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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] |
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] |
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] |
Scymnodon Macracanthus
The largespine velvet dogfish (''Scymnodon macracanthus'') is a shark of the family Somniosidae, found on the lower continental slopes between latitudes 50°S and 54°S in the southeast Pacific Ocean from the Straits of Magellan, and the southwest Pacific from New Zealand, at depths of between . Its length is up to . It was originally in the genus '' Centroscymnus'' because of the shape of its dermal denticles and dorsal fin spines but some argued to put it in the genus ''Scymnodon'' because of its shape of dermal denticles. While some wanted to allocate these in ''Centroscymnus'' because of the shape of its lower teeth but later it was allocated to a distinct genus called ''Proscymnodon''. Conservation status The New Zealand Department of Conservation has classified the largespine velvet dogfish as "Not Threatened" with the qualifier "Uncertain whether Threatened Overseas" under the New Zealand Threat Classification System The New Zealand Threat Classification System ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Centroselachus Crepidater
The longnose velvet dogfish (''Centroselachus crepidater'') is a sleeper shark of the family Somniosidae, found circumglobally in southern hemisphere subtropical seas, at depths of between 230 and 1,500 m. It reaches a length of 130 cm. It has a diet consisting of predominantly mesopelagic fishes and squids. Conservation status The New Zealand Department of Conservation has classified the longnose velvet dogfish as "Not Threatened" with the qualifier "Secure Overseas" under the New Zealand Threat Classification System The New Zealand Threat Classification System is used by the Department of Conservation to assess conservation priorities of species in New Zealand. The system was developed because the IUCN Red List, a similar conservation status system, had s .... References longnose velvet dogfish Fish of the East Atlantic Marine fish of Eastern Australia Fish of Chile Fish of Japan Fish of Namibia Marine fish of New Zealand Taxa named by José Vic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scymnodon Plunketi
The plunket shark or Plunket's shark (''Scymnodon plunketi'') is a sleeper shark of the family Somniosidae, found around south eastern Australia, and New Zealand, at depths of between 220 and 1,550 m over continental shelves A continental shelf is a portion of a continent that is submerged under an area of relatively shallow water, known as a shelf sea. Much of these shelves were exposed by drops in sea level during glacial periods. The shelf surrounding an island .... It reaches a length of 130 cm.White, W.T., Vaz, D.F.B., Ho, H.-C., Ebert, D.A., Carvalho, M.R.d., Corrigan, S., Rochel, E., Carvalho, M.d., Tanaka, S. & Naylor, G.J.P. (2014): Redescription of ''Scymnodon ichiharai'' Yano and Tanaka 1984 (Squaliformes: Somniosidae) from the western North Pacific, with comments on the definition of somniosid genera. ''Ichthyological Research, 62 (2): 213-229.'' References * Scymnodon Taxa named by Edgar Ravenswood Waite Fish described in 1910 {{Shark- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scymnodon Ichiharai
The Japanese velvet dogfish (''Scymnodon ichiharai'') is a harmless deepwater sleeper shark of the family Somniosidae, found in the northwest Pacific from Suruga Bay and adjacent waters of Japan at depths of between .White, W.T., Vaz, D.F.B., Ho, H.-C., Ebert, D.A., Carvalho, M.R.d., Corrigan, S., Rochel, E., Carvalho, M.d., Tanaka, S. & Naylor, G.J.P. (2014): Redescription of ''Scymnodon ichiharai'' Yano and Tanaka 1984 (Squaliformes: Somniosidae) from the western North Pacific, with comments on the definition of somniosid genera. ''Ichthyological Research, 62 (2): 213-229.'' Reproduction is ovoviviparous Ovoviviparity, ovovivipary, ovivipary, or aplacental viviparity is a "bridging" form of reproduction between egg-laying oviparity, oviparous and live-bearing viviparity, viviparous reproduction. Ovoviviparous animals possess embryos that develo .... References Scymnodon Taxa named by Kazunari Yano Taxa named by Shigeho "Sho" Tanaka II, 1984 Fish described in 1984< ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scymnodon
