Results 11 to 20 of about 661 (158)
Acta Amazonica, 2005 No presente trabalho é feito um levantamento dos casos de dimorfismo sexual em Siluriformes e Gymnotiformes. Este levantamento se restringe às formas Neotropicais, com ênfase mais especificamente, às da Amazônia.
Lúcia H. Rapp Py-Daniel +1 more
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The Distribution of the Fishes of the Order Ostariophysi [PDF]
Bijdragen tot de Dierkunde, 1922 The Ostariophysi are Teleostean Fishes in which the air bladder is connected with the internal ear by a chain of ossicles, the Weberian ossicles, which are modified elements of the anterior vertebrae. Although the order is a large and varied one it is undoubtedly natural, and its importance in Zoogeography arises from the fact that it is dominant in ...
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A taxonomic review of the Neotropical electric fish Rhamphichthys (Gymnotiformes: Rhamphichthyidae) [PDF]
Neotropical Ichthyology, 2023 The species diversity and taxonomy of Rhamphichthys is reviewed and seven species are considered valid: Rhamphichthys apurensis from the Orinoco and Cuyuni river basins; R. drepanium from the Amazon and Orinoco river basins; R.
Tiago P. Carvalho, James S. Albert
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On a new species of the genus Moenkhausia Eigenmann (Ostariophysi: Characidae) [PDF]
Zootaxa, 2007 A new species of the genus Moenkhausia is described from the middle portions of the Rio Tocantins and tentatively from the Rio Apure in Venezuela, Rio Orinoco drainage. It is diagnosed by the presence of a dark spot in the half proximal length of the upper caudal-fin lobe, and by the presence of a large, irregularly shaped humeral spot located above ...
Lucinda, Paulo H. F. +2 more
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New species of Curimatopsis from the río Caroni, Orinoco basin, Venezuela, with comments on C. macrolepis (Characiformes: Curimatidae) [PDF]
Neotropical Ichthyology, 2020 A new species of Curimatopsis is described from the highlands of the western Guiana Shield in the río Carapo and río Paragua, tributaries of the río Caroni in the Orinoco basin, southeastern Venezuela.
Bruno F. Melo
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Ontogeny and homology of the neural complex of otophysan Ostariophysi [PDF]
Zoological Journal of the Linnean Society, 2006 The development and homology of the neural complex in the ostariophysan subgroup Otophysi were studied, including for the first time representatives of all four major otophysan lineages. Previous hypotheses concerning the homology of the different elements of the neural complex have also been reviewed and these are discussed in light of our new ...
Hoffmann, Matthias, Britz, Ralf
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Frontiers in Neuroscience, 2015 Basic and neutral neurohypophyseal (NH) nonapeptides have evolved from vasotocin (VT) by a gene duplication at the base of the gnathostome lineage. In teleosts, VT and IT are the basic and neutral peptides, respectively.
Putul eBanerjee +2 more
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Papéis Avulsos de Zoologia, 2012 Leporinus obtusidens Valenciennes, 1837 and L. elongatus Valenciennes, 1850 are redescribed based on the type specimens, including those of their junior synonyms, and recently collected specimens.
Heraldo A. Britski +2 more
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Neotropical Ichthyology, 2021 Schizodon encompasses approximately 15 species of Neotropical headstanding fishes. Integrative taxonomy, combining molecular and morphometric analyses with traditional taxonomic methods, was used to investigate Schizodon vittatus and its potential new ...
Júlio C. Garavello +5 more
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Neotropical Ichthyology, 2021 A new species of Rhyacoglanis is described from the rapids of Jatobal, Pará State, Brazil. This species differs from the congeners by fusing hypurals 3, 4, and 5 (vs. hypural 5 free).
Oscar A. Shibatta +2 more
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