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Somniosus
''Somniosus'' is a widely distributed genus of deepwater dogfish sharks in the family Somniosidae. Several members of the genus are believed to attain lengths up to , thus ranking among the largest of sharks. Species * '' Somniosus antarcticus'' Whitley, 1939 (southern sleeper shark) * †'' Somniosus gonzalezi'' Welton & Goedert, 2016 – fossil, Oligocene * '' Somniosus longus'' Tanaka, 1912 (frog shark) * ''Somniosus microcephalus'' ( Bloch & J. G. Schneider, 1801) (Greenland shark) * '' Somniosus pacificus'' Bigelow & Schroeder, 1944 (Pacific sleeper shark) * '' Somniosus rostratus'' A. Risso, 1827 (little sleeper shark) * ''Somniosus'' sp. A Not yet described (longnose sleeper shark) Image:Somniosus microcephalus okeanos.jpg , ''Somniosus microcephalus'' Image:Somniosus pacificus noaa2.jpg, '' Somniosus pacificus'' Image:Somniosus rostratus adult JGF.jpg, '' Somniosus rostratus'' Image:Somniosus antarcticus.jpg, '' Somniosus antarcticus'' See also * List of prehist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Somniosus Microcephalus
The Greenland shark (''Somniosus microcephalus''), also known as the gurry shark, grey shark, or by the Kalaallisut name ''eqalussuaq'', is a large shark of the family Somniosidae ("sleeper sharks"), closely related to the Pacific and southern sleeper sharks. The distribution of this species is mostly restricted to the waters of the North Atlantic Ocean and Arctic Ocean; however, more recent evidence indicates that at great depths it may range as far south as the Caribbean. The Greenland shark has the longest known lifespan of all vertebrate species (estimated to be between 250 and 500 years), and is among the largest extant species of shark. It is a generalist feeder, consuming a variety of available foods. As an adaptation to living at depth, it has a high concentration of trimethylamine ''N''-oxide in its tissues, which causes the meat to be toxic. Greenland shark flesh, treated to reduce toxin levels, is eaten in Iceland as a delicacy known as '' kæstur hákarl''. As it li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Somniosus
''Somniosus'' is a widely distributed genus of deepwater dogfish sharks in the family Somniosidae. Several members of the genus are believed to attain lengths up to , thus ranking among the largest of sharks. Species * '' Somniosus antarcticus'' Whitley, 1939 (southern sleeper shark) * †'' Somniosus gonzalezi'' Welton & Goedert, 2016 – fossil, Oligocene * '' Somniosus longus'' Tanaka, 1912 (frog shark) * ''Somniosus microcephalus'' ( Bloch & J. G. Schneider, 1801) (Greenland shark) * '' Somniosus pacificus'' Bigelow & Schroeder, 1944 (Pacific sleeper shark) * '' Somniosus rostratus'' A. Risso, 1827 (little sleeper shark) * ''Somniosus'' sp. A Not yet described (longnose sleeper shark) Image:Somniosus microcephalus okeanos.jpg , ''Somniosus microcephalus'' Image:Somniosus pacificus noaa2.jpg, '' Somniosus pacificus'' Image:Somniosus rostratus adult JGF.jpg, '' Somniosus rostratus'' Image:Somniosus antarcticus.jpg, '' Somniosus antarcticus'' See also * List of prehist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Somniosus Antarcticus
The southern sleeper shark or Whitley's sleeper shark (''Somniosus antarcticus'') is a deepwater benthopelagic sleeper shark of the family Somniosidae found in the southern Atlantic, Indian, and Pacific Oceans. Taxonomy It was formerly sometimes viewed as conspecific with either the Greenland shark (''Somniosus microcephalus''), or the Pacific sleeper shark (''Somniosus pacificus''). Habitat It is known from depths of 400 to 1,100 m. Description Its length is up to . The southern sleeper shark differs from ''S. microcephalus'' in having more tooth rows in the lower jaw, a shorter interdorsal region, a more posterior first dorsal fin, and fewer precaudal vertebrae, and from both species in having lower dorsal fins. Diet It feeds primarily on cephalopods, especially squid- including the Giant and colossal squids- and fish; its stomach contents also less commonly contain remains of marine mammals and birds. Based on its generally sluggish nature and the speed of its prey, it i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Somniosus Pacificus
The Pacific sleeper shark (''Somniosus pacificus'') is a sleeper shark of the family Somniosidae, found in the North Pacific on continental shelves and slopes in Arctic and temperate waters between latitudes 70°N and 22°N, from the surface to deep. Records from southern oceans are likely misidentifications of relatives. Its length is up to , although it could possibly reach lengths in excess of . Feeding habits Pacific sleeper sharks, which are thought to be both predators and scavengers, can glide through the water with little body movement and little hydrodynamic noise, making them successful stealth predators. They feed by means of suction and cutting of their prey. They have large mouths that can essentially inhale prey and their teeth cut up any pieces that are too large to swallow. They show a characteristic rolling motion of the head when feeding. Only in Alaska has the shark's diet been studied - most sharks' stomachs contain remains of giant Pacific octopus. They ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Somniosidae