''Scymnodon'' is a genus of squaliform sharks in the family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ... Somniosidae. Species There are currently four recognized species in this genus: * '' Scymnodon ichiharai'' Ka. Yano & S. Tanaka (II), 1984 (Japanese velvet dogfish) White, W.T., Vaz, D.F.B., Ho, H.-C., Ebert, D.A., Carvalho, M.R.d., Corrigan, S., Rochel, E., Carvalho, M.d., Tanaka, S. & Naylor, G.J.P. (2014): Redescription of ''Scymnodon ichiharai'' Yano and Tanaka 1984 (Squaliformes: Somniosidae) from the western North Pacific, with comments on the definition of somniosid genera. ''Ichthyological Research, 62 (2): 213-229.'' * '' Scymnodon macracanthus'' ( Regan, 1906) (largespine velvet dogfish) * '' Scymnodon plunketi'' ( Waite, 1910) (Plunket's shark) * '' Scymno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Centroscymnus Coelolepis
The Portuguese dogfish (''Centroscymnus coelolepis'') or Portuguese shark, is a species of sleeper shark of the family Somniosidae. This globally distributed species has been reported down to a depth of , making it the deepest-living shark known. It inhabits lower continental slopes and abyssal plains, usually staying near the bottom. Stocky and dark brown in color, the Portuguese dogfish can be distinguished from similar-looking species (such as the kitefin shark, ''Dalatias licha'') by the small spines in front of its dorsal fins. Its dermal denticles are also unusual, resembling the scales of a bony fish. This species typically reaches in length; sharks in the Mediterranean Sea are much smaller and have distinct depth and food preferences. Relatively common, the Portuguese dogfish is an active hunter capable of tackling fast, large prey. It feeds mainly on cephalopods and fishes, though it also consumes invertebrates and cetacean carrion. This shark has acute vision optimized ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Centroselachus
The longnose velvet dogfish (''Centroselachus crepidater'') is a sleeper shark of the family Somniosidae, found circumglobally in southern hemisphere subtropical seas, at depths of between 230 and 1,500 m. It reaches a length of 130 cm. It has a diet consisting of predominantly mesopelagic fishes and squids. Conservation status The New Zealand Department of Conservation has classified the longnose velvet dogfish as "Not Threatened" with the qualifier "Secure Overseas" under the New Zealand Threat Classification System The New Zealand Threat Classification System is used by the Department of Conservation to assess conservation priorities of species in New Zealand. The system was developed because the IUCN Red List, a similar conservation status system, had s .... References longnose velvet dogfish Fish of the East Atlantic Marine fish of Eastern Australia Fish of Chile Fish of Japan Fish of Namibia Marine fish of New Zealand Taxa named by José Vi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scymnodalatias Sherwoodi
The sherwood dogfish or Sherwood's dogfish (''Scymnodalatias sherwoodi'') is a very rare sleeper shark of the family Somniosidae, found only around New Zealand. The only specimen studied was about 80 cm long. The sherwood dogfish is ovoviviparous. Conservation status In June 2018 the New Zealand Department of Conservation classified the sherwood dogfish as "Not Threatened" with the qualifier "Secure Overseas" under the New Zealand Threat Classification System The New Zealand Threat Classification System is used by the Department of Conservation to assess conservation priorities of species in New Zealand. The system was developed because the IUCN Red List, a similar conservation status system, had s .... References {{DEFAULTSORT:Sherwood dogfish Scymnodalatias Endemic marine fish of New Zealand Fish described in 1921 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scymnodalatias Oligodon
The sparsetooth dogfish (''Scymnodalatias oligodon'') is a very rare sleeper shark of the family Somniosidae, the holotype of which was taken in the subtropical southeast Pacific The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is bounded by the cont ... at a depth of up to 200 m. Its biology is unknown. References * Scymnodalatias Fish described in 1988 {{Shark-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scymnodalatias Garricki
The Azores dogfish (''Scymnodalatias garricki'') is a very rare sleeper shark of the family Somniosidae. It is known only from the holotype caught north of the Azores and another caught in 2001. The Azores dogfish lives in the northeastern Atlantic Ocean at depths of 300-2000m. Like most sharks, it is ovoviviparous Ovoviviparity, ovovivipary, ovivipary, or aplacental viviparity is a "bridging" form of reproduction between egg-laying oviparity, oviparous and live-bearing viviparity, viviparous reproduction. Ovoviviparous animals possess embryos that develo .... References * {{DEFAULTSORT:dogfish, Azores Azores dogfish Endemic fauna of the Azores Azores dogfish ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
