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Glass Knifefish
Glass knifefishes are fishes in the family Sternopygidae in the order Gymnotiformes. Species are also known as rattail knifefishes. These fishes inhabit freshwater streams and rivers in Panama and South America. Many sternopygid species are specialized for life in the deep (more than ) swiftly moving waters of large river channels, like that of the Amazon and its major tributaries where they have been observed swimming vertically. '' Sternopygus'' species inhabit both streams and rivers. Many species are highly compressed laterally and translucent in life. These fish have villiform (brush-like) teeth on the upper and lower jaws. The snout is relatively short. The eyes are relatively large, with a diameter equal to or greater than the distance between nares. The anal fin originates at the isthmus (the strip of flesh on the ventral surface between the gill covers). The maximum length is in '' Sternopygus macrurus''. '' Eigenmannia vicentespelaea'' is the only cave-dwelling gym ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eigenmannia Virescens
The glass knifefish (''Eigenmannia virescens'') is a weakly electric freshwater fish found across South America. It is marketed as an aquarium fish. Description The appendix on the body has black lines running through the bottom of the sides, with the most intense line running on the anal fin. Like all members of its order, it is distinguished by its ability to produce electric fields. This is achieved by discharging an electric organ in the tail. Distribution This species is widely distributed in the rivers of South America. Their range extends from the Magdalena River basin in Colombia to the Rio de La Plata in Argentina, including Peru, Bolivia, Paraguay, Uruguay, Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ..., Venezuela, Guyana, and Suriname. See also ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electric Organ Discharge
An electric ray (Torpediniformes) showing location of paired electric organs in the head, and electrocytes stacked within it">Torpediniformes.html" ;"title="electric ray (Torpediniformes">electric ray (Torpediniformes) showing location of paired electric organs in the head, and electrocytes stacked within it In biology, the electric organ is an organ that an electric fish uses to create an electric field. Electric organs are derived from modified muscle or in some cases nerve tissue, and have evolved at least six times among the elasmobranchs and teleosts. These fish use their electric discharges for navigation, communication, mating, defence, and in strongly electric fish also for the incapacitation of prey. The electric organs of two strongly electric fish, the torpedo ray and the electric eel were first studied in the 1770s by John Walsh, Hugh Williamson, and John Hunter. Charles Darwin used them as an instance of convergent evolution in his 1859 ''On the Origin of Species ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fish Of South America
Fish are Aquatic animal, aquatic, craniate, gill-bearing animals that lack Limb (anatomy), limbs with Digit (anatomy), digits. Included in this definition are the living hagfish, lampreys, and Chondrichthyes, cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of living fish species are ray-finned fish, belonging to the class Actinopterygii, with around 99% of those being teleosts. The earliest organisms that can be classified as fish were soft-bodied chordates that first appeared during the Cambrian period. Although they lacked a vertebrate, true spine, they possessed notochords which allowed them to be more agile than their invertebrate counterparts. Fish would continue to evolve through the Paleozoic era, diversifying into a wide variety of forms. Many fish of the Paleozoic developed placodermi, external armor that protected them from predators. The first fish with jaws appeared in the Silurian period, after which many (such as sharks) b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhabdolichops
''Rhabdolichops'' is a genus of glass knifefishes found in Amazon, Orinoco and Maroni basins in tropical South America. They live near the bottom in main river channels, floodplains (including flooded forest like igapó) and lagoons, and are typically found in relatively deep waters. ''Rhabdolichops'' are typically overall grayish, dusky or semi-translucent resulting in whitish/pinkish color. There are two species groups: One (including most species) where the pectoral fins are relatively short and without conspicuous pigmentation, and another (including ''R. lundbergi'' and ''R. nigrimans'') where they are relatively long and all dark or dark at the tip. Depending on the exact species, they have a maximum total length of . They feed on small invertebrates such as aquatic insect larvae and zooplankton. Species There are currently 10 species in this genus: * '' Rhabdolichops caviceps'' ( Fernández-Yépez, 1968) * '' Rhabdolichops eastwardi'' Lundberg & Mago-Leccia, 1986 * ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Humboldtichthys
