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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 ** ''Scymnodalatias ... [...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] |
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] |
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. 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 some .... 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 longnose velvet dogfish {{Shark-stub ... [...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 Fish described in 1910 {{Shark-stub ... [...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 650 and 920 m. Its length is up to 68 cm. 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 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 some .... References Scymnodon Fish described in 1906 {{Shark-stub ... [...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 term used as a "bridging" form of reproduction between egg-laying oviparous and live-bearing viviparous reproduction. Ovoviviparous animals possess embryos that develop insi .... References Scymnodon Fish described in 1984 {{Shark-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scymnodon
''Scymnodon'' is a genus of squaliform sharks in the family 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) * ''Scymnodon ringens The knifetooth dogfish (''Scymnodon ringens''), is a harmless sleeper shark of the family Somniosidae, found in the eastern Atlantic, from Scotland to Spain, Portugal, and Senegal, and the southwest Pacific from New Zealand, between latitude ... [...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. 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 some .... 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 longnose velvet dogfish {{Shark-stub ... [...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 some .... 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 definition, to Antarctica) in the south, and is bounded by the contine ... 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 term used as a "bridging" form of reproduction between egg-laying oviparous and live-bearing viviparous reproduction. Ovoviviparous animals possess embryos that develop insi .... References * {{DEFAULTSORT:dogfish, Azores Azores dogfish Endemic fauna of the Azores Azores dogfish ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
