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Dog Shark
Squalidae, more commonly known as dogfish, dog sharks, or spiny dogfish, are one of several families of sharks categorized under Squaliformes, making it the second largest order of sharks, numbering 119 species across 7 families. Having earned their name after a group of fishermen reportedly observed the species chasing down smaller fish in dog-like packs, dogfish have slender, streamlined bodies, usually more compact in comparison to other species, and a pointed snout. Dogfish likewise have two dorsal fins, each with smooth spines, but no anal fin, and their skin is generally rough to the touch. As the species reaches adulthood, males usually measure a maximum of , while females typically measure long. The species therefore exhibits female-dominant sexual dimorphism. Dogfish sharks have slate-grey or grey-brown skin with white dots that becomes paler (almost white) around the belly region. These sharks are characterized by teeth in upper and lower jaws similar in size; a cauda ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spiny Dogfish
The spiny dogfish (''Squalus acanthias''), spurdog, mud shark, or piked dogfish is one of the best known species of the Squalidae (dogfish) family of sharks, which is part of the Squaliformes order. While these common names may apply to several species, ''Squalus acanthias'' is distinguished by two spines (one anterior to each dorsal fin) and no anal fin. It lives in shallow waters and further offshore in most parts of the world, especially in temperate waters. Those in the northern Pacific Ocean were reevaluated in 2010 and found to constitute a separate species, now called the Pacific spiny dogfish (''Squalus suckleyi''). Description and behaviour The spiny dogfish has dorsal fins, no anal fin, and white spots along its back. The caudal fin has asymmetrical lobes, forming a heterocercal tail. The species name ''acanthias'' refers to the shark's two spines. These are used defensively. If captured, the shark can arch its back to pierce its captor with spines near the dorsal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spurdog
''Squalus'' is a genus of dogfish sharks in the family Squalidae. Commonly known as spurdogs, these sharks are characterized by smooth dorsal fin spines, teeth in upper and lower jaws similar in size, caudal peduncle with lateral keels; upper precaudal pit usually present, and caudal fin without subterminal notch. In spurdogs, the hyomandibula (the bone connecting the braincase to the jaws) is oriented at a right angle to the neurocranium, while in other sharks, the hyomandibula runs more parallel to the body. This led some to think that the upper jaw of ''Squalus'' would not be as protractile as the jaws of other sharks. However, a study that compared different jaw suspension types in sharks showed that this is not the case and that ''Squalus'' is quite capable of protruding its upper jaw during feeding.Wilga, C.D., Motta, P.J. & Sanford, C.P. (2007): Evolution and ecology of feeding in elasmobranchs. ''Integrative and Comparative Biology, 47 (1): 55-69.'' The name comes from ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mandarin Dogfish2
Mandarin or The Mandarin may refer to: Language * Mandarin Chinese, branch of Chinese originally spoken in northern parts of the country ** Standard Chinese Standard Chinese ( zh, s=现代标准汉语, t=現代標準漢語, p=Xiàndài biāozhǔn hànyǔ, l=modern standard Han speech) is a modern standard form of Mandarin Chinese that was first codified during the republican era (1912–1949). ... or Modern Standard Mandarin, the official language of China ** Taiwanese Mandarin, Standard Chinese as spoken in Taiwan * Old Mandarin or Early Mandarin was the speech of northern China during the Jurchen-ruled Jin dynasty (1115–1234), Jin dynasty and the Mongol-led Yuan dynasty (12th to 14th centuries). * Mandarin (late imperial lingua franca), the spoken standard of the Ming and Qing dynasties of China Biological species * Mandarin orange (''Citrus reticulata''), a sweet, orange lookalike * Mandarin duck (''Aix galericulata''), a perching duck species found in East Asia * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Squalus Acanthias2
''Squalus'' is a genus of dogfish sharks in the family Squalidae. Commonly known as spurdogs, these sharks are characterized by smooth dorsal fin spines, teeth in upper and lower jaws similar in size, caudal peduncle with lateral keels; upper precaudal pit usually present, and caudal fin without subterminal notch. In spurdogs, the hyomandibula (the bone connecting the braincase to the jaws) is oriented at a right angle to the neurocranium, while in other sharks, the hyomandibula runs more parallel to the body. This led some to think that the upper jaw of ''Squalus'' would not be as protractile as the jaws of other sharks. However, a study that compared different jaw suspension types in sharks showed that this is not the case and that ''Squalus'' is quite capable of protruding its upper jaw during feeding.Wilga, C.D., Motta, P.J. & Sanford, C.P. (2007): Evolution and ecology of feeding in elasmobranchs. ''Integrative and Comparative Biology, 47 (1): 55-69.'' The name comes from '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Sharks
