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Kneriidae
The Kneriidae are a small family of freshwater gonorhynchiform fishes native to Africa. They typically live in fast-flowing highland streams, and are small fish, no more than in length. Some species are sexually dimorphic, with the male possessing a rosette on the gill covers that is absent in the females. Other species are neotenic, retaining larval features into adulthood. Classification About 31 species are in five genera: * Kneriinae ** ''Cromeria'' ** ''Grasseichthys'' ** ''Kneria'' ** ''Parakneria'' * Phractolaeminae ** ''Phractolaemus The hingemouth (''Phractolaemus ansorgii'') is a small freshwater fish that is found only in west central Africa, the sole member of the subfamily Phractolaeminae of the family Kneriidae. The mouth can extend like a small trunk, thus the name, a ...'' References {{Taxonbar, from=Q990619 Taxa named by Albert Günther * Ray-finned fish families de:Ohrenfische ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kneriidae
The Kneriidae are a small family of freshwater gonorhynchiform fishes native to Africa. They typically live in fast-flowing highland streams, and are small fish, no more than in length. Some species are sexually dimorphic, with the male possessing a rosette on the gill covers that is absent in the females. Other species are neotenic, retaining larval features into adulthood. Classification About 31 species are in five genera: * Kneriinae ** ''Cromeria'' ** ''Grasseichthys'' ** ''Kneria'' ** ''Parakneria'' * Phractolaeminae ** ''Phractolaemus The hingemouth (''Phractolaemus ansorgii'') is a small freshwater fish that is found only in west central Africa, the sole member of the subfamily Phractolaeminae of the family Kneriidae. The mouth can extend like a small trunk, thus the name, a ...'' References {{Taxonbar, from=Q990619 Taxa named by Albert Günther * Ray-finned fish families de:Ohrenfische ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gonorhynchiformes
The Gonorynchiformes are an order (biology), order of Actinopterygii, ray-finned fish that includes the important food source, the milkfish (''Chanos chanos'', family Chanidae), and a number of lesser-known types, both ocean, marine and freshwater. The alternate spelling "Gonorhynchiformes", with an "h", is frequently seen but not official. Gonorynchiformes have small mouths and no teeth. They are the sole group in the clade Anotophysi, a subgroup of the superorder Ostariophysi. They are characterized by a primitive Weberian apparatus formed by the first three vertebrae and one or more cephalic ribs within the head. This apparatus is believed to be a hearing organ, and is found in a more advanced and complex form in the related Cypriniformes, cypriniform fish, such as carp. Also like the cypriniforms, the gonorynchiforms produce a substance from their skin when injured that dissolves into the water and acts an alarm signal to other fish. Taxonomy Although many of the families ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cromeria
''Cromeria'' is a small genus of fish in the family Kneriidae found in fresh waters in the Sudan, Mali, and Guinea in the Nile and Niger River The Niger River ( ; ) is the main river of West Africa, extending about . Its drainage basin is in area. Its source is in the Guinea Highlands in south-eastern Guinea near the Sierra Leone border. It runs in a crescent shape through ...s of Africa. These reach a length of up to 4.4 cm. The currently recognized species are:Moritz, T., R. Britz and K.E. Linsenmair 2006. ''Cromeria nilotica and C. occidentalis, two valid species of the African freshwater fish family Kneriidae'' (Teleostei: Gonorhynchiformes). *'' Cromeria nilotica'' Boulenger, 1901 (naked shellear) *'' Cromeria occidentalis'' Daget, 1954 References *Eschmeyer, William N., ed. (1998). ''Catalog of Fishes Special Publication of the Center for Biodiversity Research and Information'', no. 1, vol 1–3. p. 2905. California Academy of Sciences: San F ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kneria
''Kneria'' is a genus of small fish in the family Kneriidae. All 13 species in this genus are restricted to Africa. Named in honor of Austrian ichthyologist Rudolf Kner (1810-1869) Species FishBase lists 13 species: * '' Kneria angolensis'' Steindachner, 1866 * '' Kneria ansorgii'' ( Boulenger, 1910) * '' Kneria auriculata'' ( Pellegrin, 1905) (Airbreathing shellear) * '' Kneria katangae'' Poll, 1976 * '' Kneria maydelli'' Ladiges & Voelker, 1961 (Cunene kneria) * '' Kneria paucisquamata'' Poll & D. J. Stewart, 1975 * '' Kneria polli'' Trewavas, 1936 (Western shellear) * '' Kneria ruaha'' Seegers, 1995 * '' Kneria rukwaensis'' Seegers, 1995 * '' Kneria sjolandersi'' Poll, 1967 * '' Kneria stappersii'' Boulenger, 1915 * '' Kneria uluguru'' Seegers, 1995 * '' Kneria wittei'' Poll, 1944 However there is another species, known as the Southern Kneria (''Kneria'' sp. 'South Africa'), occurring only in the headwaters of a few tributaries of the Crocodile River, in the In ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parakneria
''Parakneria'' is a genus of fish in the family Kneriidae, with 14 species, all of which are restricted to Africa. Species There are 14 species: * '' Parakneria abbreviata'' ( Pellegrin, 1931) * '' Parakneria cameronensis'' ( Boulenger, 1909) * '' Parakneria damasi'' Poll, 1965 * '' Parakneria fortuita'' M. J. Penrith, 1973 (Cubango kneria) * '' Parakneria kissi'' Poll, 1969 * '' Parakneria ladigesi'' Poll, 1967 * '' Parakneria lufirae'' Poll, 1965 * '' Parakneria malaissei'' Poll, 1969 * '' Parakneria marmorata'' (Norman Norman or Normans may refer to: Ethnic and cultural identity * The Normans, a people partly descended from Norse Vikings who settled in the territory of Normandy in France in the 10th and 11th centuries ** People or things connected with the Norm ..., 1923) * '' Parakneria mossambica'' R. A. Jubb & Bell-Cross, 1974 (Gorongoza kneria) * '' Parakneria spekii'' ( Günther, 1868) * '' Parakneria tanzaniae'' Poll, 1984 * '' Parakneria thysi'' Poll, 1965 * '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phractolaemus
