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Sternarchogiton
''Sternarchogiton'' is a genus of weakly electric knifefish in the family Apteronotidae, with four known species, all living in the main channel of large rivers in the Amazon and Orinoco basins in South America. They have a blunt snout and depending on the exact species reach up to in total length. The adult males of ''S. nattereri'' have teeth on the outside of the jaw, believed to be used in fights with other males, and it was formerly placed in its own genus because of this unique feature. ''Sternarchogiton'' are distinguished from other apteronotid genera by details of the skull and the broad descending blades of the pterygiophores in the anal fin. They are related to the genera '' Adontosternarchus'' and ''Porotergus''. Species There are four recognized species: * '' Sternarchogiton labiatus'' de Santana & Crampton, 2007 * '' Sternarchogiton nattereri'' (Steindachner Franz Steindachner (11 November 1834 in Vienna – 10 December 1919 in Vienna) was an Austrian zoolo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sternarchogiton Zuanoni
''Sternarchogiton'' is a genus of weakly electric knifefish in the family Apteronotidae, with four known species, all living in the main channel of large rivers in the Amazon and Orinoco basins in South America. They have a blunt snout and depending on the exact species reach up to in total length. The adult males of ''S. nattereri'' have teeth on the outside of the jaw, believed to be used in fights with other males, and it was formerly placed in its own genus because of this unique feature. ''Sternarchogiton'' are distinguished from other apteronotid genera by details of the skull and the broad descending blades of the pterygiophores in the anal fin. They are related to the genera '' Adontosternarchus'' and ''Porotergus''. Species There are four recognized species: * '' Sternarchogiton labiatus'' de Santana & Crampton, 2007 * '' Sternarchogiton nattereri'' (Steindachner Franz Steindachner (11 November 1834 in Vienna – 10 December 1919 in Vienna) was an Austrian zoolo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sternarchogiton Porcinum
''Sternarchogiton porcinum'' is a species of weakly electric knifefish in the family Apteronotidae. It is native to deep river channels in the Río Huallaga, Río Napo, and Río Amazonas in Peru, and in the Río Orinoco in Venezuela. Many specimens once identified as ''S. porcinum'' from the Brazilian Amazon Basin and the Venezuelan Orinoco are now known to be a different species, '' S. preto''. ''S. porcium'' is distinguishable from all other ''Sternarchogiton'' species by the straight dorsal profile of its laterally compressed head. The eyes are small and covered by a thin membrane. The mouth is terminal, with the upper jaw longer than the lower. There are no teeth on the premaxilla and one row of 11 tiny conical teeth on the dentary. Both upper and lower pharyngeal tooth plates are present, bearing 8 and 10 teeth respectively. There is no sexual dimorphism in cranial morphology. The body is compressed and knife-shaped, with 4-6 rows of scales above the lateral line. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sternarchogiton Nattereri
''Sternarchogiton nattereri'' is a species of weakly electric knifefish in the family Apteronotidae. It is native to the Amazon River system and feeds on sponges. Unlike other members of the genus '' Sternarchogiton'', there is pronounced sexual dimorphism in ''S. nattereri'', with reproductively mature males developing strong external teeth on tips of their jaws. These males are so different from the females and juveniles that they were thought to be a different genus and species, the "tooth-lip knifefish" ''Oedemognathus exodon'', for over 40 years. Distribution and habitat ''S. nattereri'' is restricted to large river channels in the lowlands of the Amazon basin. Its habitat ranges from high-conductivity, sediment-rich whitewater rivers such as the Rio Solimões, to low-conductivity, sediment-poor blackwaters such as the Rio Negro. It is one of the most common gymnotiforms in Rio Solimões. Description ''S. nattereri'' has a laterally compressed, knife-shaped body. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sternarchogiton Labiatus
''Sternarchogiton labiatus'' is a species of weakly electric knifefish in the family Apteronotidae. Its species name ''labiatus'' comes from the Latin ''labium'', meaning "lip", referring to a distinctive three-lobed structure on its lower lips. ''S. labiatus'' is only known from the Tefé River, at a depth of , and from the lower Rio Negro, in the Amazon River basin. They have been captured from both whitewater and blackwater habitats. ''S. labiatus'' has a laterally compressed, knife-shaped body with a nearly straight dorsal profile and a long anal fin. The head is laterally compressed, with a curved dorsal profile and small eyes that are covered by a thin membrane. The mouth is terminal, with a three-lobed rigid structure consisting of a pair of smooth, hard, bulbous swellings along the lower lip and a medial spur that projects down and forward. The lower jaw is longer than deep, bearing two rows of conical teeth numbering 17 plus 4 replacements each. There are upper an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |