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Erpetonyx
''Erpetonyx'' is an extinct genus of bolosaurian parareptile from the Gzhelian stage of the Carboniferous period, with a single known species: ''Erpetonyx arsenaultorum''. It is known from a single articulated and mostly complete specimen from Prince Edward Island in Canada. Phylogenetics has predicted that parareptiles first evolved in the Carboniferous, parallel to eureptiles ("true reptiles"). However, ''Hylonomus'', the oldest eureptile known from fossil evidence, lived millions of years before parareptiles appeared in the fossil record. The discovery of ''Erpetonyx'' helped to shorten this gap between parareptile and eureptile fossils, as ''Erpetonyx'' lived in the Late Carboniferous and is one of the oldest known parareptiles (though ''Carbonodraco'' is now known to be older). However, it was not closely related to ancestral parareptiles, so its discovery also indicated that the initial diversification of parareptiles occurred earlier in the Carboniferous. ''Erpetonyx'' was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carbonodraco
''Carbonodraco'' is an extinct genus of acleistorhinid parareptile known from the Late Carboniferous of Ohio. It contains a single species, ''Carbonodraco lundi''. It was closely related to ''Colobomycter'', a parareptile from the early Permian of Oklahoma. ''Carbonodraco'' is the oldest known parareptile, and is slightly older than ''Erpetonyx'', the previously oldest known parareptile. Specimens of ''Carbonodraco'' are limited to skull and jaw fragments found at the Ohio Diamond Coal mine in Linton, Ohio. These include the holotype specimen (CM 23055, a crushed skull) and two referred specimens (NHMUK R. 2667, a right jaw; CM 81536, a pair of dentaries). Several of the ''Carbonodraco'' specimens were previously referred to the Carboniferous eureptile ''Cephalerpeton ''Cephalerpeton'' is an extinct genus of " protorothyridid" eureptile known from the Late Carboniferous (late Westphalian stage) of Illinois. It is known from the holotype YPM 796, a partial skeleton. It w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parareptile
Parareptilia ("at the side of reptiles") is a subclass or clade of basal sauropsids (reptiles), typically considered the sister taxon to Eureptilia (the group that likely contains all living reptiles and birds). Parareptiles first arose near the end of the Carboniferous period and achieved their highest diversity during the Permian period. Several ecological innovations were first accomplished by parareptiles among reptiles. These include the first reptiles to return to marine ecosystems (mesosaurs), the first bipedal reptiles ( bolosaurids such as ''Eudibamus''), the first reptiles with advanced hearing systems ( nycteroleterids and others), and the first large herbivorous reptiles (the pareiasaurs). The only parareptiles to survive into the Triassic period were the procolophonoids, a group of small generalists, omnivores, and herbivores. The largest family of procolophonoids, the procolophonids, rediversified in the Triassic, but subsequently declined and became extinct by the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gzhelian
The Gzhelian ( ) is an age in the ICS geologic timescale or a stage in the stratigraphic column. It is the youngest stage of the Pennsylvanian, the youngest subsystem of the Carboniferous. The Gzhelian lasted from to Ma. It follows the Kasimovian age/stage and is followed by the Asselian age/stage, the oldest subdivision of the Permian system. The Gzhelian is more or less coeval with the Stephanian Stage of the regional stratigraphy of Europe. Name and definition The Gzhelian is named after the Russian village of Gzhel (russian: Гжель), nearby Ramenskoye, not far from Moscow. The name and type locality were defined by Sergei Nikitin (1850–1909) in 1890. The base of the Gzhelian is at the first appearance of the Fusulinida genera '' Daixina'', '' Jigulites'' and '' Rugosofusulina'', or at the first appearance of the conodont ''Streptognathodus zethus''. The top of the stage (the base of the Permian system) is at the first appearance of the conodont ''Streptognath ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cape Breton University
, "Diligence Will Prevail" , mottoeng = Perseverance Will Triumph , established = 1951 as Xavier Junior College 1968 as NSEIT 1974 as College Of Cape Breton 1982 as University College of Cape Breton 2005 as Cape Breton University , former_names = Xavier Junior College (1951)Nova Scotia Eastern Institute of Technology (1968)College of Cape Breton (1974)University College of Cape Breton (1982) , type = Public , students = 4,478 (2021) , undergrad = 4,067 , postgrad = 411 , administrative_staff = 225 (as of March 2019) , faculty = 227 (as of March 2019) , endowment = $27.8M , president = David Dingwall , principal = , rector = , chancellor = Annette Verschuren , vice_chancellor = , dean = , head_label = , head = , doctoral = , addre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Supratemporal Bone
The supratemporal bone is a paired cranial bone present in many tetrapods and tetrapodomorph fish. It is part of the temporal region (the portion of the skull roof behind the eyes), usually lying medial (inwards) relative to the squamosal and lateral (outwards) relative to the parietal and/or postparietal. It may also contact the postorbital or intertemporal (which lie forwards), or tabular (which lies backwards), when those bones are present. The supratemporal is a common component of the skull in many extinct amphibians, though it is apparently absent in the lightweight skulls of living lissamphibians (frogs and salamanders). Embryological studies of salamanders suggests that the supratemporal fuses with the squamosal in early development. A separate supratemporal was retained by early synapsids and reptiles, but was strongly reduced in many groups. Squamates (lizards and snakes) still possess a small supratemporal, though archosaurs (crocodilians and birds) and mammals lack i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Labyrinthodontia
