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Megistotherium
''Megistotherium'' is an extinct genus of hyaenodont belonging to the family Hyainailouridae that lived in Africa and possibly Asia as well. It first appeared in Early Miocene to late Middle Miocene from 22.5 to 12.0 million years ago, existing for . Taxonomy The name of this genus comes and . The name of species ''Megistotherium osteothlastes'' comes and (with ''-es'' being an agent noun: 'bone-crusher'). The family Hyainailouridae comprised a diverse group of hyaenodont predators that were most successful during the Eocene before being possibly ecologically displaced by the order Carnivora during the late Oligocene. ''Megistotherium'' emerged in the Miocene towards the end of the hyaenodonts' flourishing; it was a part of a radiation of African hyaenodontids that occurred at that time. '' Hyainailouros sulzeri'' is very closely related to ''Megistotherium'', extremely similar in size, structure and ratios - with a long tail, short limbs and robust body. Other authorities ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Megistotherium Osteothlastes
''Megistotherium'' is an extinct genus of Hyaenodonta, hyaenodont belonging to the family Hyainailouridae that lived in Africa and possibly Asia as well. It first appeared in Early Miocene to late Middle Miocene from 22.5 to 12.0 million years ago, existing for . Taxonomy The name of this genus comes and . The name of species ''Megistotherium osteothlastes'' comes and (with ''-es'' being an agent noun: 'bone-crusher'). The family Hyainailouridae comprised a diverse group of hyaenodont predators that were most successful during the Eocene before being possibly ecologically displaced by the order Carnivora during the late Oligocene. ''Megistotherium'' emerged in the Miocene towards the end of the hyaenodonts' flourishing; it was a part of a radiation of African hyaenodontids that occurred at that time. ''Hyainailouros, Hyainailouros sulzeri'' is very closely related to ''Megistotherium'', extremely similar in size, structure and ratios - with a long tail, short limbs and robu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Hyainailouridae
Hyainailouridae ("hyena-like Felidae, cats") is a Paraphyly, paraphyletic family of extinct predatory mammals within the Polyphyly, polyphyletic superfamily Hyaenodonta, Hyainailouroidea within extinct order Hyaenodonta. Hyainailourids arose during the middle Eocene and persisted well into the middle Miocene. Fossils of this group have been found in Asia, Africa, North America and Europe. General characteristics Hyainailourids are characterized by long skulls, slender jaws, slim bodies, and a plantigrade stance. They generally ranged in size from 30 to 140 cm at the shoulder. While some measured as much as 1.4 m high at the shoulder with head-body length up to 3.2 m and weighed up to 500 kg, most were in the 5–15 kg range, equivalent to a mid-sized dog. The anatomy of their skulls show that they had a particularly acute sense of smell, while their teeth were adapted for shearing, rather than crushing. At least one hyainailourid lineage, Apterodontinae, was specia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Ngorora Formation
The Ngorora Formation is a geological formation in Kenya preserving fossils dating to the Miocene. The uppermost member of the formation shows sign of a faunal turnover that occurred around 11 to 10.5 million years ago, coinciding with faunal changes elsewhere in the world. This turnover includes the arrival of the horse ''Hipparion'' in East Africa. The Ngorora Formation was initially mapped by G.R. Chapman in collaboration with the East African Geological Research Unit (EAGRU) and formally described by Bishop & Chapman in 1970. Major fossil finds were made in the early 1970s, with expeditions to the area recovering thousands of mammal, fish and mollusc remains alongside less common fossil material of birds and reptiles. Geography The formation is bordered to the west by the Elgeyo Escarpment, the east by the Laikipia Plateau and to the north by the Tiati volcanic center. To the south the formation is limited by the rising floor of the rift. During its deposition the formation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Hyaenodonta
Hyaenodonta (" hyena teeth") is an extinct order of hypercarnivorous placental mammals of clade Pan-Carnivora from mirorder Ferae. Hyaenodonts were important mammalian predators that arose during the early Paleocene in Europe and persisted well into the late Miocene. Characteristics Hyaenodonts are characterized by long, often disproportionately large skulls, slender jaws, and slim bodies. They generally ranged in size from 30 to 140 cm at the shoulder. While '' Simbakubwa kutokaafrika'' may have been up to (surpassing the modern polar bear in size), this estimate is suspect due to being based on skull-body size ratios derived from felids, which have much smaller skulls for their body size. Other large hyaenodonts include two close and later-surviving relatives of ''Simbakubwa'', '' Hyainailouros'' and '' Megistotherium'' (the latter likely being the largest in the group), and the much earlier-living '' Hyaenodon gigas'' (the largest species from genus '' Hyaenodo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Hyainailouros
''Hyainailouros'' ("hyena-cat") is an extinct polyphyletic genus of hyaenodont belonging to the family Hyainailouridae that lived during the Early to Late Miocene, of which there were at least three species spread across Eurasia and Africa Africa is the world's second-largest and second-most populous continent after Asia. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth's land area and 6% of its total surfac .... Closely related to other large African hyaenodonts such as '' Simbakubwa'' and '' Megistotherium'', ''Hyainailouros'' walked with a semi-digitigrade stance and was probably capable of large, leaping bounds. References Hyaenodonts Miocene mammals of Europe Miocene mammals of Africa Miocene mammals of Asia Prehistoric placental genera Fossil taxa described in 1863 {{paleo-mammal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Europe
Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east. Europe shares the landmass of Eurasia with Asia, and of Afro-Eurasia with both Africa and Asia. Europe is commonly considered to be Boundaries between the continents#Asia and Europe, separated from Asia by the Drainage divide, watershed of the Ural Mountains, the Ural (river), Ural River, the Caspian Sea, the Greater Caucasus, the Black Sea, and the waterway of the Bosporus, Bosporus Strait. "Europe" (pp. 68–69); "Asia" (pp. 90–91): "A commonly accepted division between Asia and Europe ... is formed by the Ural Mountains, Ural River, Caspian Sea, Caucasus Mountains, and the Black Sea with its outlets, the Bosporus and Dardanelles." Europe covers approx. , or 2% of Earth#Surface, Earth's surface (6.8% of Earth's land area), making it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Shearing (physics)