The Somniosidae are a family of sharks in the order Squaliformes, commonly known as sleeper sharks. The common name ''"sleeper shark"'' comes from their slow swimming, low activity level, and perceived non-aggressive nature. Distribution and habitat The Somniosidae can be found in: *Arctic to subantarctic waters *Shelves in cold waters *Continental and slopes *Temperate and tropical waters Diet Beaks recovered from the stomachs of sleeper sharks suggest they feed on colossal squid.Cherel, Y. & G. Duhamel 2004. ''Deep-Sea Research Part I'' 51: 17–31. Genera and species * ''Centroscymnus'' Barbosa du Bocage & Brito Capello, 1864 ** '' Centroscymnus coelolepis'' Barbosa du Bocage & Brito Capello, 1864 (Portuguese dogfish) ** ''Centroscymnus owstonii'' Garman, 1906 (roughskin dogfish) * '' Centroselachus'' Garman, 1913 ** '' Centroselachus crepidater'' Barbosa du Bocage & Brito Capello, 1864 (longnose velvet dogfish) * ''Scymnodalatias'' Garrick, 1956 ** ''Scymnodalatias ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Somniosus Longus
The frog shark (''Somniosus longus'') is a very rare species of squaliform shark mainly found in deep water in the Pacific Ocean. It is in the sleeper shark family Somniosidae with the Greenland shark. Description The frog shark is known to grow to a maximum length of 110 cm in males and 130 cm in females. Previously classified in the same taxon as the similar '' Somniosus rostratus'', it is differentiated from ''S. rostratus'' in having a longer second dorsal fin, a slightly larger eye, more rows of teeth and a greater spiral valve count. Range Fewer than a dozen specimens of this deepwater shark have been collected, mostly from the Pacific Ocean. The frog shark has been recorded off the coasts of Japan, New Zealand, and possibly Salas y Gómez, as well as the Nazca Ridge, from as shallow as 120–150 m and as deep as 1,116 m. Threats The frog shark is occasionally caught by trawl, longline, and crab-pot fisheries. As of 2015, no current conservation efforts are in pl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Somniosus Rostratus
The little sleeper shark (''Somniosus rostratus'') is a small sleeper shark of the family Somniosidae found in the northeast Atlantic, western Mediterranean, and western Pacific around New Zealand New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and over 700 smaller islands. It is the sixth-largest island count ..., at depths between 200 and 1,000 m. Its length is up to 1.43 m. Distribution This species is rarely encountered. It has in the northeast Atlantic and western Mediterranean. It has also been found in Israel and Cuba. Habitat Although currently the species has been found in water at depths of 180-2200m, it is possible that it may range deeper. It is a bathydemersal species found above sandy mud substrate on the outer continental shelves and on the upper slopes. Ecology Reproduction and Growth ''S. rostratus'' reaches a maximu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Somniosus Gonzalezi
''Somniosus gonzalezi'' is an extinct species of sleeper shark that lived during the Oligocene epoch Rupelian to Chattian stages. The species was described from teeth fossils found in the Pysht Formation of Washington states Olympic Peninsula The Olympic Peninsula is a large arm of land in western Washington that lies across Puget Sound from Seattle, and contains Olympic National Park. It is bounded on the west by the Pacific Ocean, the north by the Strait of Juan de Fuca, and the .... References Fossil taxa described in 2016 Somniosus gonzalezi Prehistoric sharks Fossils of the United States Fish described in 2016 {{Shark-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Prehistoric Cartilaginous Fish
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 assigne ... [...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] |
Squaliformes
The Squaliformes are an order (biology), order of sharks that includes about 126 species in seven families. Members of the order have two dorsal fins, which usually possess spines, they usually have a sharp head, no anal fin or nictitating membrane, and five to seven gill slits. In most other respects, however, they are quite variable in form and size. Most species of the squaliform order live in saltwater or brackish water. They are found worldwide, from northern to tropical waters, and from shallow coastal seas to the open ocean. All members of the family Eptomeridae and Dalatiidae and ''Zameus squamulosus'' possess photophores, luminous organs, and exhibit intrinsic bioluminescence. Bioluminescence evolved once in Squaliformes, approximately 111–153 million years ago, and helped the Squaliformes radiate and adapt to the deep sea. The common ancestor of Dalatiidae, Etmopteridae, Somniosidae, and Oxynotidae possessed a luminous organ and used bioluminescence for camouf ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extant Oligocene First Appearances
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Extant is the opposite of the word extinct. It may refer to: * Extant hereditary titles * Extant literature, surviving literature, such as ''Beowulf'', the oldest extant manuscript written in English * Extant taxon, a taxon which is not extinct, such as an extant species * Extant Theatre Company, a disability arts organisation * ''Extant'' (TV series), an American television series * Hank Hall, also known as Extant, a DC Comics supervillain See also * Extent (other) Extent may refer to: Computing * Extent (file systems), a contiguous region of computer storage medium reserved for a file * Extent File System, a discontinued file system implementation named after the contiguous region * Extent, a chunk of s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