"Labyrinthodontia" (Greek, 'maze-toothed') is an informal grouping of extinct predatory amphibians which were major components of ecosystems in the late Paleozoic and early Mesozoic eras (about 390 to 150 million years ago). Traditionally considered a subclass of the class Amphibia, modern classification systems recognize that labyrinthodonts are not a formal natural group (clade) exclusive of other tetrapods. Instead, they consistute an evolutionary grade (a paraphyletic group), ancestral to living tetrapods such as lissamphibians (modern amphibians) and amniotes (reptiles, mammals, and kin). "Labyrinthodont"-grade vertebrates evolved from lobe-finned fishes in the Devonian, though a formal boundary between fish and amphibian is difficult to define at this point in time. "Labyrinthodont" generally refers to extinct four-limbed tetrapods with a large body size and a crocodile-like lifestyle. The name describes the pattern of infolding of the dentin and enamel of the teeth, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dentin
Dentin () (American English) or dentine ( or ) (British English) ( la, substantia eburnea) is a calcified tissue of the body and, along with enamel, cementum, and pulp, is one of the four major components of teeth. It is usually covered by enamel on the crown and cementum on the root and surrounds the entire pulp. By volume, 45% of dentin consists of the mineral hydroxyapatite, 33% is organic material, and 22% is water. Yellow in appearance, it greatly affects the color of a tooth due to the translucency of enamel. Dentin, which is less mineralized and less brittle than enamel, is necessary for the support of enamel. Dentin rates approximately 3 on the Mohs scale of mineral hardness. There are two main characteristics which distinguish dentin from enamel: firstly, dentin forms throughout life; secondly, dentin is sensitive and can become hypersensitive to changes in temperature due to the sensory function of odontoblasts, especially when enamel recedes and dentin channels becom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bolosauridae
Bolosauridae is an extinct family of ankyramorph parareptiles known from the latest Carboniferous (Gzhelian) or earliest Permian (Asselian) to the early Guadalupian epoch (latest Roadian stage) of North America, China, Germany, Russia and France. The bolosaurids were unusual for their time period by being bipedal, the oldest known tetrapods to have been so. Their teeth suggest that they were herbivores. The bolosaurids were a rare group and died out without any known descendants. The following cladogram shows the phylogenetic In biology, phylogenetics (; from Greek φυλή/ φῦλον [] "tribe, clan, race", and wikt:γενετικός, γενετικός [] "origin, source, birth") is the study of the evolutionary history and relationships among or within groups o ... position of the Bolosauridae, from Johannes Müller, Jin-Ling Li and Robert R. Reisz, 2008. References Procolophonomorphs Permian reptiles Paleozoic reptiles of Asia Paleozoic reptiles of Europe Pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neues Jahrbuch Für Geologie Und Paläontologie
''Neues Jahrbuch für Geologie und Paläontologie'' is a peer-reviewed scientific journal covering research in geology and paleontology. The journal is published monthly, with 4 volumes per year. Abstracting and indexing The journal is abstracted and indexed in Science Citation Index Expanded and Current Contents. According to the ''Journal Citation Reports'', the journal has a 2019 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as i ... of 0.981. References External links * Geology journals Publications established in 1807 English-language journals E. Schweizerbart academic journals Quarterly journals Paleontology journals {{paleontology-journal-stub es:Journal of Molluscan Studies ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oskar Kuhn
Oskar Kuhn (7 March 1908, Munich – 1990) was a German palaeontologist. Life and career Kuhn was educated in Dinkelsbühl and Bamberg and then studied natural science, specialising in geology and paleontology, at the University of Munich, from which he received his D. Phil. in 1932. He worked in the University of Munich Geological Institute, among other things on the ''Fossilium Catalogus'' (Catalogue of Fossils), and then in 1938 on a stipend from the Deutsche Forschungsgemeinschaft, moved to the University of Halle, where he worked on the Geiseltal fossils. In 1939 he achieved his Habilitation with a thesis on the Halberstadt Keuper fauna, and in 1940 was named Privatdozent in geology and paleontology. Informed by his Catholic religion, Kuhn was an exponent of idealistic morphology: he viewed evolution as operating only within predetermined morphological classes. In 1943 he declared, "The theory of descent has collapsed." After a political conflict with his mentor, Johan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Everett C
Everett may refer to: Places Canada * Everett, Ontario, a community in Adjala–Tosorontio, Simcoe County * Everett Mountains, a range on southern Baffin Island in Nunavut United States * Everett, Massachusetts, in Middlesex County, Massachusetts north of Boston * Everett, Missouri, an unincorporated community * Everett, Nebraska, an unincorporated community * Everett, New Jersey, an unincorporated community * Everett, Ohio, an unincorporated community * Everett, Pennsylvania, in Bedford County, Pennsylvania ** Everett Area School District, a public school district in Bedford Country. * Everett, Washington, the county seat and largest city in Washington state's Snohomish County ** Everett Massacre, an armed confrontation between local authorities and members of the Industrial Workers of the World union ** Boeing Everett Factory, an airplane assembly building owned by Boeing * Everett Township (other), a list of townships named Everett Elsewhere * Everett Range, Ant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
