Results 11 to 20 of about 6,049 (231)
Dimorfismo sexual em Siluriformes e Gymnotiformes (Ostariophysi) da Amazônia Sexual dimorfism in Amazonian Siluriformes and Gymnotiformes (Ostariophysi) [PDF]
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
doaj +6 more sources
Morphology of the epidermis of the neotropical catfish Pimelodella lateristriga (Lichtenstein, 1823) with emphasis in club cells. [PDF]
PLoS ONE, 2012 The epidermis of Ostariophysi fish is composed of 4 main cell types: epidermal cells (or filament containing cells), mucous cells, granular cells and club cells. The morphological analysis of the epidermis of the catfish Pimelodella lateristriga revealed
Eduardo Medeiros Damasceno +4 more
doaj +1 more source
Heterogeneidade de hemoglobina nos peixes da Amazonia [PDF]
Acta Amazonica, 1978 Resumo Os padrões eletroforáticos de hemoglobinas de peixes da Amazônia foram descritos. Os peixes incluíram a pirambóia sul-americana, Lepidosiren paradoxa, quatro espécies de raias de água doce do género Potamotrygon e teleósteos sctinopterígeos de 77 ...
Unni E. H. Fyhn +5 more
doaj +1 more source
Zygoparity in Characidae - the first case of internal fertilization in the teleost cohort Otomorpha [PDF]
Neotropical Ichthyology, 2020 Most teleosts are externally fertilizing, with internal fertilization occurring as a relatively rare event. Until now, Euteleosteomorpha is the only teleost cohort known to undergo internal fertilization.
Clayton Kunio Fukakusa +2 more
doaj +1 more source
Neotropical Ichthyology, 2023 Spintherobolus papilliferus is an endangered characid endemic of the Atlantic Rainforest, known from sparse locations in the upper rio Tietê basin around the metropolitan area of São Paulo city, and from an affluent of rio Itapanhaú, a coastal stream in ...
G. Mattox +5 more
semanticscholar +1 more source
Neotropical Ichthyology, 2023 A new miniature tridentine catfish is described from the rio Purus drainage, Amazon basin, Brazil. It differs from all other tridentines in having several unique autapomorphies: conspicuous anteromedial protuberance in the snout; set of symphyseal ...
Alessio Datovo +5 more
doaj +1 more source
Neotropical Ichthyology, 2023 Psalidodon jequitinhonhae was originally proposed as a variety of Tetragonopterus rutilus, based on the analysis of 14 specimens from the Jequitinhonha River, Brazil. In 1910 it was relocated in Astyanax, as A.
Victor de Queiroz +5 more
semanticscholar +1 more source
New species of Rhyacoglanis (Siluriformes: Pseudopimelodidae) from the upper rio Tocantins basin [PDF]
Neotropical Ichthyology, 2023 A new species of Rhyacoglanis from the upper rio Tocantins basin is described based on morphological and molecular data. The new species differs from the congeners by its color pattern, caudal fin shape, hypural bones fusion pattern, pectoral-fin spine ...
Oscar Akio Shibatta +1 more
doaj +1 more source
Genetica, 2023 In the Neotropical region, one of the most diverse families of freshwater fishes is the monophyletic Serrasalmidae. Karyotypically, the family shows high diversity in chromosome numbers (2n = 54 to 64).
U. P. Jacobina +3 more
semanticscholar +1 more source
Species delimitation reveals an underestimated diversity of Andean catfishes of the family Astroblepidae (Teleostei: Siluriformes) [PDF]
Neotropical Ichthyology, 2020 Catfishes of the family Astroblepidae form a group composed by 82 valid species of the genus Astroblepus inhabiting high-gradient streams and rivers throughout tropical portions of the Andean Cordillera.
Luz E. Ochoa +9 more
doaj +2 more sources