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Oxynotus
''Oxynotus'' is a genus of sharks in the order Squaliformes, commonly known as the rough sharks. It is the only extant genus in the family Oxynotidae. They live in deep waters in the Atlantic and western Pacific Oceans. Rough sharks are small to medium in size, ranging from in adult body length, depending on species. Their bodies are compressed, giving them a triangular cross-section. They have two large dorsal fins, each with a sharp spine, and with the first fin placed far forward above the head. Even more so than their relatives, the dogfishes, they have rough and prickly skin. Unusually among sharks, they also possess a luminous organ. Species * '' Oxynotus bruniensis'' Ogilby, 1893 (prickly dogfish) * '' Oxynotus caribbaeus'' Cervigón, 1961 (Caribbean roughshark) * '' Oxynotus crochardi'' * '' Oxynotus centrina'' Linnaeus, 1758 (angular roughshark) * '' Oxynotus japonicus'' Ka. Yano & Murofushi, 1985 (Japanese roughshark) * '' Oxynotus paradoxus'' Frade, 1929 (sa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxynotus Centrina
The angular roughshark (''Oxynotus centrina'') is a rough shark of the family Oxynotidae. Taxonomy Biologist Carl Linnaeus described the angular roughshark, ''O. centrina'', in 1758. This name was later finalized and accepted by the scientific community as the official name for the species in 1976. Description At birth, they are less than and they mature at about . Most records are of individuals less than , but they can reach about . Their litter size is seven or eight pups off Angola to 23 in the Mediterranean. They have ridges over their eyes that expand into large, rounded knobs, which are covered with enlarged denticles – these are absent in other species of rough sharks. They possess very large spiracles that are vertically elongated, being almost as high as the length of their eyes. Their first dorsal spine is oriented slightly forward. They feed on worms, crustaceans, and mollusks.Compagno, L., Dando, M. and Fowler, S. ''Sharks of the World''. Princeton Field ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxynotus Paradoxus
The sailfin roughshark (''Oxynotus paradoxus'') is a species of dogfish shark in the family Oxynotidae, found in the eastern North Atlantic from Scotland to Senegal between latitudes 61°N and 11°N, at depths of between . Its length is up to . Its reproduction is ovoviviparous. ''Oxynotus paradoxus'' is thought to be a slow-moving predator of small benthic animals. The sailfin roughsharks is found near the Eastern Atlantic ocean at those depths. However, it has been reported to be found on the shores of Morocco, recently reported in the Mid-Atlantic Ridge, and in the Azores water. This species is an uncommon bycatch of bottom trawls, and is listed by the International Union for Conservation of Nature (IUCN) as Vulnerable. Taxonomy French biologist F. Frade found this species of ''Oxynotus paradoxus''. This name was later finalized and accepted by the scientific community as the official name for the species. Frade published his findings of this specimen in 1929 in the sci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxynotus Crochardi
''Oxynotus'' is a genus of sharks in the order Squaliformes, commonly known as the rough sharks. It is the only extant genus in the family Oxynotidae. They live in deep waters in the Atlantic and western Pacific Oceans. Rough sharks are small to medium in size, ranging from in adult body length, depending on species. Their bodies are compressed, giving them a triangular cross-section. They have two large dorsal fins, each with a sharp spine, and with the first fin placed far forward above the head. Even more so than their relatives, the dogfishes, they have rough and prickly skin. Unusually among sharks, they also possess a luminous organ. Species * '' Oxynotus bruniensis'' Ogilby, 1893 (prickly dogfish) * '' Oxynotus caribbaeus'' Cervigón, 1961 (Caribbean roughshark) * '' Oxynotus crochardi'' * ''Oxynotus centrina'' Linnaeus, 1758 (angular roughshark) * '' Oxynotus japonicus'' Ka. Yano & Murofushi, 1985 (Japanese roughshark) * ''Oxynotus paradoxus'' Frade, 1929 (sail ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxynotus Caribbaeus
The Caribbean roughshark (''Oxynotus caribbaeus'') is a rough shark of the family Oxynotidae, found on the upper continental slopes of the Caribbean Sea, at depths between . It reaches a length around . ''Oxynotus caribbaeus'' is thought to be a slow-moving predator of small benthic organisms. Not much is known about the lifecycle of this species, but it is being observed in its natural environment lately. This species is an uncommon bycatch of bottom trawls. Taxonomy Venezuelan biologist Dr. Fernando Cervigón described this species as ''Oxynotus caribbaeus''.Cervigón, M. F. 1961. Una nueva especie de Oxynotus de las costas de Venezuela. Estación de Investigaciones Marinas de Margarita, Fundación La Salle de Ciencias Naturales, Contribución 3:1–10 Description ''Oxynotus caribbaeus'' is a small shark found in the upper continental slope of Venezuela; it is easily distinguishable from other ''Oxynotus'' species. Adult males reach a maximum size of in length and the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxynotus Bruniensis Drawing