In continuum mechanics, shearing refers to the occurrence of a shear strain, which is a deformation of a material substance in which parallel internal surfaces slide past one another. It is induced by a shear stress in the material. Shear strain is distinguished from volumetric strain. The change in a material's volume in response to stress and change of angle is called the angle of shear. Overview Often, the verb ''shearing'' refers more specifically to a mechanical process that causes a plastic shear strain in a material, rather than causing a merely elastic one. A plastic shear strain is a continuous (non-fracturing) deformation that is irreversible, such that the material does not recover its original shape. It occurs when the material is yielding. The process of shearing a material may induce a volumetric strain along with the shear strain. In soil mechanics, the volumetric strain associated with shearing is known as Reynolds' dilation if it increases the volume, o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Carnassial
Carnassials are paired upper and lower teeth modified in such a way as to allow enlarged and often self-sharpening edges to pass by each other in a shearing manner. This adaptation is found in carnivorans, where the carnassials are the modified fourth upper premolar and the first lower molar (tooth), molar. These teeth are also referred to as sectorial teeth. Taxonomy The name carnivoran is applied to a member of the order Carnivora. Carnivorans possess a common arrangement of teeth called carnassials, in which the first lower Molar (tooth), molar and the last upper premolar possess blade-like enamel Crown (tooth), crowns that act similar to a pair of shears for cutting meat. This dental arrangement has been modified by adaptation over the past 60 million years for diets composed of meat, for crushing vegetation, or for the loss of the carnassial function altogether found in pinnipeds. Carnassial dentition Carnassial teeth are modified molars (and in the case of carnivorans pre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Lethaia
''Lethaia'' is a quarterly peer-reviewed scientific journal of Earth science, covering research on palaeontology and stratigraphy. Now published by Scandinavian University Press, it was originally published by the International Commission on Stratigraphy. It is an official publication of the International Palaeontological Association and the International Commission on Stratigraphy. The journal had a 2012 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a type of journal ranking. Journals with higher impact factor values are considered more prestigious or important within their field. The Impact Factor of a journa ... of 2.488, ranking it 7th out of 48 journals in the category "Paleontology", though its IF has since declined. References External links * Paleontology journals Wiley-Blackwell academic journals English-language journals Academic journals established in 1968 Quarterly journals {{paleontology-journal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Robert Savage (palaeontologist)
Robert Savage or variants may refer to: *Robert Savage (executive) (1934–2023), president and chief executive of American Express *Robert Savage (MP), Member of Parliament (MP) for City of York *Robbie Savage (born 1974), Welsh international football player and pundit *Robbie Savage (footballer, born 1960), English football player *Robbie Savage (football fan) (1967–2017), former mascot of the Namibian national football team *Robert Savage (Australian politician) (1895–1959), member of the New South Wales Legislative Council *Ted Savage (footballer) (1912–?), full name Robert Edward Savage, English footballer who played for Liverpool F.C. *Robert Savage (cricketer) (born 1960), former English cricketer *R. J. G. Savage (1927–1998), British palaeontologist *Bob Savage (1921–2013), American baseball player *Robert Savage (racing driver) Robert Savage is a racing driver from County Meath, Ireland Ireland (, ; ; Ulster Scots dialect, Ulster-Scots: ) is an islan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Libya
Libya, officially the State of Libya, is a country in the Maghreb region of North Africa. It borders the Mediterranean Sea to the north, Egypt to Egypt–Libya border, the east, Sudan to Libya–Sudan border, the southeast, Chad to Chad–Libya border, the south, Niger to Libya–Niger border, the southwest, Algeria to Algeria–Libya border, the west, and Tunisia to Libya–Tunisia border, the northwest. With an area of almost , it is the 4th-largest country in Africa and the Arab world, and the List of countries and outlying territories by total area, 16th-largest in the world. Libya claims 32,000 square kilometres of southeastern Algeria, south of the Libyan town of Ghat, Libya, Ghat. The largest city and capital is Tripoli, Libya, Tripoli, which is located in northwestern Libya and contains over a million of Libya's seven million people. Libya has been inhabited by Berber people, Berbers since the late Bronze Age as descendants from Iberomaurusian and Capsian cultures. I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Uganda
Uganda, officially the Republic of Uganda, is a landlocked country in East Africa. It is bordered to the east by Kenya, to the north by South Sudan, to the west by the Democratic Republic of the Congo, to the south-west by Rwanda, and to the south by Tanzania. The southern part includes a substantial portion of Lake Victoria, shared with Kenya and Tanzania. Uganda is in the African Great Lakes region, lies within the Nile basin, and has a varied equatorial climate. , it has a population of 49.3 million, of whom 8.5 million live in the capital and largest city, Kampala. Uganda is named after the Buganda, Buganda kingdom, which encompasses a large portion of the south, including Kampala, and whose language Luganda is widely spoken; the official language is English. The region was populated by various ethnic groups, before Bantu and Nilotic groups arrived around 3,000 years ago. These groups established influential kingdoms such as the Empire of Kitara. The arrival of Arab trade ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
