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Rhizoprionodon
''Rhizoprionodon'' is a genus of requiem sharks, and part of the family Carcharhinidae, commonly known as sharpnose sharks because of their long, pointed snouts. Species * '' Rhizoprionodon acutus'' ( Rüppell, 1837) (milk shark) * '' Rhizoprionodon lalandii'' ( J. P. Müller & Henle, 1839) (Brazilian sharpnose shark) * '' Rhizoprionodon longurio'' ( D. S. Jordan & C. H. Gilbert, 1882) (Pacific sharpnose shark) * '' Rhizoprionodon oligolinx'' V. G. Springer, 1964 (grey sharpnose shark) * '' Rhizoprionodon porosus'' ( Poey, 1861) (Caribbean sharpnose shark) * '' Rhizoprionodon taylori'' ( Ogilby, 1915) (Australian sharpnose shark) * '' Rhizoprionodon terraenovae'' ( J. Richardson, 1836) (Atlantic sharpnose shark) See also * List of sharks * List of prehistoric cartilaginous fish genera 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Milk Shark
The milk shark (''Rhizoprionodon acutus'') is a species of requiem shark, and part of the family (biology), family Requiem shark, Carcharhinidae, whose common name comes from an Indian belief that consumption of its meat promotes lactation. The largest and most widely distributed member of its genus, the milk shark typically measures long, and can be found in coastal tropical waters throughout the eastern Atlantic and the Indo-Pacific regions. Occurring from the surface to a depth of , this species is common near beaches and in estuary, estuaries, and has been recorded swimming up rivers in Cambodia. Juveniles are known to inhabit tidal pools and seagrass meadows. The milk shark has a slender body with a long, pointed snout and large eyes, and is a nondescript gray above and white below. This shark can be distinguished from similar species in its range by the long furrows at the corners of its mouth, and seven to 15 enlarged pores just above them. Among the most abundant sharks w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atlantic Sharpnose Shark
The Atlantic sharpnose shark (''Rhizoprionodon terraenovae'') is a species of requiem shark in the family Carcharhinidae. It is found in the subtropical waters of the north-western Atlantic Ocean, between latitudes 43°N and 18°N. Description The Atlantic sharpnose shark is a small shark in comparison to others. The Atlantic sharpnose shark's maximum species length is known to be about . Although its average adult size tends to be about . Reports exist of these sharks living up to 19 years in the wild. A distinctive feature is that juveniles have black edges on the dorsal and caudal fins. Rhizoprionodon terraenovae SI2.jpg, Top view Rhizoprionodon terraenovae SI3.jpg, Head, bottom view Rhizoprionodon terraenovae jaws.jpg, Jaws Rhizoprionodon terraenovae upper teeth.jpg, Upper teeth Rhizoprionodon terraenovae lower teeth.jpg, Lower teeth Habitat Atlantic sharpnose sharks can be found as far north as New Brunswick, Canada, to as far south as the southern Gulf of Mexico. Repor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brazilian Sharpnose Shark
The Brazilian sharpnose shark (''Rhizoprionodon lalandii'') is a requiem shark of the family Carcharhinidae. It is found in the tropical waters of the western Atlantic Ocean between latitudes 13° N and 33° S, at depths between 3 and 70 m. It has been recorded in the following countries: Aruba, Brazil, Colombia, French Guiana, Guyana, Panama, Suriname, Trinidad and Tobago and Venezuela. It can reach a length of 77 cm. It is considered a vulnerable species in Brazil due to intensive fishing although it may actually classify at a higher level. The flesh is eaten for food but the fins are not used as they are too small. Other threats include water pollution from plastic litter and three specimens have been found with plastic collars on their head or gills. The shark feeds on teleostei and squid. Research showed the shark may be an important predator of demersal and pelagic The pelagic zone consists of the water column of the open ocean and can be further divi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caribbean Sharpnose Shark
The Caribbean sharpnose shark (''Rhizoprionodon porosus'') is a requiem shark, and part of the family Carcharhinidae. Distribution and habitat It is found in the tropical waters of the western Atlantic Ocean and the Caribbean, between latitudes 28° N and 40° S, from the surface to a depth of 500 m. Description The maximum reported size for the Caribbean sharpnose shark is . The average adult size appears to be about . Both sexes seem to reach maturity at about in length, and just over 2 years old. The life span is estimated to be about 8–10 years old. Taxonomy The species was once confused as being the same species as the Atlantic sharpnose shark The Atlantic sharpnose shark (''Rhizoprionodon terraenovae'') is a species of requiem shark in the family Carcharhinidae. It is found in the subtropical waters of the north-western Atlantic Ocean, between latitudes 43°N and 18°N. Description ... - however difference in vertebra counts indicate that it is a separ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhizoprionodon
