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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. S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gymnocephalus Cernua
The Eurasian ruffe (''Gymnocephalus cernua''), also known as ruffe or pope, is a freshwater fish found in temperate regions of Europe and northern Asia. It has been introduced into the Great Lakes of North America, reportedly with unfortunate results, as it is invasive and is reproducing faster than other species. Its common names are ambiguous – "ruffe" may refer to any local member of its genus ''Gymnocephalus'', which as a whole is native to Eurasia. Description The ruffe's colors and markings are similar to those of the walleye, an olive-brown to golden-brown color on its back, paler on the sides with yellowish white undersides. The ruffe can reach up to in length, but is usually around half that size. It is a very aggressive fish for its size. The ruffe also has a large, spiny dorsal fin which is likely distasteful to its predators. It also has two fins on top, the front fin has hard and sharp spines, the back fin has soft spines called rays. The most obvious featu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Balon's Ruffe
Balon's ruffe (''Gymnocephalus baloni''), also known as the Danube ruffe, is a species of freshwater ray-finned fish, a ruffe, from the family Percidae which is native to the drainages of the Danube from delta to Germany and the Dnieper from delta to Kyiv and is expected to occur in the Dniester The Dniester, ; rus, Дне́стр, links=1, Dnéstr, ˈdⁿʲestr; ro, Nistru; grc, Τύρᾱς, Tyrās, ; la, Tyrās, la, Danaster, label=none, ) ( ,) is a transboundary river in Eastern Europe. It runs first through Ukraine and th .... It inhabits areas with sand or mud substrates. It is active at night and feeds on small invertebrates. This species can reach a length of SL. It is named after Polish-Canadian ichthyologist Eugene K. Balon (1930-2013). Subscription required References Gymnocephalus Freshwater fish of Europe Fish of Europe Fish described in 1974 Taxonomy articles created by Polbot {{Percidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gymnocephalus Ambriaelacus
''Gymnocephalus ambriaelacus'' is a species of freshwater ray-finned fish, a ruffe, from the family Percidae which is endemic to Lake Ammersee, in the upper Danube basin in southern Germany. This species can reach a length is ( SL). The species is classified as Critically Endangered as its population is declining following the introduction of the ruffe (''Gymnocephalus cernua''). Some authorities suggest that this taxon may be synonymous with the Balon's ruffe Balon's ruffe (''Gymnocephalus baloni''), also known as the Danube ruffe, is a species of freshwater ray-finned fish, a ruffe, from the family Percidae which is native to the drainages of the Danube from delta to Germany and the Dnieper from delt ... (''G. baloni''). References External links * ambriaelacus Freshwater fish Fish of Europe Endemic fauna of Germany Taxa named by Matthias F. Geiger Taxa named by Ulrich K. Schliewen Fish described in 2010 {{Percidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Donets Ruffe
The Donets ruffe (''Gymnocephalus acerina'') is a species of perch native to eastern Europe where it occurs in the basins of the Black Sea and the Sea of Azov. They inhabit freshwater lakes and rivers usually over hard compacted sand. They are predominantly crepuscular and prey mostly on invertebrates (crustaceans, insect larvae, mollusks), rarely on fish. They are inactive during winter months, and usually move to deeper places until the ice melts. Spawning Spawn is the eggs and sperm released or deposited into water by aquatic animals. As a verb, ''to spawn'' refers to the process of releasing the eggs and sperm, and the act of both sexes is called spawning. Most aquatic animals, except for aquat ... occurs in small rivers with heavy currents. This species reaches a length of SL. References Gymnocephalus Freshwater fish of Europe Fish of Russia Fauna of Ukraine Donets basin Don basin Fish of the Black Sea Fish of the Sea of Azov Fish described in 1789 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Darter (fish)
Etheosomatidae is a species rich subfamily of freshwater ray-finned fish, the members of which are commonly known as the darters. The subfamily is part of the family Percidae which also includes the perches, ruffes and pikeperches. The family is endemic to North America. It consists of 3-5 different genera and well over 200 species. Characteristics Species within the Etheostomatinae are all small fish, mostly less than in length and their bodies are slightly compressed or fusiform in shape. They have two pterygiophores between the first and second dorsal fins which do not have spines and a reduced swimbladder which may be completely lacking. The name darter becomes because these fish are seen to dart around in their habitat and these fish have benthic habits. They are sexually dimorphic and most species have males with bright colours and patterning, particularly when breeding and these colours and patterns are used to attract females and allow for recognition of species as the ... [...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 more than 200 species in 11 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. Characteristics The family is characterised by having the dorsal fin split into two which are normally separated or have a narrow connection, although this is wider in the genus ''Zingel'', the front section contains the spines and the rear section contains the soft rays. The anal fin contains 1 or 2 spines, if there is a second spine it is typically weak. The pelvic fins are placed on the thorax and have a single spine and 5 soft rays. They also have skeletal synapomorphies. The maximum size attaine ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sander (fish)
