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Alestion
''Alestion'' is monospecific genus of freshwater ray-finned fish belonging to the family Alestidae, the African tetras. The only species in the genus is ''Alestion rapax''. This fish is known only from the Kwilu River in the lower drainage basin of the Congo River The Congo River, formerly also known as the Zaire River, is the second-longest river in Africa, shorter only than the Nile, as well as the third-largest river in the world list of rivers by discharge, by discharge volume, following the Amazon Ri ... in the Democratic Republic of Congo. References {{Taxonbar, from=Q116188083, from2=Q116188103 Alestidae Fish described in 2019 Taxa named by Tyson R. Roberts Monotypic ray-finned fish genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alestidae
African tetras (family (biology), family Alestidae, formerly spelled Alestiidae) are a group of Characiformes, characiform fish found exclusively in Africa. This family contains about 18 genera and 119 species. Among the best known members are the Congo tetra, and Hydrocynus, African tigerfish. Although presently found only in Africa, fossil evidence suggests that during the Paleogene, they ranged as far north as southern Europe and as far east as the Arabian subcontinent. Fossil remains date back to potentially the Late Paleocene with ''Hydrocynus'' remains known from Algeria. Alestid-like teeth are also known from the Late Cretaceous (Maastrichtian) of France, and phylogenetic evidence also suggests they diverged around this time. Taxonomy Taxonomy based on Van der Laan 2017 and ''Eschmeyer's Catalog of Fishes'' (2025): * Family Alestidae Cockerell, 1910 ** Genus ''Alestes'' Johannes Peter Müller, Müller & Franz Hermann Troschel, Troschel, 1844 ** Genus ''Alestion'' Tyson R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tyson R
Tyson is an English male given name of old French origin meaning 'high-spirited', 'fire'. It is from this that a surname arose 'son of Tyson'. Surname * Alan Tyson (1926–2000), British musicologist * Barbara Tyson (born 1964), Canadian actress * Bill Tyson, Irish writer and producer * Cade Tyson (born 2003), American basketball player * Cathy Tyson (born 1965), British actress * Charles Tyson (1885–1964), English footballer *Cicely Tyson (1924–2021), American actress * Donald J. Tyson (1930–2011), American business executive and billionaire * Edward Tyson (1650–1708), English scientist and physician * Frank Tyson (1930–2015), English cricketer * Grace Tyson (1881–1941), American Vaudeville performer and actress * Ian Tyson (1933–2022), Canadian singer-songwriter * Isaac Tyson (1792–1861), American mining industrialist * Jacob Tyson (1773–1848), American politician * James Tyson (1819–1898), Australian pastoralist * J. Anthony Tyson (born 1940), American phys ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monospecific Genus
In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispecific" or "monospecific" is sometimes preferred. In botanical nomenclature, a monotypic genus is a genus in the special case where a genus and a single species are simultaneously described. Theoretical implications Monotypic taxa present several important theoretical challenges in biological classification. One key issue is known as "Gregg's Paradox": if a single species is the only member of multiple hierarchical levels (for example, being the only species in its genus, which is the only genus in its family), then each level needs a distinct definition to maintain logical structure. Otherwise, the different taxonomic ranks become effectively identical, which creates problems for organizing biological diversity in a hierarchical system. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Actinopterygii
Actinopterygii (; ), members of which are known as ray-finned fish or actinopterygians, is a class (biology), class of Osteichthyes, bony fish that comprise over 50% of living vertebrate species. They are so called because of their lightly built fish fin, fins made of webbings of skin supported by radially extended thin bony spine (zoology), spines called ''lepidotrichia'', as opposed to the bulkier, fleshy lobed fins of the sister taxon, sister clade Sarcopterygii (lobe-finned fish). Resembling folding fans, the actinopterygian fins can easily change shape and wetted area, providing superior thrust-to-weight ratios per movement compared to sarcopterygian and chondrichthyian fins. The fin rays attach directly to the proximal or basal skeletal elements, the radials, which represent the articulation (anatomy), articulation between these fins and the internal skeleton (e.g., pelvic and pectoral girdles). The vast majority of actinopterygians are teleosts. By species count, they domi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Family (biology)
Family (, : ) 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". The delineation of what constitutes a family—or whether a described family should be acknowledged—is established and decided upon by active taxonomists. There are not strict regulations for outlining or acknowledging a family, yet in the realm of plants, these classifications often rely on both the vegetative and reproductive characteristics of plant species. Taxonomists frequently hold varying perspectives on these descriptions, leading to a lack of widespread consensus within the scientific community ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kwilu River
The Kwilu River ( Portuguese: ''Rio Cuílo''; French: ''Rivière Kwilu''; Dutch: ''Kwilu Rivier'') is a major river in both Lunda Norte Province and Lunda Sul Province in Angola as well as Kwilu Province, formerly known as Bandundu province, in the Democratic Republic of the Congo (DRC) to the city of Bandundu, where it joins the Kwango River just before this stream enters the Kasai River. In the DRC the river flows past the towns of Gungu, Kikwit, Bulungu, Bagata, Rutherfordia and Bandundu. Lusanga, formerly Leverville, lies at the location where the Kwenge River joins the Kwilu, between Kikwit and Bulungu. Characteristics It is a meandering river. Near its mouth it is 950 meters wide. The bed material is sand Sand is a granular material composed of finely divided mineral particles. Sand has various compositions but is usually defined by its grain size. Sand grains are smaller than gravel and coarser than silt. Sand can also refer to a textural .... The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Congo River
The Congo River, formerly also known as the Zaire River, is the second-longest river in Africa, shorter only than the Nile, as well as the third-largest river in the world list of rivers by discharge, by discharge volume, following the Amazon River, Amazon and Ganges rivers. It is the world's deepest recorded river, with measured depths of around . The Congo–Lualaba River, Lualaba–Luvua River, Luvua–Luapula River, Luapula–Chambeshi River system has an overall length of , which makes it the world's ninth-List of rivers by length, longest river. The Chambeshi is a tributary of the Lualaba River, and ''Lualaba'' is the name of the Congo River upstream of Boyoma Falls, extending for . Measured along with the Lualaba, the main tributary, the Congo River has a total length of . It is the only major river to cross the equator twice. The Congo Basin has a total area of about , or 13% of the entire African landmass. Name The name ''Congo/Kongo'' originates from the Kingdom of Ko ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fish Described In 2019
A fish (: fish or fishes) is an aquatic, anamniotic, gill-bearing vertebrate animal with swimming fins and a hard skull, but lacking limbs with digits. Fish can be grouped into the more basal jawless fish and the more common jawed fish, the latter including all living cartilaginous and bony fish, as well as the extinct placoderms and acanthodians. In a break to the long tradition of grouping all fish into a single class (Pisces), modern phylogenetics views fish as a paraphyletic group. Most fish are cold-blooded, their body temperature varying with the surrounding water, though some large active swimmers like white shark and tuna can hold a higher core temperature. Many fish can communicate acoustically with each other, such as during courtship displays. The study of fish is known as ichthyology. The earliest fish appeared during the Cambrian as small filter feeders; they continued to evolve through the Paleozoic, diversifying into many forms. The earliest fish wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taxa Named By Tyson R
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] |
