Results 51 to 60 of about 15,184 (259)
Comparative analysis of sex chromosomes in Leporinus species (Teleostei, Characiformes) using chromosome painting. [PDF]
, 2013 BACKGROUND: The Leporinus genus, belonging to the Anostomidae family, is an interesting model for studies of sex chromosome evolution in fish, particularly because of the presence of heteromorphic sex chromosomes only in some species of the genus.
da Silva, Edson Lourenço +6 more
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Morphology, molecules and the phylogeny of Characidae (Teleostei, Characiformes) [PDF]
Cladistics, 2018 AbstractThis is the most comprehensive phylogenetic analysis of the Characidae to date and the first large‐scale hypothesis of the family, combining myriad morphological data with molecular information. A total of 520 morphological characters were analysed herein, of which 98 are newly defined.
openaire +4 more sources
Is Nematocharax (Actinopterygii, Characiformes) a monotypic fish genus? [PDF]
Genome, 2016 The combination of DNA barcodes and geometric morphometrics is useful to discriminate taxonomically controversial species, providing more precise estimates of biodiversity. Therefore, our goal was to assess the genetic and morphometric diversity in Nematocharax, a controversial monotypic and sexually dimorphic genus of Neotropical fish, based on ...
Barreto, Silvia Britto +7 more
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Número de vértebras de characiformes do rio Amazonas e seu uso na identificação de larvas do grupo [PDF]
Acta Amazonica, 1988 Vertebras numbers are related to mymere numbers, consequently are a useful tool for identifying the species of fish larvae. We present here vertebrae counts and estimations of the number of myomeres for 29 species of Characiformes which have their ...
Carlos A. R. M. Araujo-Lima +1 more
doaj +1 more source
Fishes from the Río Alvarado drainage, Upper Río Magdalena Basin, Colombia [PDF]
Check List, 2020 An annotated list of the freshwater fishes of the Río Alvarado drainage, Upper Río Magdalena Basin is presented. Fishes were captured from nine localities, quarterly sampled between September 2012 and July 2013.
Juan G. Albornoz-Garzón +4 more
doaj +3 more sources
Une nouvelle espèce de Bryconexodon (Pisces, Characidae) décrite du bassin du Trombetas (Para, Brésil) [PDF]
, 1991 Une nouvelle espèce du genre #Bryconexodon$ Géry (#Pisces$, #Characidae$) est décrite du cours supérieur du Rio Trombetas (Para, Brésil). #Bryconexodon$ n. sp. est très voisine de #B.
Dos Santos, G.M. +2 more
core +1 more source
PLOS ONE, 2019 Knodus nuptialis n. sp. is described from the Rio Curuá drainage, Rio Xingu basin, Brazil. It can be diagnosed from its congeners by having dentary teeth decreasing gradually in size posteriorly, outer premaxillary teeth row with five cusps, 12-15 branched anal-fin rays and a single humeral spot.
Naércio A. Menezes +1 more
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Ontogenetic development of tetra Astyanax lacustris (Characiformes: Characidae) [PDF]
Neotropical Ichthyology, 2018 ABSTRACT Ontogenetic development of the tetra Astyanax lacustris was studied under laboratory conditions. Larvae obtained by induced reproduction were maintained individually in tissue-culture plates, at 25°C. Daily observations and morphometric measurements were performed.
Diego J. Stevanato, Antonio Ostrensky
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Neotropical IchthyologyThe brain of Brycon orbignyanus is described as a model for future studies of the gross morphology of the central nervous system in Characiformes. The study of brain gross morphology of 48 distinct taxa of Characiformes, one of Cypriniformes, two of ...
Thiago N. A. Pereira +1 more
doaj +1 more source
Fish fauna from Río Pilcomayo National Park and Ramsar Site and its surroundings, Formosa, Argentina [PDF]
, 2014 The first list of fish species from the Río Pilcomayo National Park and Ramsar Site (RPNP), located in the WetChaco plains of Northern Argentina is presented here.
Baigún, Claudio Rafael M. +5 more
core +4 more sources