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Protoreodon
''Protoreodon'' ("first ''Oreodon''") was a genus of Agriochoeridae, agriochoerid Merycoidodontoidea, merycoidodontoid from California, Texas, Utah and Wyoming.Fossilworks: Protoreodon parvus ''fossilworks.org''. Retrieved 2021-05-01. References Oreodonts Prehistoric Artiodactyla genera Paleogene mammals of North America {{paleo-eventoedungulate-stub ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Merycoidodontoidea
Merycoidodontoidea, previously known as "oreodonts" or "ruminating hogs," are an extinct Superfamily (taxonomy), superfamily of prehistoric cud-chewing artiodactyls with short faces and fang-like canine teeth. As their name implies, some of the better known forms were generally Domestic pig, hog-like, and the group has traditionally been placed within the Suina (Suinae, pigs, peccaries and their ancestors), though some recent work suggests they may have been more closely related to camels.Spaulding, M., O'Leary, M.A. & Gatesy, J. (2009): Relationships of Cetacea (Artiodactyla) Among Mammals: Increased Taxon Sampling Alters Interpretations of Key Fossils and Character Evolution. ''PLoS ONE'' no 4(9): e7062.article/ref> "Oreodont" means "mountain teeth," referring to the appearance of the Molar (tooth), molars. Most oreodonts were sheep-sized, though some genera grew to the size of cattle. They were heavy-bodied, with short even-toed ungulate, four-toed hoof, hooves and comparatively ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eocene
The Eocene ( ) is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (Ma). 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'', 'Eos, Dawn') and (''kainós'', "new") and refers to the "dawn" of modern ('new') fauna that appeared during the epoch.See: *Letter from William Whewell to Charles Lyell dated 31 January 1831 in: * From p. 55: "The period next antecedent we shall call Eocene, from ήως, aurora, and χαινος, recens, because the extremely small proportion of living species contained in these strata, indicates what may be considered the first commencement, or ''dawn'', of the existing state of the animate creation." 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 isoto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oligocene
The Oligocene ( ) is a geologic epoch (geology), epoch of the Paleogene Geologic time scale, Period that extends from about 33.9 million to 23 million years before the present ( to ). As with other older geologic periods, the rock beds that define the epoch are well identified but the exact dates of the start and end of the epoch are slightly uncertain. The name Oligocene was coined in 1854 by the German paleontologist Heinrich Ernst Beyrich from his studies of marine beds in Belgium and Germany. The name comes from Ancient Greek (''olígos'') 'few' and (''kainós'') 'new', and refers to the sparsity of Neontology, extant forms of Mollusca, molluscs. The Oligocene is preceded by the Eocene Epoch and is followed by the Miocene Epoch. The Oligocene is the third and final epoch of the Paleogene Period. The Oligocene is often considered an important time of transition, a link between the archaic world of the tropical Eocene and the more modern ecosystems of the Miocene. Major chang ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henry Fairfield Osborn
Henry Fairfield Osborn, Sr. (August 8, 1857 – November 6, 1935) was an American paleontologist, geologist and eugenics advocate. He was professor of anatomy at Columbia University, president of the American Museum of Natural History for 25 years and a cofounder of the American Eugenics Society. Among his significant contributions include naming the dinosaurs ''Tyrannosaurus'' and ''Velociraptor'', his widely used system of names for dental cusps of mammalian teeth, as well as his research on fossil proboscideans (elephants and their extinct relatives). Osborn was one of the most well known scientists in the United States during his own lifetime, “second only to Albert Einstein", and was a prominent public advocate for the existence of evolution. Active during the eclipse of Darwinism, Osborn was a prominent opponent of natural selection as a mechanism of evolution, favouring the now discredited orthogenesis theory of which he was one of the most prominent advocates. In a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oreodon
''Merycoidodon'' (" ruminating teeth") is an extinct genus of herbivorous artiodactyl of the family Merycoidodontidae, more popularly known by the name ''Oreodon'' ("hillock teeth"). It was endemic to North America during the Middle Eocene to Middle Miocene (46—16 mya) existing for approximately . Taxonomy Most researchers in paleobiology and paleontology now use the antecedent genus ''Merycoidodon'' to refer to this Oligocene epoch oreodont, even though it was once widely known by the younger synonym of ''Oreodon''. Taxonomically speaking, ''Merycoidodon'' belongs to the family Merycoidodontidae (once known as "Oreodontidae"), a group of artiodactyls related to camels that were endemic to North America. Its ancestors date back to the Eocene and its last descendants are known from the end of the Miocene, so that oreodonts, broadly speaking, lived throughout most of the Paleogene. Morphology ''Merycoidodon'' would have somewhat resembled a pig in appearance, but had a lo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oreodonts
This category contains all articles concerning the extinct North American artiodactyl Artiodactyls are placental mammals belonging to the order Artiodactyla ( , ). Typically, they are ungulates which bear weight equally on two (an even number) of their five toes (the third and fourth, often in the form of a hoof). The other t ...s known as " oreodonts". Prehistoric Artiodactyla Prehistoric Artiodactyla of North America Tylopoda ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prehistoric Artiodactyla Genera
Prehistory, also called pre-literary history, is the period of human history between the first known use of stone tools by hominins 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 years ago. It took thousands of years for writing systems to be widely adopted, with writing having spread to almost all cultures by the 19th century. The end of prehistory therefore came at different times in different places, and the term is less often used in discussing societies where prehistory ended relatively recently. It is based on an old conception of history that without written records there could be no history. The most common conception today is that history is based on evidence, however the concept of prehistory hasn't been completely discarded. In the early Bronze Age, Sumer in Mesopotamia, the Indus Valley Civilis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
