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Propalaeocastor
''Propalaeocastor'' is a poorly known extinct genus of beavers (family Castoridae) from the early Oligocene of Europe and Asia. Recently described material of a new species of ''Propalaeocastor'', ''P. irtyshensis'', indicates the genus is probably the earliest known member of the subfamily Castorinae, which includes all castorids more closely related to living beavers (genus ''Castor'') than to the extinct giant beaver (genus ''Castoroides''). Previously, ''Propalaeocastor'' had been allied with more basal beavers such as ''Agnotocastor'' and ''Anchitheriomys''.Korth W.W., 2002. Comments on the systematics and classification of the beavers (Rodentia, Castoridae). ''Journal of Mammalian Evolution'' 8(4):279-296. According to Wu and coauthors, ''Propalaeocastor'', specifically ''P. butselensis'', is the likely ancestor of the better-known Eurasian castorine ''Steneofiber ''Steneofiber'' is an extinct genus of beavers from the Miocene. They contain several species of beavers. A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Steneofiber
''Steneofiber'' is an extinct genus of beavers from the Miocene. They contain several species of beavers. Amongst them are ''S.barbouri'', ''S.complexus'', ''S.depereti'', ''S.fossor'', ''S.gradatus'', and ''S.hesperus''. Their various species are found all the way from the eastern end of the Iberian peninsula to southern Japan. ''S.depereti'' has been found in northwest Germany.https://typeset.io/pdf/the-castorid-steneofiber-from-nw-germany-and-its-39s16p2icl.pdf These small, 30-cm-long (1-ft-long) creatures probably lived in large freshwater lakes, like present day beavers. A semiaquatic lifestyle is indicated by the presence of combing-claws, which living beavers use to waterproof their fur. Most likely, it was incapable of bringing down trees like its modern relatives. ''Steneofibers'' were more terrestrial than modern beavers, living in burrows, but fossils are still found near ancient water sources. The finding of a possible family group of ''Steneofiber'' skeletons i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Castoridae
The family Castoridae contains the two living species of beavers and their fossil relatives. A highly diverse group of rodents within this family once roamed the earth, but only a single genus is extant today, '' Castor''. Characteristics Castorids are medium-sized mammals, although large compared with most other rodents. They are semiaquatic, with sleek bodies and webbed hind feet, and are more agile in the water than on land. Their tails are flattened and scaly, adaptations that help them manoeuvre in the water. Castorids live in small family groups that each occupy a specific territory, based around a lodge and dam constructed from sticks and mud. They are herbivores, feeding on leaves and grasses in the summer, and woody plants such as willow in the winter. They have powerful incisors and the typical rodent dental formula: Evolution The earliest castorids belong to the genus ''Agnotocastor'', known from the late Eocene and Oligocene of North America and Asia. Othe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oligocene
The Oligocene ( ) is a geologic epoch of the Paleogene Period and 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 the Ancient Greek (''olígos'', "few") and (''kainós'', "new"), and refers to the sparsity of extant forms of 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 changes during the Oligocene included a global expansion o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eurasia
Eurasia (, ) is the largest continental area on Earth, comprising all of Europe and Asia. Primarily in the Northern and Eastern Hemispheres, it spans from the British Isles and the Iberian Peninsula in the west to the Japanese archipelago and the Russian Far East to the east. The continental landmass is bordered by the Atlantic Ocean and Africa to the west, the Pacific Ocean to the east, the Arctic Ocean to the north, and by Africa, the Mediterranean Sea, and the Indian Ocean to the south. The division between Europe and Asia as two continents is a historical social construct, as many of their borders are over land; thus, in some parts of the world, Eurasia is recognized as the largest of the six, five, or four continents on Earth. In geology, Eurasia is often considered as a single rigid megablock. However, the rigidity of Eurasia is debated based on paleomagnetic data. Eurasia covers around , or around 36.2% of the Earth's total land area. It is also home to the largest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oligocene Mammals Of Europe