The hingemouth (''Phractolaemus ansorgii'') is a small freshwater fish that is found only in west central Africa, the sole member of the subfamily Phractolaeminae of the family Kneriidae. The mouth can extend like a small trunk, thus the name, and has just two teeth, both in the lower jaw. The swim bladder has two compartments, and can function as a lung, allowing the hingemouth to survive in oxygen Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as wel ...-poor environments. References * * * Kneriidae Fish described in 1901 Taxa named by George Albert Boulenger Freshwater fish of Africa {{Gonorynchiformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grasseichthys
''Grasseichthys gabonensis'' is an extremely small (around 2 cm) fish native to the Ivindo and Central Congo basins of Africa Africa is the world's second-largest and second-most populous continent, after Asia in both cases. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 6% of Earth's total surface area .... It is the only member of its genus. References Endemic fauna of Gabon Kneriidae Taxa named by Jacques Géry Fish of Africa Monotypic freshwater fish genera {{Gonorynchiformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albert Günther
Albert Karl Ludwig Gotthilf Günther FRS, also Albert Charles Lewis Gotthilf Günther (3 October 1830 – 1 February 1914), was a German-born British zoologist, ichthyologist, and herpetologist. Günther is ranked the second-most productive reptile taxonomist (after George Albert Boulenger) with more than 340 reptile species described. Early life and career Günther was born in Esslingen in Swabia (Württemberg). His father was a ''Stiftungs-Commissar'' in Esslingen and his mother was Eleonora Nagel. He initially schooled at the Stuttgart Gymnasium. His family wished him to train for the ministry of the Lutheran Church for which he moved to the University of Tübingen. A brother shifted from theology to medicine, and he, too, turned to science and medicine at Tübingen in 1852. His first work was "''Ueber den Puppenzustand eines Distoma''". He graduated in medicine with an M.D. from Tübingen in 1858, the same year in which he published a handbook of zoology for students of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sexual Dimorphism
Sexual dimorphism is the condition where the sexes of the same animal and/or plant species exhibit different morphological characteristics, particularly characteristics not directly involved in reproduction. The condition occurs in most animals and some plants. Differences may include secondary sex characteristics, size, weight, colour, markings, or behavioural or cognitive traits. These differences may be subtle or exaggerated and may be subjected to sexual selection and natural selection. The opposite of dimorphism is ''monomorphism'', which is when both biological sexes are phenotypically indistinguishable from each other. Overview Ornamentation and coloration Common and easily identified types of dimorphism consist of ornamentation and coloration, though not always apparent. A difference in coloration of sexes within a given species is called sexual dichromatism, which is commonly seen in many species of birds and reptiles. Sexual selection leads to the exaggerated dim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neoteny
Neoteny (), also called juvenilization,Montagu, A. (1989). Growing Young. Bergin & Garvey: CT. is the delaying or slowing of the physiological, or somatic, development of an organism, typically an animal. Neoteny is found in modern humans compared to other primates. In progenesis or paedogenesis, sexual development is accelerated. Both neoteny and progenesis result in paedomorphism (as having the form typical of children) or paedomorphosis (changing towards forms typical of children), a type of heterochrony. It is the retention in adults of traits previously seen only in the young. Such retention is important in evolutionary biology, domestication and evolutionary developmental biology. Some authors define paedomorphism as the retention of larval traits, as seen in salamanders.Schell, S. C. ''Handbook of Trematodes of North America North of Mexico'', 1985, pg. 22 History and etymology The origins of the concept of neoteny have been traced to the Bible (as argued by Ashley Monta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taxa Named By Albert Günther
In biology, a taxon (back-formation from ''taxonomy''; plural taxa) is a group of one or more populations of an organism or organisms seen by taxonomists to form a unit. Although neither is required, a taxon is usually known by a particular name and given a particular ranking, especially if and when it is accepted or becomes established. It is very common, however, for taxonomists to remain at odds over what belongs to a taxon and the criteria used for inclusion. If a taxon is given a formal scientific name, its use is then governed by one of the nomenclature codes specifying which scientific name is correct for a particular grouping. Initial attempts at classifying and ordering organisms (plants and animals) were set forth in Carl Linnaeus's system in ''Systema Naturae'', 10th edition (1758), as well as an unpublished work by Bernard and Antoine Laurent de Jussieu. The idea of a unit-based system of biological classification was first made widely available in 1805 in the intro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freshwater Fish Of Africa
Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. Although the term specifically excludes seawater and brackish water, it does include non- salty mineral-rich waters such as chalybeate springs. Fresh water may encompass frozen and meltwater in ice sheets, ice caps, glaciers, snowfields and icebergs, natural precipitations such as rainfall, snowfall, hail/ sleet and graupel, and surface runoffs that form inland bodies of water such as wetlands, ponds, lakes, rivers, streams, as well as groundwater contained in aquifers, subterranean rivers and lakes. Fresh water is the water resource that is of the most and immediate use to humans. Water is critical to the survival of all living organisms. Many organisms can thrive on salt water, but the great majority of higher plants and most insects, amphibians, reptiles, mammals and birds need fresh water to survive. Fresh water i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
