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Kneriidae
The Kneriidae are a small family of freshwater Gonorhynchiformes, gonorhynchiform fishes native to sub-Saharan Africa. The species in this family typically live in fast-flowing streams, often in highlands, and are small fish, no more than in length. The second subfamily Phractolaeminae contains only a single species, which typically inhabits stagnant or slow-moving waters and reaches up to in length. All Kneriidae have an elongated body shape. Some species are sexual dimorphism, 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 There are about 31 extant (living) species in four genera. Phractolaemidae is now regarded as a full family. Genera * ''Cromeria'' George Albert Boulenger, Boulenger, 1901 * ''Grasseichthys'' Jacques Géry, Géry, 1964 * ''Kneria'' Franz Steindachner, Steindachner, 1866 * ''Parakneria'' Max Poll, Poll, 1965 In addi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kneria
''Kneria'' is a genus of small fish in the family Kneriidae. All the species in this genus are restricted to Africa. Named in honor of Austrian ichthyologist Rudolf Kner (1810-1869) Species The following species are included in this genus: * '' Kneria angolensis'' Steindachner, 1866 * '' Kneria ansorgii'' ( Boulenger, 1910) * '' Kneria auriculata'' ( Pellegrin, 1905) (Airbreathing shellear) * '' Kneria katangae'' Poll, 1976 * '' Kneria luansaensis'' Kalumba, Abwe, Schedel, Manda, Schliewen & Vreven, 2023 * '' Kneria maydelli'' Ladiges & Voelker, 1961 (Cunene kneria) * '' Kneria maxi'' Kalumba, Abwe, Schedel, Manda, Schliewen & Vreven, 2023 * '' 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 Ho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gonorhynchiformes
The Gonorynchiformes are an order of ray-finned fish that includes the important food source, the milkfish (''Chanos chanos'', family Chanidae), and a number of lesser-known types, both 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 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 are rather small, there are several fossil genera. ... [...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 Rivers 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 ''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 i ...'' 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 Fra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parakneria
''Parakneria'' is a genus of fish in the family Kneriidae, with 15 species, all of which are restricted to Africa. Species There are 15 species: * ''Parakneria abbreviata'' (Jacques Pellegrin, Pellegrin, 1931) * ''Parakneria alytogrammus'' Pacifique Kiwele Mutambala, Kiwele Mutambala, Emmanuel Abwe, Abwe, Frederic D. B. Schedel, Schedel, Auguste Chocha Manda, Manda, Ulrich K. Schliewen, Schliewen & Emmanuel J. W. M. N. Vreven, Vreven, 2022 * ''Parakneria cameronensis'' (George Albert Boulenger, Boulenger, 1909) * ''Parakneria damasi'' Max Poll, Poll, 1965 * ''Parakneria fortuita'' Michael John Penrith, M. J. Penrith, 1973 (Cubango kneria) * ''Parakneria kissi'' Poll, 1969 * ''Parakneria ladigesi'' Poll, 1967 * ''Parakneria lufirae'' Poll, 1965 * ''Parakneria malaissei'' Poll, 1969 * ''Parakneria marmorata'' (John Roxborough Norman, Norman, 1923) * ''Parakneria mossambica'' Reginald Arthur Jubb, R. A. Jubb & Graham Bell-Cross, Bell-Cross, 1974 (Gorongoza kneria) * ''Parakneria s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phractolaemidae
The hingemouth (''Phractolaemus ansorgii'') is a small freshwater fish that is found only in west central Africa, the sole member of the family Phractolaemidae 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. Its mouth can extend up to 30% of the hingemouth's head length. It has highly flexible lips, and its mouth is mainly supported by cartilage and other connective tissues. The swim bladder has two compartments, and can function as a lung, allowing the hingemouth to survive in oxygen Oxygen is a chemical element; it has chemical symbol, symbol O and atomic number 8. It is a member of the chalcogen group (periodic table), group in the periodic table, a highly reactivity (chemistry), reactive nonmetal (chemistry), non ...-poor environments. References * * * Gonorynchiformes Phractolaemidae Fish described in 1901 Taxa named by George Albert Boulenger Freshwater fish of Africa [...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. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth's land area and 6% of its total surfac .... 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] |
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. The term excludes seawater and brackish water, but 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. Water is critical to the survival of all living organisms. Many organisms can thrive on salt water, but the great majority of vascular plants and most insects, amphibians, reptiles, mammals and birds need fresh water to survive. Fresh water is the water resource that is of the most and immediate use to humans. Fresh water is not always pota ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taxa Named By Albert Günther
In biology, a taxon (back-formation from ''taxonomy''; : 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, especially in the context of rank-based (" Linnaean") nomenclature (much less so under phylogenetic nomenclature). 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 presumably set forth in prehistoric times by hunter-gatherers, as suggested by the fairly sophisticated folk taxonomies. Much later, Aristotle, and later still ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fossil
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood and DNA remnants. The totality of fossils is known as the ''fossil record''. Though the fossil record is incomplete, numerous studies have demonstrated that there is enough information available to give a good understanding of the pattern of diversification of life on Earth. In addition, the record can predict and fill gaps such as the discovery of '' Tiktaalik'' in the arctic of Canada. Paleontology includes the study of fossils: their age, method of formation, and evolutionary significance. Specimens are sometimes considered to be fossils if they are over 10,000 years old. The oldest fossils are around 3.48 billion years to 4.1 billion years old. Early edition, published online before prin ... [...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] |
