Results 61 to 70 of about 18,439 (295)

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, Dearden, Frances, Ferguson-Smith, Malcolm A, O'Brien, Patricia CM, Parise-Maltempi, Patrícia Pasquali, Rens, Willem, Trifonov, Vladimir   +6 more
core   +3 more sources

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, Efrem Jorge Gondim FERREIRA   +1 more
doaj   +1 more source

A phylogenetic analysis of Brycon and Henochilus (Characiformes, Characidae, Bryconinae) based on the mitochondrial gene 16S rRNA [PDF]

, 2008
The genus Brycon, the largest subunit of the Bryconinae, has 42 valid species distributed from southern Mexico to the La Plata River in Argentina. Henochilus is a monotypic genus, comprising a single species (H.
HILSDORF, Silva, LIMA, Flávio César Thadeo de, MATSUMOTO, Cristianne Kayoko, OLIVEIRA, Claudio   +3 more
core   +2 more sources

Mutilating predation in the Cheirodontinae Odontostilbe pequira (Characiformes: Characidae) [PDF]

Neotropical Ichthyology, 2012
We observed individuals of Odontostilbe pequira, a small characid, approaching and biting individuals of larger-bodied fishes of other species. This observation was made in two clear water headwater streams of the Cuiabá basin, Paraguay River system, located in Nobres, Mato Grosso State, Brazil, which led us to investigate the behavioral interactions ...
Diones Krinski, Eduardo Bessa, Eduardo Bessa, Lucélia Nobre Carvalho, Monise R. L. Lima   +4 more
openaire   +9 more sources

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, Enila Donald   +1 more
doaj   +1 more source

IsNematocharax(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, Nunes, Lorena Andrade, da Silva, André Teixeira, Jucá-Chagas, Ricardo, Diniz, Debora, Sampaio, Iracilda, Schneider, Horacio, Affonso, Paulo Roberto   +7 more
openaire   +5 more sources

Early ontogeny of tetra Markiana nigripinnis (Characiformes: Characidae)

Neotropical Ichthyology, 2023
Abstract The early development of Markiana nigripinnis is described by morphological characters, pigmentation, and morphometry. Larvae were obtained through semi-natural breeding, collected, fixed, and identified according to their development. Eighty individuals with standard lengths ranging from 3.1 to 24.3 mm were analyzed.
Mateus Babichi Veiga de Souza, Karina Keyla Tondato-Carvalho, Heriberto Gimênes Junior, Andréa Bialetzki   +3 more
openaire   +4 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., Ferreira, E., Jégu, Michel   +2 more
core   +1 more source

A new species of Knodus Eigenmann (Characiformes: Characidae: Stevardiinae) with comments on nuptial tubercles and gill gland in characiform fishes

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, Manoela M. F. Marinho   +1 more
openaire   +4 more sources

The brain of Brycon orbignyanus (Valenciennes, 1850) (Teleostei: Characiformes: Bryconidae): gross morphology and phylogenetic considerations

Neotropical Ichthyology
The 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, Ricardo M. C. Castro   +1 more
doaj   +1 more source