhen/ref> Taxonomy Species of ''Colodon'' were originally placed within the genus ''Lophiodon'' but were later found to be distinct. Description ''Colodon'' had small or absent canines and short, broad cheek teeth. The skull had a greatly enlarged narial incision and greatly reduced nasals. Similarities between the skulls of ''Colodon'' and true tapirs suggest it may have had a very small trunk as well. ''Colodon'' first appeared in the Late Eocene and lasted until the Whitneyan The Whitneyan North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology (NALMA), typically set from 33,300,000 to 30,800,000 years BP, a period of . It is usuall .... References P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thuliadanta
''Thuliadanta'' is an extinct genus of ceratomorph perissodactyl closely related to modern tapirs that is known from the early Eocene Margaret Formation of Arctic Canada (Nunavut and Northwest Territories). Paleogeographic significance ''Thuliadenta'' is known from the highest northern latitudinal region of any extinct tapiroid, indicating a possible North American origin for Tapiroidea. Judging from the use of the mountain tapir The mountain tapir, also known as the Andean tapir or woolly tapir (''Tapirus pinchaque'') is the smallest of the four widely recognized species of tapir. It is the only one to live outside of tropical rainforests in the wild. It is most easil ... as an analogue, ''Thuliadanta'' may have been a year-round inhabitant in the mild temperate lowland forests of the Eocene High Arctic.J. J. Eberle. 2005. A new 'tapir' from Ellesmere Island, Arctic Canada - Implications for northern high latitude palaeobiogeography and tapir palaeobiology. Palaeogeography ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tapiridae
Tapirs ( ) are large, herbivorous mammals belonging to the family Tapiridae. They are similar in shape to a pig, with a short, prehensile nose trunk. Tapirs inhabit jungle and forest regions of South and Central America, with one species inhabiting Southeast Asia. They are one of three extant branches of Perissodactyla (odd-toed ungulates), alongside equines and rhinoceros. Only a single genus, '' Tapirus'' is currently extant. Tapirs migrated into South America during the Pleistocene epoch from North America after the formation of the Isthmus of Panama as part of the Great American Interchange. Tapirs were once widespread in North America until the arrival of humans at the end of the Late Pleistocene, around 12,000 years ago. Species There are four widely recognized extant species of tapir, all in the genus ''Tapirus'' of the family Tapiridae. They are the South American tapir, the Malayan tapir, Baird's tapir, and the mountain tapir. In 2013, a group of researchers said the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