The Oligocene ( ) is a geologic epoch of the Paleogene Period and 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 the Ancient Greek (''olígos'', "few") and (''kainós'', "new"), and refers to the sparsity of extant forms of 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 changes during the Oligocene included a global expansion o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oligocene Mammals Of Asia
The Oligocene ( ) is a geologic epoch (geology), epoch of the Paleogene Geologic time scale, Period and 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 the 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oligocene Rodents
The Oligocene ( ) is a geologic epoch of the Paleogene Period and 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 the Ancient Greek (''olígos'', "few") and (''kainós'', "new"), and refers to the sparsity of extant forms of 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 changes during the Oligocene included a global expansion of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prehistoric Beavers
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] |
Agnotocastor
''Agnotocastor'' is an extinct member of the beaver family Castoridae. Unlike its modern relative, this species took the place of muskrats in the rivers of North America during the Oligocene The Oligocene ( ) is a geologic epoch of the Paleogene Period and 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 ... epoch. The earliest species is ''A. galushai'', which is also the first reliable member of the Castoridae.Emry, R. J. 1972A new species of ''Agnotocastor'' (Rodentia, Castoridae) from the early Oligocene of Wyoming.American Museum Novitates, no. 2485. References Prehistoric beavers Eocene rodents Oligocene rodents Prehistoric rodent genera Eocene mammals of Asia Oligocene mammals of Asia Eocene mammals of North America Oligocene mammals of North America {{paleo-rodent-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anchitheriomys
''Anchitheriomys'' is an extinct member of the beaver family, Castoridae. It inhabited North America and Eurasia during the middle Miocene. The name of the genus comes from ''Anchitherium'', an extinct genus of Equidae, horses, and the Greek language, Greek word for mouse, μῦς (''mys''), thus meaning "''Anchitheriums mouse", because the fossils of both genera usually co-occur. Until recently, ''Anchitheriomys'' was placed in a closely related family of rodents, the Eutypomyidae, but a partial skull shows similarities to another early beaver, ''Agnotocastor''.* References Prehistoric beavers Prehistoric rodent genera Oligocene rodents Prehistoric mammals of Europe {{paleo-rodent-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miklós Kretzoi
Miklós Kretzoi (9 February 1907 – 15 March 2005) was a Hungarian geologist, paleontologist and paleoanthropologist and Széchenyi Prize winner. Exhibition in the Hungarian National Museum, 9 February - 24 May 2004 Kretzoi studied Arts and natural sciences at the then Pázmány Péter University, Budapest from 1925 to 1929. While still a student, he worked as a volunteer at the Geological Institute of Hungary. In 1930 he graduated from the University of Pécs with a PhD in Palaeontology, Geology and Geography. In 1933 he commenced work with the "Hungarian-American Oil Inc" as a geologist and geophysicist. He remained at Hungarian-American Oil until the outbreak of the Second World War. Kretzoi moved to the National Museum of Hungary where he was curator of the Mineralogy and Paleontology departments until he began work at the Geological Institute of Hungary in 1950. Kretzoi was the director of the Geological Institute of Hungary from 1956 to 1958. From the mid-19 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Castoroides
''Castoroides'' (Latin: "beaver" (castor), "like" (oides)), or giant beaver, is an extinct genus of enormous, bear-sized beavers that lived in North America during the Pleistocene. Two species are currently recognized, ''C. dilophidus'' in the Southeastern US and ''C. ohioensis'' in the rest of its range. ''C. leiseyorum'' was previously described from the Irvingtonian of Florida, but is now regarded as an invalid name. All specimens previously described as ''C. leiseyorum'' are considered to belong to ''C. dilophidus''. Description Species of ''Castoroides'' were much larger than modern beavers. Their average length was approximately , and they could grow as large as . The weight of the giant beaver could vary from to . This makes it the largest known rodent in North America during the Pleistocene and the largest known beaver. Recent analyses suggest that they weighed less, closer to , but this is disputable. The hind feet of the giant beaver were much larger than in modern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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