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Straight-tooth Weasel Shark
The straight-tooth weasel shark, ''Paragaleus tengi'', is a weasel shark of the family Hemigaleidae, found in the tropical western Pacific Ocean. It can reach a length of 88 cm. ''Paragaleus tengi'' is distinctive for its color and size. Specifically, its solid grey dorsal (upper) color, short snout, and 2-3 rows of lower teeth are a few of the characteristic traits that aid in distinguishing between this species of shark and others, like the ''Paragaleus pectoralis'' (White & Harris, 2013). The reproduction of this shark is viviparous Among animals, viviparity is development of the embryo inside the body of the parent. This is opposed to oviparity which is a reproductive mode in which females lay developing eggs that complete their development and hatch externally from the .... References * Paragaleus Fish described in 1963 {{Shark-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johnson T
Johnson is a surname of Anglo-Norman origin meaning "Son of John". It is the second most common in the United States and 154th most common in the world. As a common family name in Scotland, Johnson is occasionally a variation of ''Johnston'', a habitational name. Etymology The name itself is a patronym of the given name '' John'', literally meaning "son of John". The name ''John'' derives from Latin '' Johannes'', which is derived through Greek ''Iōannēs'' from Hebrew '' Yohanan'', meaning "Yahweh has favoured". Origin The name has been extremely popular in Europe since the Christian era as a result of it being given to St John the Baptist, St John the Evangelist and nearly one thousand other Christian saints. Other Germanic languages * Swedish: Johnsson, Jonsson * Icelandic: Jónsson See also * List of people with surname Johnson * Gjoni (Gjonaj) * Ioannou * Jensen *Johansson * Johns * Johnsson * Johnston *Johnstone *Jones * Jonson *Jonsson *Jovanović Jovanovi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carcharhiniformes
Carcharhiniformes , the ground sharks, are the largest order of sharks, with over 270 species. They include a number of common types, such as catsharks, swellsharks, and the sandbar shark. Members of this order are characterized by the presence of a nictitating membrane over the eye, two dorsal fins, an anal fin, and five gill slits. The families in the order Carcharhiniformes are expected to be revised; recent DNA studies show that some of the conventional groups are not monophyletic. The oldest members of the order appeared during the Middle-Late Jurassic, which have teeth and bodyforms that are morphologically similar to living catsharks. Carchariniformes first underwent major diversification during the Late Cretaceous, initially as small-sized forms, before radiating into medium and large body sizes during the Cenozoic. Families According to FishBase, the nine families of ground sharks are: [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Family (biology)
Family ( la, familia, plural ') is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks between the ranks of family and genus. The official family names are Latin in origin; however, popular names are often used: for example, walnut trees and hickory trees belong to the family Juglandaceae, but that family is commonly referred to as the "walnut family". What belongs to a family—or if a described family should be recognized at all—are proposed and determined by practicing taxonomists. There are no hard rules for describing or recognizing a family, but in plants, they can be characterized on the basis of both vegetative and reproductive features of plant species. Taxonomists often take different positions about descriptions, and there may be no broad consensus across the scientific community for some time. The publishing of new data and opi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemigaleidae
The weasel sharks are a family, the Hemigaleidae, of ground sharks found from the eastern Atlantic Ocean to the continental Indo-Pacific. They are found in shallow coastal waters to a depth of . Most species are small, reaching no more than long, though the snaggletooth shark (''Hemipristis elongatus'') may reach . They have horizontally oval eyes, small spiracles, and precaudal pits. Two dorsal fins occur with the base of the first placed well forward of the pelvic fins. The caudal fin has a strong ventral lobe and undulations on the dorsal lobe margin. They feed on a variety of small bony fishes and invertebrates; at least two species specialize on cephalopods. They are not known to have attacked people. Genera and species The eight known species in this family are placed in four genera. ''Hemipristis'' is placed in the subfamily Hemipristinae, while ''Chaenogaleus'', ''Hemigaleus'', and ''Paragaleus'' are placed in the subfamily Hemigaleinae.Haaramo, M. (2005)Hemigaleida ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tropical