''Sander'' (formerly known as ''Stizostedion'') is a genus of predatory ray-finned fish in the family Percidae, which also includes the perches, ruffes, and darters. They are also known as "pike-perch" because of their resemblance to fish in the unrelated Esocidae (pike) family. They are the only genus in the monotypic tribe Luciopercini, which is one of two tribes in the subfamily Luciopercinae, Characteristics ''Sander'' species have elongated and laterally compressed bodies and they range in total length from in the Volga pikeperch (''S. volgensis'') to in the zander (''S. lucioperca''). The species within the genus share canine-like teeth that are at their largest in the zander, and although they are not present in adult Volga pikeperches, they do possess them as juveniles. in addition, they have thin rows of teeth on their jaws, vomer, and palatines, the preopercle shows strong serrations along its edges, a continuous lateral line reaches all the way from the head to t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Juraj Holčík
Juraj is a given name used in a number of Slavic languages, including Czech, Slovak, and Croatian. Pronounced "You-rye" but with a trilled r. The English equivalent of the name is George. Notable people * Juraj Chmiel, Czech diplomat and politician * Juraj Dobrila, Croatian bishop and benefactor * Juraj Filas, Slovak composer * Juraj Habdelić, Croatian writer and lexicographer * Juraj Herz, Czechoslovakian director * Juraj Jakubisko, Slovak director * Juraj Jánošík, Slovak national hero * Juraj Križanić, Croatian Catholic missionary and first pan-Slavist * Juraj Kucka, Slovak footballer * Juraj Okoličány, Slovak ice hockey referee * Juraj Sviatko, Slovak figure skater * Josip Juraj Strossmayer, Croatian politician, Roman Catholic bishop * Juraj Slafkovský, Slovak ice hockey player * Juraj Hromkovič, Slovak Computer Scientist and Professor at ETH Zürich Derived forms * Jura: ''Czech, Slovak, Moravian, Croatian and Romanian'' * Jure: ''Croatian, Slovene'' * Jurica: ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ulrich K
Ulrich (), is a German given name, derived from Old High German ''Uodalrich'', ''Odalric''. It is composed of the elements '' uodal-'' meaning "(noble) heritage" and ''-rich'' meaning "rich, powerful". Attested from the 8th century as the name of Alamannic nobility, the name is popularly given from the high medieval period in reference to Saint Ulrich of Augsburg (canonized 993). There is also a surname Ulrich. It is most prevalent in Germany and has the highest density in SwitzerlandThis last name was found in the United States around the year 1840Most Americans with the last name were concentrated in Pennsylvania, which was home to many Pennsylvania Dutch, German immigrant communities. Nowadays in the United States, the name is distributed largely in the Pennsylvania-Ohio regio History Documents record the Old High German name ''Oadalrich'' or ''Uodalrich'' from the later 8th century in Alamannia. The related name ''Adalric'' ( Anglo-Saxon cognate '' Æthelric'') is attested ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Matthias F
Matthias is a name derived from the Greek Ματθαίος, in origin similar to Matthew. People Notable people named Matthias include the following: In religion: * Saint Matthias, chosen as an apostle in Acts 1:21–26 to replace Judas Iscariot * Matthias of Trakai (–1453), Lithuanian clergyman, bishop of Samogitia and of Vilnius * Matthias Flacius, Lutheran reformer * Matthias the Prophet, see Robert Matthews (religious impostor) Claimed to be the reincarnation of the original Matthias during the Second Great Awakening * Matthias F. Cowley, Latter-day Saint apostle In the arts: * Matthias Grünewald, highly regarded painter from the German Renaissance * Matthías Jochumsson, Icelandic poet * Matthias Lechner, German film art director * Matthias Paul (actor), German actor * Matthias Schoenaerts, Belgian actor In nobility: * Matthias Corvinus of Hungary, King of Hungary * Matthias, Holy Roman Emperor, Emperor of the Holy Roman Empire (Habsburg dynasty) In music: * Matthia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johann Friedrich Gmelin
, fields = , workplaces = University of GöttingenUniversity of Tübingen , alma_mater = University of Tübingen , doctoral_advisor = Philipp Friedrich Gmelin Ferdinand Christoph Oetinger , academic_advisors = , doctoral_students = Georg Friedrich HildebrandtFriedrich StromeyerCarl Friedrich Kielmeyer Wilhelm August Lampadius Vasily Severgin , notable_students = , known_for = Textbooks on chemistry, pharmaceutical science, mineralogy, and botany , author_abbrev_bot = J.F.Gmel. , author_abbrev_zoo = Gmelin , influences = Carl Linnaeus , influenced = , relatives = Leopold Gmelin (son) , awards = Johann Friedrich Gmelin (8 August 1748 – 1 November 1804) was a German naturalist, botanist, entomologist, herpetologist, and malacologist. Education Johann Friedrich Gmelin was born as the eldest son of Philipp Friedrich Gmelin in 1748 in Tübingen. He studied medicine under his father at University of T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maxilla
The maxilla (plural: ''maxillae'' ) in vertebrates is the upper fixed (not fixed in Neopterygii) bone of the jaw formed from the fusion of two maxillary bones. In humans, the upper jaw includes the hard palate in the front of the mouth. The two maxillary bones are fused at the intermaxillary suture, forming the anterior nasal spine. This is similar to the mandible (lower jaw), which is also a fusion of two mandibular bones at the mandibular symphysis. The mandible is the movable part of the jaw. Structure In humans, the maxilla consists of: * The body of the maxilla * Four processes ** the zygomatic process ** the frontal process of maxilla ** the alveolar process ** the palatine process * three surfaces – anterior, posterior, medial * the Infraorbital foramen * the maxillary sinus * the incisive foramen Articulations Each maxilla articulates with nine bones: * two of the cranium: the frontal and ethmoid * seven of the face: the nasal, zygomatic, lacrimal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
