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Somniosus
''Somniosus'' is a widely distributed genus of deepwater Squaliformes, dogfish sharks in the family (biology), family Somniosidae. Several members of the genus are believed to attain lengths up to , thus ranking among the largest of sharks. Species * ''Somniosus antarcticus'' Gilbert Percy Whitley, Whitley, 1939 (southern sleeper shark) * ''Taiwan sleeper shark, Somniosus cheni'' Hsu, Lin, & Joung, 2020 (Taiwan sleeper shark) * †''Somniosus gonzalezi'' Welton & Goedert, 2016 – fossil, Oligocene * ''Somniosus longus'' Shigeho Tanaka, Tanaka, 1912 (frog shark) * ''Somniosus microcephalus'' (Marcus Elieser Bloch, Bloch & Johann Gottlob Schneider, J. G. Schneider, 1801) (Greenland shark) * ''Somniosus pacificus'' Henry Bryant Bigelow, Bigelow & William Charles Schroeder, Schroeder, 1944 (Pacific sleeper shark) * ''Somniosus rostratus'' Antoine Risso, A. Risso, 1827 (little sleeper shark) * ''Somniosus'' sp. A Not yet described (longnose sleeper shark) Image:Somniosus microcephal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Somniosus Microcephalus
The Greenland shark (''Somniosus microcephalus''), also known as the gurry shark or grey shark, is a large shark of the family Somniosidae ("sleeper sharks"), closely related to the Pacific sleeper shark, Pacific and southern sleeper sharks. Inhabiting the North Atlantic and Arctic Oceans, they are notable for their exceptional longevity, although they are poorly studied due to the depth and remoteness of their natural habitat. Greenland sharks have the longest lifespan of any known vertebrate, estimated to be between 250 and 500 years. They are among the largest extant shark species, reaching a maximum confirmed length of long and weighing over . They reach sexual maturity at about 150 years of age, and their pups are born alive after an estimated gestation period of 8 to 18 years. The shark is a Generalist and specialist species, generalist feeder, consuming a variety of available foods, including carrion. Greenland shark meat is Toxicity, toxic to mammals due to its high lev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Somniosus
''Somniosus'' is a widely distributed genus of deepwater Squaliformes, dogfish sharks in the family (biology), family Somniosidae. Several members of the genus are believed to attain lengths up to , thus ranking among the largest of sharks. Species * ''Somniosus antarcticus'' Gilbert Percy Whitley, Whitley, 1939 (southern sleeper shark) * ''Taiwan sleeper shark, Somniosus cheni'' Hsu, Lin, & Joung, 2020 (Taiwan sleeper shark) * †''Somniosus gonzalezi'' Welton & Goedert, 2016 – fossil, Oligocene * ''Somniosus longus'' Shigeho Tanaka, Tanaka, 1912 (frog shark) * ''Somniosus microcephalus'' (Marcus Elieser Bloch, Bloch & Johann Gottlob Schneider, J. G. Schneider, 1801) (Greenland shark) * ''Somniosus pacificus'' Henry Bryant Bigelow, Bigelow & William Charles Schroeder, Schroeder, 1944 (Pacific sleeper shark) * ''Somniosus rostratus'' Antoine Risso, A. Risso, 1827 (little sleeper shark) * ''Somniosus'' sp. A Not yet described (longnose sleeper shark) Image:Somniosus microcephal ... [...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 and subantarctic extremes of the Atlantic, Indian and Pacific Oceans, and some northern reaches of the Antarctic oceans. It has been recorded near the southernmost areas of South America (such as Tierra del Fuego and the Strait of Magellan), near South Africa, southern Australia, Tasmania and New Zealand, as well as more remote locations in the south-central Indian Ocean. Taxonomy It was formerly sometimes viewed as conspecific with either the Greenland shark (''Somniosus microcephalus''), or the Pacific sleeper shark (''Somniosus pacificus''). Habitat A deepwater species, the southern sleeper shark is known to frequent waters around 400m (1312 feet) to as deep as 1100m (3608 feet). Description The southern sleeper shark's body length measures up to . This species differs from the Greenland shark (''S. mi ... [...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 ** '' Scymnodala ... [...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, along with the Greenland shark. Description The frog shark is known to grow to a maximum length of in males and 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 place. In J ... [...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 (though these records may be of another species), 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 maximum size of 140 cm. Males mature at 71 cm. Females mature at 80 cm and are aplacental viviparous, giving birth to 8–17 pups per litter. Much about the reproduction of this species is still ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taiwan Sleeper Shark
The Taiwan sleeper shark (''Somniosus cheni'') is a small sleeper shark from the western North Pacific Ocean around Taiwan Taiwan, officially the Republic of China (ROC), is a country in East Asia. The main geography of Taiwan, island of Taiwan, also known as ''Formosa'', lies between the East China Sea, East and South China Seas in the northwestern Pacific Ocea .... It is only known from a single adult specimen, a pregnant female with 33 embryos, which was caught in 2017. References {{Taxonbar, from=Q108470791 Fish described in 2020 Somniosus Species known from a single specimen ... [...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 peninsula 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 Oligocene sharks Fossils of the United States Fish described in 2016 {{paleo-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 Genus, 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. * Extinction, 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: * Synonym (zoology), Junior synonym: A name which describes the same taxon as a previously published name. If two or more genera are formally designated and t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shark Genera
Sharks are a group of elasmobranch cartilaginous fish characterized by a ribless endoskeleton, dermal denticles, five to seven gill slits on each side, and pectoral fins that are not fused to the head. Modern sharks are classified within the division Selachii and are the sister group to the Batomorphi ( rays and skates). Some sources extend the term "shark" as an informal category including extinct members of Chondrichthyes (cartilaginous fish) with a shark-like morphology, such as hybodonts. Shark-like chondrichthyans such as ''Cladoselache'' and ''Doliodus'' first appeared in the Devonian Period (419–359 million years), though some fossilized chondrichthyan-like scales are as old as the Ordovician, Late Ordovician (458–444 million years ago). The earliest confirmed modern sharks (Selachii) are known from the Early Jurassic around , with the oldest known member being ''Agaleus'', though records of true sharks may extend back as far as the Permian. Sharks range in size ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Squaliformes
The Squaliformes are an 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 Etmoperidae 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 camouflage by co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gilbert Percy Whitley
Gilbert Percy Whitley (9 June 1903 – 18 July 1975) was a British-born Australian ichthyologist and malacologist who was curator of fishes at the Australian Museum in Sydney for about 40 years. Early life and education Gilbert Percy Whitley was born on 9 June 1903 at Swaythling, Southampton, England, the eldest child of Percy Nathan Whitley and Clara Minnie (née Moass). He was educated first at King Edward VI School, Southampton and then Osborne House School in Romsey, Hampshire. Whitley migrated with his family to Sydney Sydney is the capital city of the States and territories of Australia, state of New South Wales and the List of cities in Australia by population, most populous city in Australia. Located on Australia's east coast, the metropolis surrounds Syd ... in 1921. He started working at the Australian Museum in 1922, while studying zoology at Sydney Technical College and the University of Sydney. Career In 1925 Whitley was formally appointed to the title of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
