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Microhyrax
''Microhyrax'' was a prehistoric genus of herbivorous hyrax-grouped mammal Mammals () are a group of vertebrate animals constituting the class Mammalia (), characterized by the presence of mammary glands which in females produce milk for feeding (nursing) their young, a neocortex (a region of the brain), fur or .... It lived during the Eocene period from 55.8 to 40.4 million years ago in modern-day Algeria. Cladogram A phylogeny of hyracoids known from the early Eocene through the middle Oligocene epoch. References Prehistoric hyraxes Fossil taxa described in 1979 Prehistoric placental genera {{paleo-afrotheria-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyracoidea
Hyraxes (), also called dassies, are small, thickset, herbivorous mammals in the order Hyracoidea. Hyraxes are well-furred, rotund animals with short tails. Typically, they measure between long and weigh between . They are superficially similar to pikas and marmots, but are more closely related to elephants and sea cows. Hyraxes have a life span from 9 to 14 years. Five extant species are recognised: the rock hyrax (''Procavia capensis'') and the yellow-spotted rock hyrax (''Heterohyrax brucei''), which both live on rock outcrops, including cliffs in Ethiopia and isolated granite outcrops called koppies in southern Africa; the western tree hyrax (''Dendrohyrax dorsalis''), southern tree hyrax (''D. arboreus''), and eastern tree hyrax (''D. validus''). Their distribution is limited to Africa, except for ''P. capensis'', which is also found in the Middle East. Characteristics Hyraxes retain or have redeveloped a number of primitive mammalian characteristics; in particular, they ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pliohyracidae
Hyraxes (), also called dassies, are small, thickset, herbivorous mammals in the order Hyracoidea. Hyraxes are well-furred, rotund animals with short tails. Typically, they measure between long and weigh between . They are superficially similar to pikas and marmots, but are more closely related to elephants and sea cows. Hyraxes have a life span from 9 to 14 years. Five extant species are recognised: the rock hyrax (''Procavia capensis'') and the yellow-spotted rock hyrax (''Heterohyrax brucei''), which both live on rock outcrops, including cliffs in Ethiopia and isolated granite outcrops called koppies in southern Africa; the western tree hyrax (''Dendrohyrax dorsalis''), southern tree hyrax (''D. arboreus''), and eastern tree hyrax (''D. validus''). Their distribution is limited to Africa, except for ''P. capensis'', which is also found in the Middle East. Characteristics Hyraxes retain or have redeveloped a number of primitive mammalian characteristics; in particular, th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyrax
Hyraxes (), also called dassies, are small, thickset, herbivorous mammals in the order Hyracoidea. Hyraxes are well-furred, rotund animals with short tails. Typically, they measure between long and weigh between . They are superficially similar to pikas and marmots, but are more closely related to elephants and sea cows. Hyraxes have a life span from 9 to 14 years. Five extant species are recognised: the rock hyrax (''Procavia capensis'') and the yellow-spotted rock hyrax (''Heterohyrax brucei''), which both live on rock outcrops, including cliffs in Ethiopia and isolated granite outcrops called koppies in southern Africa; the western tree hyrax (''Dendrohyrax dorsalis''), southern tree hyrax (''D. arboreus''), and eastern tree hyrax (''D. validus''). Their distribution is limited to Africa, except for ''P. capensis'', which is also found in the Middle East. Characteristics Hyraxes retain or have redeveloped a number of primitive mammalian characteristics; in particular, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eocene
The Eocene ( ) Epoch is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), 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 Carbon-13, 13C in the atmosphere was exceptionally low in comparison with the more common isotope Carbon-12, 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 Popigai impact structure, Siberia and in what is now ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prehistoric Hyraxes
Prehistory, also known as pre-literary history, is the period of human history between the use of the first stone tools by hominins 3.3 million years ago and the beginning of recorded history with the invention of writing systems. The use of symbols, marks, and images appears very early among humans, but the earliest known writing systems appeared 5000 years ago. It took thousands of years for writing systems to be widely adopted, with writing spreading to almost all cultures by the 19th century. The end of prehistory therefore came at very different times in different places, and the term is less often used in discussing societies where prehistory ended relatively recently. In the early Bronze Age, Sumer in Mesopotamia, the Indus Valley Civilisation, and ancient Egypt were the first civilizations to develop their own scripts and to keep historical records, with their neighbors following. Most other civilizations reached the end of prehistory during the following Iron Age. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phenacodontidae
