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Denticetopsis
''Denticetopsis'' is a genus of catfishes (order Siluriformes) of the family Cetopsidae. Taxonomy Originally ''Denticetopsis'' as described by Ferraris in 1996 was restricted to two species, ''D. royeroi'' and ''D. sauli''. These two species have proved to be a subunit of a larger clade that also includes two species previously assigned to the now invalid genus ''Pseudocetopsis'' (''D. macilenta'', ''D. praecox''), together with three species described as new in 2005 (''D. epa'', ''D. iwokrama'', ''D. seducta''). Species There are currently seven recognized species in this genus: * '' Denticetopsis epa'' Vari, Ferraris & de Pinna, 2005 * '' Denticetopsis iwokrama'' Vari, Ferraris & de Pinna, 2005 * '' Denticetopsis macilenta'' ( C. H. Eigenmann, 1912) * '' Denticetopsis praecox'' (Ferraris & B. A. Brown, 1991) * '' Denticetopsis royeroi'' Ferraris, 1996 * ''Denticetopsis sauli'' Ferraris, 1996 * '' Denticetopsis seducta'' Vari, Ferraris & de Pinna, 2005 Distribution ''Dentice ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Denticetopsis Sauli
''Denticetopsis sauli'' is a species of whale catfish endemic to Venezuela, where it is only known from the Pamoni River in the Casiquiare River The Casiquiare river () is a distributary of the upper Orinoco flowing southward into the Rio Negro, in Venezuela, South America. As such, it forms a unique natural canal between the Orinoco and Amazon river systems. It is the world's largest ... basin of the upper Rio Negro system. This species grows to a length of 2.1 cm (0.8 inches). References External links * * Vari, R.P. and C.J. Ferraris Jr., 2003. Cetopsidae (Whale catfishes). p. 257-260. In R.E. Reis, S.O. Kullander and C.J. Ferraris, Jr. (eds.) Checklist of the Freshwater Fishes of South and Central America. Porto Alegre: EDIPUCRS, Brasil. (Ref. 36486) Cetopsidae Catfish of South America Endemic fauna of Venezuela Fish of Venezuela Fish described in 1996 {{siluriformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Denticetopsis Seducta
''Denticetopsis seducta'' is a species of whale catfish endemic to Brazil where it has a relatively wide, albeit scattered, distribution in the central and western portions of the Amazon basin and possibly the southwestern portions of the Orinoco The Orinoco () is one of the longest rivers in South America at . Its drainage basin, sometimes known as the Orinoquia, covers , with 76.3 percent of it in Venezuela and the remainder in Colombia. It is the fourth largest river in the wor ... River basin; it is relatively disjunct from the other species of ''Denticetopsis''. It grows to a length of 5.1 cm (2.0 inches). References * Cetopsidae Catfish of South America Freshwater fish of Brazil Endemic fauna of Brazil Fish of the Amazon basin Fish described in 2005 {{siluriformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cetopsidae
The Cetopsidae are a small family of catfishes (order Siluriformes), commonly called the whale catfishes. Taxonomy This family contains five genera divided into two subfamilies, Cetopsinae and Helogeneinae. Helogeneinae was previously a family-level group, but now it has been reclassified as a subfamily of Cetopsidae. This subfamily contains four species in the genus ''Helogenes''. The subfamily Cetopsinae contains four genera. ''Cetopsidium'' contains six species, ''Cetopsis'' contains 21 species, ''Denticetopsis'' contains seven species, and ''Paracetopsis'' contains three species; this makes a total of 37 cetopsines. The genera have been changed as recently as 2005 with the genera ''Bathycetopsis'', ''Hemicetopsis'', and ''Pseudocetopsis'' set in synonymy with ''Cetopsis'' and the description of the new genus ''Cetopsidium''. ''Cetopsidium'' is the sister group to the rest of Cetopsinae. ''Denticetopsis'' forms the next sister group to the remaining cetopsine genera. The tribe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Denticetopsis Iwokrama
''Denticetopsis iwokrama'' is a species of whale catfish endemic to Guyana where it is only known from the type locality in the Siparuni River The Siparuni River is a river in the Potaro-Siparuni Region of Guyana. It is a tributary of the Essequibo River. Tributaries of the Siparuni River include the Takutu River, Burro-Burro River, Tipuru River and Levai Creek. Archaic petroglyph ... basin. This species grows to a length of 4.3 cm (1.7 inches). References * Cetopsidae Catfish of South America Endemic fauna of Guyana Fish of Guyana Fish described in 2005 {{siluriformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Denticetopsis Royeroi
''Denticetopsis royeroi'' is a species of whale catfish endemic to Venezuela where it is only known from the holotype A holotype is a single physical example (or illustration) of an organism, known to have been used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of several ... collected in a tributary to the upper Rio Negro. This species grows to a length of 1.8 cm (0.7 inches). References * Cetopsidae Catfish of South America Endemic fauna of Venezuela Fish of Venezuela Fish described in 1996 {{siluriformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Denticetopsis Praecox
''Denticetopsis praecox'' is a species of whale catfish endemic to Venezuela where it is known from the Baria River Baria River is a river of Venezuela. It is part of the Amazon River basin. See also *List of rivers of Venezuela This is a list of rivers in Venezuela. By drainage basin This list is arranged by drainage basin, with respective tributaries inde ... of the upper Rio Negro basin. This species grows to a length of 5.3 cm (2.1 inches). References * Cetopsidae Catfish of South America Endemic fauna of Venezuela Fish of Venezuela Fish described in 1991 {{siluriformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Denticetopsis Macilenta