The tropics are the regions of Earth surrounding the Equator. They are defined in latitude by the Tropic of Cancer in the Northern Hemisphere at N and the Tropic of Capricorn in the Southern Hemisphere at S. The tropics are also referred to as the tropical zone and the torrid zone (see geographical zone). In terms of climate, the tropics receive sunlight that is more direct than the rest of Earth and are generally hotter and wetter as they aren't affected as much by the Season, solar seasons. The word "tropical" sometimes refers to this sort of climate in the zone rather than to the geographical zone itself. The tropical zone includes deserts and snow-capped mountains, which are not tropical in the climatic sense. The tropics are distinguished from the other climatic and biomatic regions of Earth, which are the middle latitudes and the polar regions of Earth, polar regions on either side of the equatorial zone. The tropics constitute 40% of Earth's surface area and contain ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pacific Ocean
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 continents of Asia and Oceania in the west and the Americas in the east. At in area (as defined with a southern Antarctic border), this largest division of the World Ocean—and, in turn, the hydrosphere—covers about 46% of Earth's water surface and about 32% of its total surface area, larger than Earth's entire land area combined .Pacific Ocean . '' Britannica Concise.'' 2008: Encyclopædia Britannica, Inc. The centers of both the [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atlantic Weasel Shark
The Atlantic weasel shark (''Paragaleus pectoralis'') is a Hemigaleidae, weasel shark of the family (biology), family Hemigaleidae, found in the eastern Atlantic Ocean. Also known as the little tiger shark, it is the only species of the genus ''Paragaleus'' to have been recorded off the western coast of Africa.C. Capape, Y Diatta, M Diop, C Reynaud, O Guelorget (2005). “New data on the reproductive biology of the Atlantic weasel shark, Paragaleus pectoralis (Chondrichthyes: Hemigaleidae) from the coast of Senegal (eastern tropical Atlantic)”. ''International Journal of Ichthyology'' 29(4):363-371 It is one of four species of small sharks within the carcharhinoid genus ''Paragaleus'', including Whitetip weasel shark, ''Paragaleus leucolomatus'' (whitetip weasel shark), Straight-tooth weasel shark, ''Paragaleus tengi'' (straight-tooth weasel shark), and Slender weasel shark, ''Paragaleus randalli'' (slender weasel shark). It also one of eight species within the weasel shark famil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Viviparous
Among animals, viviparity is development of the embryo inside the body of the parent. This is opposed to oviparity which is a reproductive mode in which females lay developing eggs that complete their development and hatch externally from the mother. The term 'viviparity' and its adjective form 'viviparous' derive from the Latin ''vivus'' meaning "living" and ''pario'' meaning "give birth to". Reproductive mode Five modes of reproduction have been differentiated in animals based on relations between zygote and parents. The five include two nonviviparous modes: ovuliparity, with external fertilisation, and oviparity, with internal fertilisation. In the latter, the female lays zygotes as eggs with a large yolk; this occurs in all birds, most reptiles, and some fishes. These modes are distinguished from viviparity, which covers all the modes that result in live birth: *Histotrophic viviparity: the zygotes develop in the female's oviducts, but find their nutrients by oopha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paragaleus
''Paragaleus'' is a genus of weasel shark in the family Hemigaleidae. This genus has a rounded or slightly pointed snout, short gill slits, and a broadly arched mouth. The upper teeth have long cusps, and no toothless spaces occur at the jaw midlines. The dorsal and pelvic fins and the lower caudal lobe are not falchate in shape. Known fossil species include '' P. pulchellus'' and '' P. antunesi''. * Whitetip weasel shark (''Paragaleus leucolomatus'') Compagno & Smale, 1985 (whitetip weasel shark* Atlantic weasel shark (''Paragaleus pectoralis'') ( Garman, 1906) (Atlantic weasel shark* Slender weasel shark (''Paragaleus randalli'') Compagno, Krupp & K. E. Carpenter, 1996 (slender weasel shark* Straight-tooth weasel shark The straight-tooth weasel shark, ''Paragaleus tengi'', is a weasel shark of the family Hemigaleidae, found in the tropical western Pacific Ocean. It can reach a length of 88 cm. ''Paragaleus tengi'' is distinctive for its color and size. ... (''Par ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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