Phenacodontidae is an extinct family (biology), family of large herbivorous mammals traditionally placed in the “wastebasket taxon” Condylarthra, which may instead represent early-stage Perissodactyla, perissodactyls. They lived in the Paleocene and Eocene Epoch (geology), epochs (about 60–50 million years ago) and their fossil remains have been found in North America and Europe. Description These animals had a variety of body sizes, and could be as small as domestic cats (''Tetraclaenodon'' and ''Ectocion'') and as large as sheep (''Phenacodus''). The skull of phenacodontids is long and narrow, and equipped with a small braincase. The skeleton of phenacodontids show several primitive characteristics (the long and heavy tail for example) but also a number of advanced, Perissodactyla-like adaptations: Their long legs, for example, had five fingers, but the first finger showed a clear reduction, and in some forms (like ''Phenacodus'') the fifth finger was reduced as wel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geniohyus
''Geniohyus'' was a genus of herbivorous hyrax Hyraxes (), also called dassies, are small, thickset, herbivorous mammals in the order Hyracoidea. Hyraxes are well-furred, rotund animals with short tails. Typically, they measure between long and weigh between . They are superficially simil ...-grouped mammal. References Prehistoric hyraxes Prehistoric placental genera {{paleo-afrotheria-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Megalohyrax
''Megalohyrax'' is an extinct hyrax-grouped genus of herbivorous mammal that lived during the Miocene, Oligocene, and Eocene, about 55-11 million years ago. Its fossils have been found in Africa and in Asia Minor. Description This animal was very different from the current hyraxes and much larger, generally reaching the size of a tapir and sometimes exceeding in length. The legs were strong and the body very massive. The skull was long and low, unlike that of today's hyraxes, and could reach in length. Length of upper premolars and molars is and , respectively. The dental formula of ''Megalohyrax'' was composed of three incisors, one canine, four premolars and three molars. It likely had an eustachian tube. Classification and habitats It was first described by Andrews in 1903. The type species is ''Megalohyrax eocaenus'', was found in the El Fayum area in Egypt. Other fossils attributed to this kind have been found in Saudi Arabia and Ethiopia. See also * ''Titanohyrax'' * '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antilohyrax
''Antilohyrax'' was a genus of herbivorous mammal belonging to the order Hyracoidea. Fossils were found in 1983 in Egypt, 46 m above the bottom of the Jebel Qatrani Formation. The species ''Antilohyrax pectidens'' had an approximate weight of 33–35 kg. It had features not seen in other hyraxes, including a "broad hyper-pectinate comb-like first incisor" on its lower jaw, selenodont molars and a rostrum similar to that seen in even-toed ungulate The even-toed ungulates (Artiodactyla , ) are ungulates—hoofed animals—which bear weight equally on two (an even number) of their five toes: the third and fourth. The other three toes are either present, absent, vestigial, or pointing poster ...s. References Prehistoric hyraxes Prehistoric placental genera Eocene mammals of Africa Fossil taxa described in 2000 {{paleo-afrotheria-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Titanohyrax
''Titanohyrax'' is an extinct genus of large to very large hyrax from the Eocene and Oligocene. Specimens have been discovered in modern-day Algeria, Tunisia, Egypt and Libya. Some species, like ''T. ultimus'', are estimated to be as large as the modern rhinoceros. ''Titanohyrax'' species are still poorly known due to their rarity in the fossil record. ''Titanohyrax'' is unusual among the numerous Paleogene hyracoids by its lophoselenodont teeth (having teeth that are lophodont and selenodont, fully molariform premolars, and relatively high-crowned cheek teeth. This suggests the genus had a folivorous diet.Rasmussen, D. T., 1989. The evolution of the Hyracoidea: a review of the fossil evidence. In: Prothero, D.R., Schoch, R.M. (Eds.), The Evolution of Perissodactyls. Oxford University Press, New York, pp. 57-78. The genus was first described by in 1922 for the species ''T. ultimus'' from the early Oligocene of the Jebel Qatrani Formation, Fayum Depression, Egypt. The au ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
