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Heptranchias
''Heptranchias'' is a genus of sharks in the family Cow shark, Hexanchidae. Species *''Sharpnose sevengill shark, Heptranchias perlo'' (Pierre Joseph Bonnaterre, Bonnaterre, 1788) (sharpnose sevengill shark) *†''Heptranchias ezoensis'' Applegate & Uyeno, 1968 *†''Heptranchias howelli'' Reed, 1946 *†''Heptranchias karagalensis'' Kozlov in Zhelezko & Kozlov, 1999 *†''Heptranchias tenuidens'' Leriche, 1938 Fossil record Fossils of ''Heptranchias'' are found in marine strata from the Cretaceous period. Fossils are known from various localities in Europe, North America, South America, New Zealand and Japan. Bibliography *Bonnaterre, J.P. 1788, Tableau encyclopédique et méthodique des trois règnes de la nature... Ichthyologie. Paris. Tableau encyclopédique et méthodique des trois règnes de la nature... Ichthyologie.: i-lvi + 1-215, Pls. A-B + 1-100. *Compagno, L.J.V. 1. Hexanchiformes to Lamniformes // Sharks of the world. An annotated and illustrated catalogue of s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sharpnose Sevengill Shark
The sharpnose sevengill shark (''Heptranchias perlo''), also known as one-finned shark, perlon shark, sevengill cow shark, sharpsnouted sevengill or slender sevengill, is a species of shark in the family Hexanchidae, and the only living species in the genus ''Heptranchias''. Found almost circumglobally in deep water, it is one of the few species of sharks with seven pairs of gill slits as opposed to the usual five. The other shark species with seven gill slits is the broadnose sevengill shark. Though small, this shark is an active, voracious predator of invertebrates and fish. When caught, this species is notably defensive and will attempt to bite. It is of minor commercial importance. Taxonomy The genus name ''Heptranchias'' is from the Greek ''heptra'' meaning "seven arms", and ''agchein'' meaning "throttle", referring to this shark's seven pairs of gill slits. Other common names for this species include one-finned shark, perlon shark, sevengill cow shark, sevengilled Mediterr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heptranchias Perlo Lower Teeth
''Heptranchias'' is a genus of sharks in the family Hexanchidae. Species *''Heptranchias perlo'' ( Bonnaterre, 1788) (sharpnose sevengill shark) *†''Heptranchias ezoensis'' Applegate & Uyeno, 1968 *†''Heptranchias howelli'' Reed, 1946 *†''Heptranchias karagalensis'' Kozlov in Zhelezko & Kozlov, 1999 *†''Heptranchias tenuidens'' Leriche, 1938 Fossil record Fossils of ''Heptranchias'' are found in marine strata from the Cretaceous period. Fossils are known from various localities in Europe, North America, South America, New Zealand and Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north .... Bibliography *Bonnaterre, J.P. 1788, Tableau encyclopédique et méthodique des trois règnes de la nature... Ichthyologie. Paris. Tableau encyclopédique et méthodique des troi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heptranchias
''Heptranchias'' is a genus of sharks in the family Cow shark, Hexanchidae. Species *''Sharpnose sevengill shark, Heptranchias perlo'' (Pierre Joseph Bonnaterre, Bonnaterre, 1788) (sharpnose sevengill shark) *†''Heptranchias ezoensis'' Applegate & Uyeno, 1968 *†''Heptranchias howelli'' Reed, 1946 *†''Heptranchias karagalensis'' Kozlov in Zhelezko & Kozlov, 1999 *†''Heptranchias tenuidens'' Leriche, 1938 Fossil record Fossils of ''Heptranchias'' are found in marine strata from the Cretaceous period. Fossils are known from various localities in Europe, North America, South America, New Zealand and Japan. Bibliography *Bonnaterre, J.P. 1788, Tableau encyclopédique et méthodique des trois règnes de la nature... Ichthyologie. Paris. Tableau encyclopédique et méthodique des trois règnes de la nature... Ichthyologie.: i-lvi + 1-215, Pls. A-B + 1-100. *Compagno, L.J.V. 1. Hexanchiformes to Lamniformes // Sharks of the world. An annotated and illustrated catalogue of s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heptranchias Ezoensis
''Heptranchias'' is a genus of sharks in the family Hexanchidae. Species *'' Heptranchias perlo'' ( Bonnaterre, 1788) (sharpnose sevengill shark) *†'' Heptranchias ezoensis'' Applegate & Uyeno, 1968 *†''Heptranchias howelli'' Reed, 1946 *†''Heptranchias karagalensis'' Kozlov in Zhelezko & Kozlov, 1999 *†''Heptranchias tenuidens'' Leriche, 1938 Fossil record Fossils of ''Heptranchias'' are found in marine strata from the Cretaceous period. Fossils are known from various localities in Europe, North America, South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the sout ..., New Zealand and Japan. Bibliography *Bonnaterre, J.P. 1788, Tableau encyclopédique et méthodique des trois règnes de la nature... Ichthyologie. Paris. Tableau encyclopédique et méthodique des ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heptranchias Karagalensis
''Heptranchias'' is a genus of sharks in the family Hexanchidae. Species *'' Heptranchias perlo'' ( Bonnaterre, 1788) (sharpnose sevengill shark) *†'' Heptranchias ezoensis'' Applegate & Uyeno, 1968 *†'' Heptranchias howelli'' Reed, 1946 *†'' Heptranchias karagalensis'' Kozlov in Zhelezko & Kozlov, 1999 *†''Heptranchias tenuidens'' Leriche, 1938 Fossil record Fossils of ''Heptranchias'' are found in marine strata from the Cretaceous period. Fossils are known from various localities in Europe, North America, South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the sout ..., New Zealand and Japan. Bibliography *Bonnaterre, J.P. 1788, Tableau encyclopédique et méthodique des trois règnes de la nature... Ichthyologie. Paris. Tableau encyclopédique et méthodique de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heptranchias Tenuidens
