Results 51 to 60 of about 6,389 (219)
PLoS ONE, 2013 Fishes of the order Characiformes are a diverse and economically important teleost clade whose extant members are found exclusively in African and Neotropical freshwaters. Although their transatlantic distribution has been primarily attributed to the Early Cretaceous fragmentation of western Gondwana, vicariance has not been tested with temporal ...
Jairo Arroyave +2 more
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Chromosomal characterization of three species of Serrasalmini (Serrasalmidae: Characiformes)
Genetics and Molecular Biology, 2023 The tribe Serrasalmini is a diverse group with paraphyletic genera and taxonomic uncertainties. Several studies have been carried out in this group of fish in order to understand this problem, including the cytogenetic approach. In this study, three species of a clade of Serrasalmini were characterized cytogenetically - Pristobrycon striolatus ...
Alan Gomes dos Santos +4 more
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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
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.
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The efficiency of spermatogenesis and the support capacity of Sertoli cells in Characiformes [PDF]
Theriogenology, 2017 This stereological analysis of the types of germ cells and the number of Sertoli cells per cyst in Astyanax altiparanae testes during spermatogenesis is the first such report in Characiformes. Testes of 25 male A. altiparanae were examined. Based on the number of spermatogonia B per cyst (469.2 ± 9.92), we estimated that spermatogonia undergo at least ...
Rodrigues, Maira da Silva +4 more
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Ocorrência de ovos e larvas de Characiformes migradores no Rio Negro, Amazonas, Brasil [PDF]
Acta Amazonica, 2002 A ocorrência de ovos e larvas de sete espécies de Characiformes migradores em estágio de larval vitelino, pré-flexão e flexão, é descrita pela primeira vez para o rio Negro. É discutida a possibilidade de desova dessas espécies neste sistema pela fase de
Edinbergh Caldas de OLIVEIRA +1 more
doaj +1 more source
The Anatomical Record, EarlyView.Abstract This study investigated the physiological and morphological adaptations of the liver of the carnivorous fish Pygocentrus nattereri (piranha) in response to seasonal variations (dry and rainy seasons) in the Brazilian Pantanal. The objective was to describe how the liver, a central organ in metabolic regulation, responds to environmental ...
Maria Eduarda Corona Garcia +9 more
wiley +1 more source
The Anatomical Record, EarlyView.Abstract Arhinolemur scalabrinii† Ameghino, 1898 was originally described as a strepsirrhine primate (Mammalia) but has been recognized as an anostomid fish since 2012. It remains the only extinct anostomid species known from complete cranial material.
Karen M. Panzeri +8 more
wiley +1 more source
Systematics of the Neotropical characiform genus Potamorhina (Pisces, Characiformes)
Smithsonian Contributions to Zoology, 1984 NMNH ; NH-Vertebrate Zoology ; SISP ; Peer ...
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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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