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Percarina
''Percarina'' is a genus of ray-finned fish in the family Percidae found in eastern Europe. They are characterised by having the first dorsal fin, having 9–11 spines and being widely separated from the second dorsal fin. Previously, they were treated as the only taxon in the Monotypy, monotypic subfamily Percarininae, but they are now placed with the perches and Gymnocephalus, ruffes in the Percinae. Species There are currently two recognised species in the genus: * ''Percarina demidoffii'' Alexander von Nordmann, Nordmann, 1840 (Common percarina) * ''Percarina maeotica'' Kuznetsov, 1888 (Azov percarina) References Percarina, Percidae Taxa named by Alexander von Nordmann Taxonomy articles created by Polbot {{Percidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Percarina Demidoffii
Common percarina (''Percarina demidoffii'') is a species of fish in the family Percidae. It is found in northwestern Black Sea basin in estuaries and coastal lakes, and in the lower reaches of the rivers that drain into that part of the Black Sea. It is a carnivorous species. Description The common percarina is distinguished from its congener ''Percarina maeotica, P. maeotica'' by having no scales on its cheek, by having nearly transparent membranes on the body and fins, the upper body is milky white in colour with no spots. It also has 8–9 round or irregular markings on the base of both dorsal fins. The dorsal fins are clearly separate in both species of ''Percarina'' and in this species the first dorsal fin contains 9–10 spines while the second dorsal fin contains 3 spines and 10–12 soft rays. The anal fin has 2 spines and 8–11 soft rays. this species has a maximum published fish measurement, standard length of . Distribution The common percarina is found in eastern Eur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Percarina
''Percarina'' is a genus of ray-finned fish in the family Percidae found in eastern Europe. They are characterised by having the first dorsal fin, having 9–11 spines and being widely separated from the second dorsal fin. Previously, they were treated as the only taxon in the Monotypy, monotypic subfamily Percarininae, but they are now placed with the perches and Gymnocephalus, ruffes in the Percinae. Species There are currently two recognised species in the genus: * ''Percarina demidoffii'' Alexander von Nordmann, Nordmann, 1840 (Common percarina) * ''Percarina maeotica'' Kuznetsov, 1888 (Azov percarina) References Percarina, Percidae Taxa named by Alexander von Nordmann Taxonomy articles created by Polbot {{Percidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Percarina Maeotica
Azov percarina (''Percarina maeotica'') is a species of ray-finned fish in the family Percidae. Description The Azov percarina is distinguished from the closely related common percarina, ''Percarina demidoffii'', by its unique characteristics of having scaled cheeks, pigmented body back and grey flanks with numerous small dark dots, which may be fused into larger spots along base of the dorsal fins. Distribution The Azov percarina is found in the eastern and northeastern parts of the Sea of Azov, in the Gulf of Taganrog and Temryuk Bay, Bolshoi Akhtanizovski Liman, Kuban River delta, rare in Don River delta. Habitat and biology The Azov percarina is foun in coastal fresh and brackish waters, the maximum salinity they are found in is 7 ppt, and in river mouths. It is a social species which is found in shoals. Smaller fish, with a standard length of feed actively on zooplankton, especially small crustaceans, Once they attain a standard length of they switch to feeding on larg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Percidae
The Percidae are a family of ray-finned fish, part of the order Perciformes, which are found in fresh and brackish waters of the Northern Hemisphere. The majority are Nearctic, but there are also Palearctic species. The family contains nearly 250 species in 12 genera. The perches and their relatives are in this family; well-known species include the walleye, sauger, ruffe, and three species of perch. However, small fish known as darters are also a part of this family. Despite the widespread and speciose nature of this family, the vast majority of its species diversity is within the darters, which are restricted to eastern North America, and the majority of which have small ranges. Excluding the darters, this family contains only 20 species. In Europe, percids were likely a more ecologically dominant group in the past than now, with the immigration of cyprinids to Europe during the Miocene causing a decline in their importance. Characteristics The family is characterised by ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alexander Von Nordmann
Alexander von Nordmann (24 May 1803 in Ruotsinsalmi, Vyborg Governorate – 25 June 1866 in Helsinki, Grand Duchy of Finland) was a Finnish biologist, who contributed to zoology, parasitology, botany and paleontology.Leikola A (2001Nordmann, Alexander von (1803 - 1866) - eläintieteen professori, todellinen valtioneuvosKansallisbiografia. SKS Biografiakeskus Biography Nordmann was a son of an officer of the Russian army at the Ruotsinsalmi fortress, Old Finland. He started academic studies at the Imperial Academy of Turku, and at that time also acted as a curator of the entomological collections. In 1827 he continued studies in Berlin with the famous parasitologist and anatomist Karl Rudolphi. His first major work was a microscopical description of tens of parasitic worms and crustaceans from the eyes and other organs of fishes and other animals, including man. These included the enigmatic monogenean '' Diplozoon paradoxum''. In 1832 he was appointed a professor (teacher) a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ray-finned Fish
Actinopterygii (; ), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish that comprise over 50% of living vertebrate species. They are so called because of their lightly built fins made of webbings of skin supported by radially extended thin bony spines called '' lepidotrichia'', as opposed to the bulkier, fleshy lobed fins of the 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 between these fins and the internal skeleton (e.g., pelvic and pectoral girdles). The vast majority of actinopterygians are teleosts. By species count, they dominate the subphylum Vertebrata, and constitute nearly 99% of the over 30,000 extant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dorsal Fin
A dorsal fin is a fin on the back of most marine and freshwater vertebrates. Dorsal fins have evolved independently several times through convergent evolution adapting to marine environments, so the fins are not all homologous. They are found in most fish, in mammals such as whales, and in extinct ancient marine reptiles such as ichthyosaurs. Most have only one dorsal fin, but some have two or three. Wildlife biologists often use the distinctive nicks and wear patterns which develop on the dorsal fins of whales to identify individuals in the field. The bones or cartilages that support the dorsal fin in fish are called pterygiophores. Functions The main purpose of the dorsal fin is usually to stabilize the animal against rolling and to assist in sudden turns. Some species have further adapted their dorsal fins to other uses. The sunfish uses the dorsal fin (and the anal fin Fins are moving appendages protruding from the body of fish that interact with water to ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monotypy
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] |
Gymnocephalus
''Gymnocephalus'' is a genus of ray-finned fishes from the family Percidae, which includes the perches, pike-perches and darters. They are from the Western Palearctic area, although one species, '' Gymnocephalus cernua'' has been accidentally introduced to the Great Lakes region where it is regarded as an invasive species. They have the common name "ruffe" and resemble the true perches in the genus ''Perca'', but are usually smaller and have a different pattern. Characteristics The species within the genus ''Gymnocephalus'' have a number of characters in common including that their dorsal fins are not completely separate, they have enlarged canals extending from the lateral line on their heads, the preorbital bone covers the maxillary bone, presence of setiform or bristle-like teeth, having very few or no vomerine and palatine teeth and the possession of three paired bones in the neck, known as extrascapulars, in their lateral line system, of which, two are simple tubes. Spe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taxa Named By Alexander Von Nordmann
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] |