''Humboldtichthys'' is an extinct genus of Glass Knifefish from the Miocene Yecua Formation of Bolivia. A single species is currently recognized: ''Humboldtichthys kirschbaumi''. History and naming The earliest remains of gymnotiform electric fish were discovered in the Bolivian Yecua Formation 95 km west-northwest of Santa Cruz by petroleum geologists and easily recognized to belong to a gymnotiform fish based on several characteristic anatomical features. From material collected, Gayet & Meunier described ''Ellisella kirschbaumi'' in 1991, unaware that the genus name was already occupied by a genus of soft coral (''Ellisella''). The holotype specimen, RL 1596-4, represents an incomplete fragment of the animal, preserving the posterior margin of the skull and anterior elements of the body. An additional six fossils were also referred to the genus by Gayet & Meunier. As the name was already occupied however, the animal was given the genus name ''Humboldtichthys'' in the place of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extinct
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and recover may have been lost before this point. Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxa, where a species presumed extinct abruptly "reappears" (typically in the fossil record) after a period of apparent absence. More than 99% of all species that ever lived on Earth, amounting to over five billion species, are estimated to have died out. It is estimated that there are currently around 8.7 million species of eukaryote globally, and possibly many times more if microorganisms, like bacteria, are included. Notable extinct animal species include non-avian dinosaurs, saber-toothed cats, dodos, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eigenmannia
''Eigenmannia'' is a genus of fish in the family Sternopygidae (glass knifefishes) native to tropical and subtropical South America (south to the Río de la Plata Basin), and Panama.Peixoto, L.A.W., Dutra, G.M. & Wosiacki, W.B. (2015). The Electric Glass Knifefishes of the ''Eigenmannia trilineata'' species-group (Gymnotiformes: Sternopygidae): monophyly and description of seven new species. ''Zoological Journal of the Linnean Society, 175 (2): 384–414.'' They are typically found in slow-flowing streams, along the edge of large rivers, in deep river channels and in floodplains, and the genus also includes ''E. vicentespelaea'', the only cave-adapted knifefish. ''Eigenmannia'' are often found near submerged roots, aquatic plants and floating meadows. Depending on the exact species, they have a maximum total length of . They are nocturnal, and feed on small invertebrates such as aquatic insect larvae and zooplanktonic crustaceans. Species These are the currently recognized s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Distocyclus
''Distocyclus '' is a genus of South American glass knifefishes, with one species in the Amazon basin and another in rivers in French Guiana.Meunier, F.J., Jégu, M. & Keith, P. (2014): ''Distocyclus guchereauae'' a new species of Neotropical electric fish, (Gymnotiformes: Sternopygidae), from French Guiana. ''Cybium, 38 (3): 223-230''. Species There are currently two recognized species in this genus. A third species has sometimes been recognized, but it is better placed in the genus ''Eigenmannia'' as '' E. goajira'', although its exact taxonomic position is unresolved. * '' Distocyclus conirostris'' C. H. Eigenmann & W. R. Allen, 1942 * '' Distocyclus guchereauae'' Meunier, Jégu & Keith Keith may refer to: People and fictional characters * Keith (given name), includes a list of people and fictional characters * Keith (surname) * Keith (singer), American singer James Keefer (born 1949) * Baron Keith, a line of Scottish barons ..., 2014 References Sternopygid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archolaemus
''Archolaemus'' is a genus of South American glass knifefishes. They occur in fast-flowing sections of rivers, including rapids, in the Amazon, Tocantins, São Francisco and Araguari Araguari is a municipality in western Minas Gerais state, Brazil. It is in the northern Triângulo Mineiro region, on the Jordão River, a tributary of the Paranaíba River, at an elevation between . The municipality of Araguari has an area of , ... basins. Depending on the exact species, they reach up to about in total length. During the day they hide in rocky crevices, but during the night they are active and feed on small invertebrates such as aquatic insect larvae. Species There are currently six recognized species in this genus: References Sternopygidae Freshwater fish of South America Freshwater fish genera {{Gymnotiformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aquarium
An aquarium (plural: ''aquariums'' or ''aquaria'') is a vivarium of any size having at least one transparent side in which aquatic plants or animals are kept and displayed. Fishkeepers use aquaria to keep fish, invertebrates, amphibians, aquatic reptiles, such as turtles, and aquatic plants. The term ''aquarium'', coined by English naturalist Philip Henry Gosse, combines the Latin root , meaning 'water', with the suffix , meaning 'a place for relating to'. The aquarium principle was fully developed in 1850 by the chemist Robert Warington, who explained that plants added to water in a container would give off enough oxygen to support animals, so long as the numbers of animals did not grow too large. The aquarium craze was launched in early Victorian England by Gosse, who created and stocked the first public aquarium at the London Zoo in 1853, and published the first manual, ''The Aquarium: An Unveiling of the Wonders of the Deep Sea'' in 1854.Katherine C. Grier (2008) "Pe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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