''Heptranchias'' is a genus of sharks in the family Hexanchidae. Species *'' Heptranchias perlo'' ( Bonnaterre, 1788) (sharpnose sevengill shark) *†'' Heptranchias ezoensis'' Applegate & Uyeno, 1968 *†'' Heptranchias howelli'' Reed, 1946 *†'' Heptranchias karagalensis'' Kozlov in Zhelezko & Kozlov, 1999 *†'' Heptranchias tenuidens'' Leriche, 1938 Fossil record Fossils of ''Heptranchias'' are found in marine strata from the Cretaceous period. Fossils are known from various localities in Europe, North America, South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the sout ..., New Zealand and Japan. Bibliography *Bonnaterre, J.P. 1788, Tableau encyclopédique et méthodique des trois règnes de la nature... Ichthyologie. Paris. Tableau encyclopédique et méthodique d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heptranchias Howelli
''Heptranchias howelli'', the sevengill shark, is a nektonic carnivore in the genus ''Heptranchias''. It is an extinct species that ranged from 37.2 to 20.43 Ma.''Heptranchias howelli'' at Fossilworks.org Fossil record Teeth from ''Heptranchias howelli'' have been found in Europe. An antero-lateral tooth and an upper lateral tooth were found in , |
List Of Prehistoric Cartilaginous Fish Genera
This list of prehistoric cartilaginous fish genera is an attempt to create a comprehensive listing of all genera that have ever been included in the class chondrichthyes ''and'' are known from the fossil record. This list excludes purely vernacular terms, genera that are now considered invalid, doubtful (nomina dubia), or were not formally published (nomina nuda), as well as junior synonyms of more established names, and genera that are no longer considered to be cartilaginous fish. It includes all commonly accepted genera. This list currently contains 804 generic names. * Extinct genera are marked by a dagger ( †). * Extant taxon genera are bolded. Naming conventions and terminology Naming conventions and terminology follow the International Code of Zoological Nomenclature. Technical terms used include: * Junior synonym: A name which describes the same taxon as a previously published name. If two or more genera are formally designated and the type specimens are later ass ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cow Shark
Cow sharks are a shark family, the Hexanchidae, characterized by an additional pair or pairs of gill slits. Its 37 species are placed within the 10 genera: ''Gladioserratus'', ''Heptranchias'', ''Hexanchus'', ''Notidanodon'', ''Notorynchus'', ''Pachyhexanchus'', ''Paraheptranchias'', ''Pseudonotidanus'', ''Welcommia'', and ''Weltonia''.Compagno, L., Dando, M. and Fowler, S. ''Sharks of the World''. Princeton Field Guides Cow sharks are considered the most primitive of all the sharks, as their skeletons resemble those of ancient extinct forms, with few modern adaptations. Their excretory and digestive systems are also unspecialized, suggesting they may resemble those of primitive shark ancestors. A possible hexanchid tooth is known from the Permian of Japan, making the family a possible extant survivor of the Permian-Triassic extinction. Their most distinctive feature, however, is the presence of a sixth, and, in two genera, a seventh, gill slit, in contrast to the five found in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cretaceous
The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of the entire Phanerozoic. The name is derived from the Latin ''creta'', "chalk", which is abundant in the latter half of the period. It is usually abbreviated K, for its German translation ''Kreide''. The Cretaceous was a period with a relatively warm climate, resulting in high eustatic sea levels that created numerous shallow inland seas. These oceans and seas were populated with now- extinct marine reptiles, ammonites, and rudists, while dinosaurs continued to dominate on land. The world was ice free, and forests extended to the poles. During this time, new groups of mammals and birds appeared. During the Early Cretaceous, flowering plants appeared and began to rapidly diversify, becoming the dominant group of plants across the Earth b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taxa Named By Constantine Samuel Rafinesque
In biology, a taxon (back-formation from ''taxonomy''; plural taxa) is a group of one or more populations of an organism or organisms seen by taxonomists to form a unit. Although neither is required, a taxon is usually known by a particular name and given a particular ranking, especially if and when it is accepted or becomes established. It is very common, however, for taxonomists to remain at odds over what belongs to a taxon and the criteria used for inclusion. If a taxon is given a formal scientific name, its use is then governed by one of the nomenclature codes specifying which scientific name is correct for a particular grouping. Initial attempts at classifying and ordering organisms (plants and animals) were set forth in Carl Linnaeus's system in ''Systema Naturae'', 10th edition (1758), as well as an unpublished work by Bernard and Antoine Laurent de Jussieu. The idea of a unit-based system of biological classification was first made widely available in 1805 in the intro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shark Genera
Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the rays. However, the term "shark" has also been used to refer to all extinct members of Chondrichthyes with a shark-like morphology, such as hybodonts and xenacanths. The oldest modern sharks are known from the Early Jurassic. They range in size from the small dwarf lanternshark (''Etmopterus perryi''), a deep sea species that is only in length, to the whale shark (''Rhincodon typus''), the largest fish in the world, which reaches approximately in length. Sharks are found in all seas and are common to depths up to . They generally do not live in freshwater, although there are a few known exceptions, such as the bull shark and the river shark, which can be found in both seawater and freshwat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