''Denticetopsis macilenta'' is a species of whale catfish endemic to Guyana Guyana ( or ), officially the Cooperative Republic of Guyana, is a country on the northern mainland of South America. Guyana is an indigenous word which means "Land of Many Waters". The capital city is Georgetown. Guyana is bordered by the ... where it is only known from a limited area in the Essequibo River basin. This species grows to a length of 6.7 cm (2.6 inches). References * Cetopsidae Catfish of South America Endemic fauna of Guyana Fish of Guyana Fish described in 1912 {{siluriformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Denticetopsis Epa
''Denticetopsis epa'' is a species of whale catfish endemic to Brazil where it is known from several localities in the lower portions of the Tocantins River The Tocantins River ( pt, Rio Tocantins, link=no , , Parkatêjê dialect, Parkatêjê: ''Pyti'' ɨˈti is a river in Brazil, the central fluvial artery of the country. In the Tupi language, its name means "toucan's beak" (''Tukã'' for "toucan ... basin. This species grows to a length of 4.7 cm (1.9 inches). References * Cetopsidae Catfish of South America Freshwater fish of Brazil Endemic fauna of Brazil Fish described in 2005 {{siluriformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cetopsidium
''Cetopsidium'' is a genus of catfishes (order Siluriformes) of the family Cetopsidae. Taxonomy ''Cetopsidium'' was described in 2005, its name coming from the ''Cetopsis'', the first described cetopsid genus, and ''idium'' which means diminutive, in reference to the relatively small size of ''Cetopsidium'' species. Three existing species were transferred to this genus and three new species were described. In 2009 a new species, ''Cetopsidium soniae'', was described bringing the number of species in the genus to seven. Species There are currently seven recognized species in this genus: * '' Cetopsidium ferreirai'' Vari, Ferraris & de Pinna, 2005 * '' Cetopsidium minutum'' ( C. H. Eigenmann, 1912) * '' Cetopsidium morenoi'' ( Fernández-Yépez, 1972) * '' Cetopsidium orientale'' (Vari, Ferraris & Keith, 2003) * '' Cetopsidium pemon'' Vari, Ferraris & de Pinna, 2005 * '' Cetopsidium roae'' Vari, Ferraris & de Pinna, 2005 * '' Cetopsidium soniae'' Vari & Ferraris, 2009 Distribu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Guyana
Guyana ( or ), officially the Cooperative Republic of Guyana, is a country on the northern mainland of South America. Guyana is an indigenous word which means "Land of Many Waters". The capital city is Georgetown. Guyana is bordered by the Atlantic Ocean to the north, Brazil to the south and southwest, Venezuela to the west, and Suriname to the east. With , Guyana is the third-smallest sovereign state by area in mainland South America after Uruguay and Suriname, and is the second-least populous sovereign state in South America after Suriname; it is also one of the least densely populated countries on Earth. It has a wide variety of natural habitats and very high biodiversity. The region known as "the Guianas" consists of the large shield landmass north of the Amazon River and east of the Orinoco River known as the "land of many waters". Nine indigenous tribes reside in Guyana: the Wai Wai, Macushi, Patamona, Lokono, Kalina, Wapishana, Pemon, Akawaio and Warao. Histo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dorsal Fin
A dorsal fin is a fin located on the back of most marine and freshwater vertebrates within various taxa of the animal kingdom. Many species of animals possessing dorsal fins are not particularly closely related to each other, though through convergent evolution they have independently evolved external superficial fish-like body plans adapted to their marine environments, including most numerously fish, but also mammals such as cetaceans (whales, dolphins, and porpoises), and even extinct ancient marine reptiles such as various known species of ichthyosaurs. Most species 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 large cetaceans to identify individuals in the field. The bony or cartilaginous bones that support the base of the dorsal fin in fish are called ''pterygiophores''. Functions The main purpose of the dorsal fin is to stabilize the animal against rollin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lateral Line
The lateral line, also called the lateral line organ (LLO), is a system of sensory organs found in fish, used to detect movement, vibration, and pressure gradients in the surrounding water. The sensory ability is achieved via modified epithelial cells, known as hair cells, which respond to displacement caused by motion and transduce these signals into electrical impulses via excitatory synapses. Lateral lines serve an important role in schooling behavior, predation, and orientation. Fish can use their lateral line system to follow the vortices produced by fleeing prey. Lateral lines are usually visible as faint lines of pores running lengthwise down each side, from the vicinity of the gill covers to the base of the tail. In some species, the receptive organs of the lateral line have been modified to function as electroreceptors, which are organs used to detect electrical impulses, and as such, these systems remain closely linked. Most amphibian larvae and some fully aquatic adult ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