''Oxynotus'' is a genus of sharks in the order Squaliformes, commonly known as the rough sharks. It is the only extant genus in the family Oxynotidae. They live in deep waters in the Atlantic and western Pacific Oceans. Rough sharks are small to medium in size, ranging from in adult body length, depending on species. Their bodies are compressed, giving them a triangular cross-section. They have two large dorsal fins, each with a sharp spine, and with the first fin placed far forward above the head. Even more so than their relatives, the dogfishes, they have rough and prickly skin. Unusually among sharks, they also possess a luminous organ. Species * '' Oxynotus bruniensis'' Ogilby, 1893 (prickly dogfish) * ''Oxynotus caribbaeus'' Cervigón, 1961 (Caribbean roughshark) * ''Oxynotus crochardi'' * ''Oxynotus centrina'' Linnaeus, 1758 (angular roughshark) * '' Oxynotus japonicus'' Ka. Yano & Murofushi, 1985 (Japanese roughshark) * ''Oxynotus paradoxus'' Frade, 1929 (sailfi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxynotus Centrina Gervais
''Oxynotus'' is a genus of sharks in the order Squaliformes, commonly known as the rough sharks. It is the only extant genus in the family Oxynotidae. They live in deep waters in the Atlantic and western Pacific Oceans. Rough sharks are small to medium in size, ranging from in adult body length, depending on species. Their bodies are compressed, giving them a triangular cross-section. They have two large dorsal fins, each with a sharp spine, and with the first fin placed far forward above the head. Even more so than their relatives, the dogfishes, they have rough and prickly skin. Unusually among sharks, they also possess a luminous organ. Species * '' Oxynotus bruniensis'' Ogilby, 1893 (prickly dogfish) * ''Oxynotus caribbaeus'' Cervigón, 1961 (Caribbean roughshark) * ''Oxynotus crochardi'' * ''Oxynotus centrina'' Linnaeus, 1758 (angular roughshark) * '' Oxynotus japonicus'' Ka. Yano & Murofushi, 1985 (Japanese roughshark) * ''Oxynotus paradoxus'' Frade, 1929 (sailfi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxynotus
''Oxynotus'' is a genus of sharks in the order Squaliformes, commonly known as the rough sharks. It is the only extant genus in the family Oxynotidae. They live in deep waters in the Atlantic and western Pacific Oceans. Rough sharks are small to medium in size, ranging from in adult body length, depending on species. Their bodies are compressed, giving them a triangular cross-section. They have two large dorsal fins, each with a sharp spine, and with the first fin placed far forward above the head. Even more so than their relatives, the dogfishes, they have rough and prickly skin. Unusually among sharks, they also possess a luminous organ. Species * '' Oxynotus bruniensis'' Ogilby, 1893 (prickly dogfish) * '' Oxynotus caribbaeus'' Cervigón, 1961 (Caribbean roughshark) * '' Oxynotus crochardi'' * '' Oxynotus centrina'' Linnaeus, 1758 (angular roughshark) * '' Oxynotus japonicus'' Ka. Yano & Murofushi, 1985 (Japanese roughshark) * '' Oxynotus paradoxus'' Frade, 1929 (sa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caribbean Roughshark
The Caribbean roughshark (''Oxynotus caribbaeus'') is a rough shark of the family Oxynotidae, found on the upper continental slopes of the Caribbean Sea, at depths between . It reaches a length around . ''Oxynotus caribbaeus'' is thought to be a slow-moving predator of small benthic organisms. Not much is known about the lifecycle of this species, but it is being observed in its natural environment lately. This species is an uncommon bycatch of bottom trawls. Taxonomy Venezuelan biologist Dr. Fernando Cervigón described this species as ''Oxynotus caribbaeus''.Cervigón, M. F. 1961. Una nueva especie de Oxynotus de las costas de Venezuela. Estación de Investigaciones Marinas de Margarita, Fundación La Salle de Ciencias Naturales, Contribución 3:1–10 Description ''Oxynotus caribbaeus'' is a small shark found in the upper continental slope of Venezuela; it is easily distinguishable from other ''Oxynotus'' species. Adult males reach a maximum size of in length and the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxynotus Bruniensis
The prickly dogfish (''Oxynotus bruniensis'') is a poorly known species of dogfish shark in the family Oxynotidae, inhabiting temperate Australian and New Zealand waters. Reaching a length of , this brown to gray shark has a very thick body with a prominent "humpback" and extremely rough skin. It is further characterized by two enormous, sail-like dorsal fins placed relatively close together. Both dorsal fins have a spine embedded mostly within the fleshy leading portion of the fin; the first dorsal spine is tilted forward. Found near the sea floor over outer continental and insular shelves and upper slopes, the prickly dogfish is thought to be a slow-moving predator of small benthic organisms. It is aplacental viviparous, with females giving birth to litters of around seven pups. This species is an uncommon bycatch of bottom trawls. Taxonomy Australian ichthyologist James Douglas Ogilby originally described the prickly dogfish from a desiccated specimen discovered on a beach ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxynotus Japonicus
The Japanese roughshark (''Oxynotus japonicus'') is a rare species of shark in the family Oxynotidae, known only from a handful of specimens recovered from Suruga Bay and the Enshunada Sea off Japan. It is a benthic species that occurs at a depth of . This shark is caught (and discarded) as bycatch by bottom trawlers throughout its entire limited range, and may be threatened given the declines in other bottom deep sea species in Suruga Bay. This species grows to long. It is similar to other rough sharks in having a stout, high trunk, a dorsally depressed head, and two sail-like dorsal fins with deeply embedded spines. The snout is short, with large nostrils whose lateral and medial apertures are separated by a thick nasal flap. The eyes and spiracles are oval in shape. The five pairs of gill slits are very small and vertical. The mouth is small, with thick, fleshy lips; the teeth in the upper jaw are narrow, erect, and smooth-edged, while those in the lower jaw are broad, ... [...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] |
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] |