Shark is the naming term of all members of Selachimorpha suborder in the subclass Elasmobranchii, in the class Chondrichthyes. The Elasmobranchii also include rays and skates; the Chondrichthyes also include Chimaeras. The first shark-like chondrichthyans appeared in the oceans 400 million years ago, developing into the crown group of sharks by the Early Jurassic. Listed below are extant species of shark. Sharks are spread across 557 described and 23 undescribed species in eight orders. The families and genera within the orders are listed in alphabetical order. Also included is a field guide to place sharks into the correct order. Cow and frilled sharks (2 Families) * ORDER HEXANCHIFORMES ** Family Chlamydoselachidae (frilled sharks) *** Genus '' Chlamydoselachus'' Garman, 1884 **** '' Chlamydoselachus africana'' Ebert & L. J. V. Compagno, 2009 (Southern African frilled shark) **** '' Chlamydoselachus anguineus'' Garman, 1884 (frilled shark) ** Family Hexanchidae (cow shark ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barbel (anatomy)
In fish anatomy and turtle anatomy, a barbel is a slender, whisker like sensory organ near the mouth (sometimes called whiskers or tendrils). Fish that have barbels include the catfish, the carp, the goatfish, the hagfish, the sturgeon, the zebrafish, the black dragonfish and some species of shark such as the sawshark. Barbels house the taste buds of such fish and are used to search for food in murky water. The word ''barbel'' comes from Latin Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area aroun ... ''barbula'' 'little beard'. Barbels are sometimes erroneously referred to as '' barbs'', which are found in bird feathers for flight. Barbels may be located in a variety of locations on the head of a fish. "Maxillary barbels" refers to barbels on either side of the mouth. Barbels ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Southern Mandarin Dogfish
The southern Mandarin dogfish (''Cirrhigaleus australis'') is a species of Mandarin dogfish shark in the genus ''Cirrhigaleus''. It was distinguished from ''Cirrhigaleus barbifer'', which lives in the North Pacific, on an expedition in the coral reefs near Australia in 2007. It is now known to live in the temperate waters in south-eastern Australia and from the Bay of Plenty region in New Zealand, at depths of 146–640 metres.New Mandarin shark Discovered ". Practical Fishkeeping. Retrieved on 1008-10-17. Physical characteristics It is medium-sized and robust compared to other dogfish. It is grey-brown above and pale below. The posterior margins of the |
Pacific Spiny Dogfish
The Pacific spiny dogfish (''Squalus suckleyi'') is a common species of the Squalidae (dogfish) family of sharks and are among the most abundant species of sharks in the world. This species is closely related to the ''Spiny dogfish'' and for many years they were treated as a single species. Recent research, using Meristics, meristic, Morphometrics, morphological and Molecular genetics, molecular data led to the resurrection of the Pacific spiny dogfish as a separate species. The American Fisheries Society recommends the common name "Pacific spiny dogfish" for ''Squalus suckleyi'' over alternatives such as "spotted spiny dogfish" and "North Pacific spiny dogfish" and "spiny dogfish" for ''Squalus acanthias''. The maximum length of a Pacific dogfish can be , and they can live up to 100 years. ''Squalus suckleyi'' has a slower growth rate, larger maximum size, and later maturity compared to ''Squalus acanthias'' species. The slower growth rate and time of maturity could be related to ... [...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 ** ''Scymnodalati ... [...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 (sailf ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Etmopteridae
The Etmopteridae are a family of sharks in the order Squaliformes, commonly known as lantern sharks. Their name comes from the presence of light-producing photophores on their bodies. The members of this family are small, under long, and are found in deep waters worldwide. The 45 species are placed in five genera. Three-quarters of the species are in the genus ''Etmopterus''. Genera * ''Aculeola'' * ''Centroscyllium'' * ''Etmopterus ''Etmopterus'' is a genus of Etmopteridae, lantern sharks in the Squaliformes, squaliform family (biology), family Etmopteridae. They are found in deep sea ecosystems of the Atlantic Ocean, Atlantic, Indian Ocean, Indian and Pacific Oceans. Ecol ...'' * †'' Paraetmopterus'' * '' Trigonognathus'' References Shark families Taxa named by Henry Weed Fowler {{shark-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echinorhinus
''Echinorhinus'' is the only extant genus in the family Echinorhinidae. Taxonomy Echinorhinidae are traditionally classified in the order Squaliformes, together with kitefin and gulper sharks.Compagno, 2005. "Sharks of the World". However, a phylogenetic estimate based on gene capture data and mitochondrial data suggests that they are not squaliform sharks, but may be more likely to be appropriately classed in their own group, as a sister group to angel sharks and sawsharks. Phylogenetic placement of Echinorhinidae has been ambiguous in morphological and molecular studies, either being included within Squaliformes, considered sister to Squaliformes, or placed in a separate group with sawsharks (Pristiophoriformes) or angel sharks (Squatiniformes). For this reason they are sometimes given their own order, Echinorhiniformes. Etymology The name is from Greek ''echinos'' meaning "spiny" and ''rhinos'' meaning "nose". Species * ''Echinorhinus brucus'' Bonnaterre, 1788 ( bramb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
