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Onesided Livebearer
''Jenynsia'' is a genus of freshwater fishes in the family Anablepidae. Like '' Anableps'' species, they are onesided livebearers: some sources indicate that they only mate on one side, right-"handed" males with left-"handed" females and vice versa. However other sources dispute this. These South American fish are viviparous. Distribution Species of the genus are distributed in the Río de la Plata Basin and Atlantic coastal drainages from Río Negro Province, Argentina, to the city of Rio de Janeiro, Brazil, and in the Andean drainages of northwest Argentina and southern Bolivia. Taxonomy ''Jenynsia'' is the sister group to the genus '' Anableps'' and both are classified in the subfamily Anablepinae; together with the genus ''Oxyzygonectes'' they compose the family Anablepidae. ''Jenynsia'' contains two subgenera. Members of the subgenus ''Plesiojenysia'' Ghedotti, 1998, are distributed in the uplands of southern Brazil. Members of the subgenus ''Jenynsia'' are mor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jenynsia Multidentata
''Jenynsia multidentata'' is a species of killifish from the Family (biology), family Anablepidae. It is a Viviparity, viviparous, Demersal fish, benthopelagic species in the genus Onesided livebearer, ''Jenynsia''. They are onesided livebearers with a clear asymmetry of the males' genitalia. With onset of maturity, the anal fin of male fish develops into a gonopodium which can be brought forward on one side only. Based on the bending to the left or to the right of the tip of the gonopodium, two morphs of male fish can be distinguished. Taxonomy The species ''Jenynsia multidentata'' was originally described in 1842 as ''Lebias multidentata'' by the naturalist Leonard Jenyns. Accepted synonyms are ''Fitzroyia multidentata'' also described by Jenyns in 1842 and ''Poecilia punctata'' which was suggested by Valenciennes in 1846. Geographical distribution ''Jenynsia multidentata'' is the most widespread species of the genus Onesided livebearer, ''Jenynsia''. The distribution is r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brazil
Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area and the seventh most populous. Its capital is Brasília, and its most populous city is São Paulo. The federation is composed of the union of the 26 states and the Federal District. It is the largest country to have Portuguese as an official language and the only one in the Americas; one of the most multicultural and ethnically diverse nations, due to over a century of mass immigration from around the world; and the most populous Roman Catholic-majority country. Bounded by the Atlantic Ocean on the east, Brazil has a coastline of . It borders all other countries and territories in South America except Ecuador and Chile and covers roughly half of the continent's land area. Its Amazon basin includes a vast tropical forest, ho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pedro F
Pedro is a masculine given name. Pedro is the Spanish, Portuguese, and Galician name for ''Peter''. Its French equivalent is Pierre while its English and Germanic form is Peter. The counterpart patronymic surname of the name Pedro, meaning "son of Peter" (compare with the English surname Peterson) is Pérez in Spanish, and Peres in Galician and Portuguese, Pires also in Portuguese, and Peiris in coastal area of Sri Lanka (where it originated from the Portuguese version), with all ultimately meaning "son of Pêro". The name Pedro is derived via the Latin word "petra", from the Greek word "η πέτρα" meaning "stone, rock". The name Peter itself is a translation of the Aramaic ''Kephas'' or ''Cephas'' meaning "stone". An alternate archaic spelling is ''Pêro''. Pedro may refer to: Notable people Monarchs, mononymously * Pedro I of Portugal *Pedro II of Portugal *Pedro III of Portugal *Pedro IV of Portugal, also Pedro I of Brazil *Pedro V of Portugal * Pedro II of Bra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henry Weed Fowler
Henry Weed Fowler (March 23, 1878 – June 21, 1965) was an American zoologist born in Holmesburg, Pennsylvania. He studied at Stanford University under David Starr Jordan. He joined the Academy of Natural Sciences in Philadelphia and worked as an assistant from 1903 to 1922, associate curator of vertebrates from 1922 to 1934, curator of fish and reptiles from 1934 to 1940 and curator of fish from 1940 to 1965. He published material on numerous topics including crustaceans, birds, reptiles and amphibians, but his most important work was on fish. In 1927 he co-founded the American Society of Ichthyologists and Herpetologists and acted as treasurer until the end of 1927. In 1934 he went to Cuba, alongside Charles Cadwalader (president of the Academy of Natural Sciences of Philadelphia), at the invitation of Ernest Hemingway to study billfishes, he stayed with Hemingway for six weeks and the three men developed a friendship which continued after this trip and Hemingway sent spe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cusp (dentistry)
A cusp is a pointed, projecting, or elevated feature. In animals, it is usually used to refer to raised points on the crowns of teeth. The concept is also used with regard to the leaflets of the four heart valves. The mitral valve, which has two cusps, is also known as the bicuspid valve, and the tricuspid valve has three cusps. In humans A cusp is an occlusal or incisal eminence on a tooth. Canine teeth, otherwise known as cuspids, each possess a single cusp, while premolars, otherwise known as bicuspids, possess two each. Molars normally possess either four or five cusps. In certain populations the maxillary molars, especially first molars, will possess a fifth cusp situated on the mesiolingual cusp known as the Cusp of Carabelli. Buccal Cusp- One other variation of the upper first premolar is the 'Uto-Aztecan' upper premolar. It is a bulge on the buccal cusp that is only found in Native American Indians, with highest frequencies of occurrence in Arizona. The name is n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anal Fin
Fins are distinctive anatomical features composed of bony spines or rays protruding from the body of a fish. They are covered with skin and joined together either in a webbed fashion, as seen in most bony fish, or similar to a flipper, as seen in sharks. Apart from the tail or caudal fin, fish fins have no direct connection with the spine and are supported only by muscles. Their principal function is to help the fish swim. Fins located in different places on the fish serve different purposes such as moving forward, turning, keeping an upright position or stopping. Most fish use fins when swimming, flying fish use pectoral fins for gliding, and frogfish use them for crawling. Fins can also be used for other purposes; male sharks and mosquitofish use a modified fin to deliver sperm, thresher sharks use their caudal fin to stun prey, reef stonefish have spines in their dorsal fins that inject venom, anglerfish use the first spine of their dorsal fin like a fishing rod to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxyzygonectes
The white-eye (''Oxyzygonectes dovii'') is a species of killifish of the family Anablepidae. This species is the only member of its genus, ''Oxyzygonectes'', and the subfamily Oxyzygonectinae. This fish species is found in Pacific drainages in Nicaragua, Costa Rica, and Panama. ''O. dovii'' has no gonopodium like the other members of its family. The dorsal and anal fins are posteriorly placed just before the caudal peduncle and well behind the midbody. The reach a maximum length of about 15 centimetres (6 in) TL. Many of these fish inhabit brackish waters. They are found in rivers of low elevation, up to 15 metres (50 ft) above sea level. These fish feed on detritus, algae, and sometimes on terrestrial insects. Though it occurs in estuaries, it breeds in freshwater. This species is not a seasonal killifish. ''O. dovii'' has been bred in captivity. Etymology The fish is named in honor of John Melmoth Dow (1827-1892), of the Panama Railroad Company The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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