''Rhizoprionodon'' is a genus of requiem sharks, and part of the family Carcharhinidae, commonly known as sharpnose sharks because of their long, pointed snouts. Species * '' Rhizoprionodon acutus'' ( Rüppell, 1837) (milk shark) * '' Rhizoprionodon lalandii'' ( J. P. Müller & Henle, 1839) (Brazilian sharpnose shark) * '' Rhizoprionodon longurio'' ( D. S. Jordan & C. H. Gilbert, 1882) (Pacific sharpnose shark) * '' Rhizoprionodon oligolinx'' V. G. Springer, 1964 (grey sharpnose shark) * '' Rhizoprionodon porosus'' ( Poey, 1861) (Caribbean sharpnose shark) * '' Rhizoprionodon taylori'' ( Ogilby, 1915) (Australian sharpnose shark) * '' Rhizoprionodon terraenovae'' ( J. Richardson, 1836) (Atlantic sharpnose shark) See also * List of sharks * List of prehistoric cartilaginous fish genera 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Prehistoric Cartilaginous Fish Genera
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] |
Requiem Shark
Requiem sharks are sharks of the family Carcharhinidae in the order Carcharhiniformes. They are migratory, live-bearing sharks of warm seas (sometimes of brackish or fresh water) and include such species as the bull shark, lemon shark, blacktip shark, and whitetip reef shark. Family members have the usual carcharhiniform characteristics. Their eyes are round, and one or two gill slits fall over the pectoral fin base. Most species are viviparous, the young being born fully developed. They vary widely in size, from as small as adult length in the Australian sharpnose shark, up to adult length in the oceanic whitetip shark.Compagno, L.J.VFamily Carcharhinidae - Requiem sharksin Froese, R. and D. Pauly. Editors. 2010FishBase World Wide Web electronic publication, version (10/2013). Scientists assume that the size and shape of their pectoral fins have the right dimensions to minimize transport cost. Requiem sharks tend to live in more tropical areas, but tend to migrate. Fem ... [...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] |
Pacific Sharpnose Shark
The Pacific sharpnose shark (''Rhizoprionodon longurio'') often migrates along the Pacific coast of Mexico. They are most commonly caught in the artisanal fishery of Mazatlán Mazatlán () is a city in the Mexican list of states of Mexico, state of Sinaloa. The city serves as the municipal seat for the surrounding , known as the Mazatlán Municipality. It is located on the Pacific Ocean, Pacific coast across from th .... When a large sample of Pacific sharpnose sharks were observed scientists concluded that this type of shark was a "viviparous shark of small size which is born at an average length of 31 cm." Their gestation period is between ten and eleven months. There was found to be no statistical relationship between the number of embryos to the average length as a result of scientific research. Specialists David Corro, Leonardo Castillo Geniz and J. Fernando Marquez-Farias, found that the sex ratio of this specific Shark is one to one with the average number of e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grey Sharpnose Shark
The grey sharpnose shark (''Rhizoprionodon oligolinx'') is a requiem shark of the family Carcharhinidae. It is found in the tropical waters of the Indo-West Pacific Oceans, between latitudes 30° N and 18° S, from the surface to a depth of 36 m. It can reach a length of about 70 cm. It is fished in the Gazetteer Indo-West Pacific and the waters from the Persian Gulf east to Thailand, Indonesia, China, and Japan. It has also been found in the Gulf of Carpentaria and Palau. In appearance and size, this species is very close to Rhizoprionodon taylori. The diet of the grey sharpnose shark consists of crustaceans, fishes, and cephalopods. It is commonly caught by inshore demersal gillnet fisheries, especially off Java for fish meal Fish meal (sometimes spelled fishmeal) is a commercial product made from whole wild-caught fish, bycatch, and fish by-products to feed farm animals, such as pigs, poultry, and farmed fish.R. D. Miles and F. A. Chapman.FA122: The Ben ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eocene
The Eocene ( ) is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (Ma). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene'' comes from the Ancient Greek (''Ēṓs'', 'Eos, Dawn') and (''kainós'', "new") and refers to the "dawn" of modern ('new') fauna that appeared during the epoch.See: *Letter from William Whewell to Charles Lyell dated 31 January 1831 in: * From p. 55: "The period next antecedent we shall call Eocene, from ήως, aurora, and χαινος, recens, because the extremely small proportion of living species contained in these strata, indicates what may be considered the first commencement, or ''dawn'', of the existing state of the animate creation." The Eocene spans the time from the end of the Paleocene Epoch to the beginning of the Oligocene Epoch. The start of the Eocene is marked by a brief period in which the concentration of the carbon isoto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
