Consulta: creatorFacets:"Souza,Issakar Lima"
Registros recuperados: 2
Data/hora: 06/06/2024 00:31:01

Karyotype description of three species of Loricariidae (Siluriformes) and occurrence of the ZZ/ZW sexual system in Hemiancistrus spilomma Cardoso &amp;amp; Lucinda, 2003
Provedor de dados: 83
Autores: Oliveira,Renildo Ribeiro de; Souza,Issakar Lima; Venere,Paulo Cesar.
The neotropical freshwater systems have a high number of catfish species (Siluriformes), and many of those are denominated "cascudos" in Brazil. Cytogenetic data about three "cascudos" species fished in the rio Araguaia are described in the present study. The Pterygoplichthys joselimaianus showed 2n=52, with 28 metacentrics (M) chromosomes, 16 submetacentrics (SM) and 8 subtelocentrics/acrocentrics (ST/A) in both sexes. Hemiancistrus spinosissimus showed 2n=52, with karyotype formulae 26M+22SM+4ST, in both sexes. Hemiancistrusspilomma also showed 2n=52, but in this species a ZZ/ZW sex chromosome system (25M+21SM+6ST in females and 24M+22SM+6ST in males) was observed. The cells from H. spinosissimus and P. joselimaianus showed one chromosome pair bearing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ancistrinae; Cytogenetic; Sexual chromosomes; Araguaia.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000100010

Comparative cytogenetics in Astyanax (Characiformes: Characidae) with focus on the cytotaxonomy of the group
Provedor de dados: 83
Autores: Tenório,Renata Cristina Claudino de Oliveira; Vitorino,Carla de Andrade; Souza,Issakar Lima; Oliveira,Claudio; Venere,Paulo Cesar.
Astyanax is a diverse group of Neotropical fishes, whose different forms occupy different environments. This great diversity is also reflected on cytogenetic aspects and molecular markers, which have repeatedly been demonstrated by cytogenetic studies. In order to characterize the karyotype of species of this genus, six species were studied: Astyanax altiparanae, A.argyrimarginatus, A. elachylepis, A. xavante, and two new species provisionally called Astyanax sp. and A. aff. bimaculatus. A detailed cytogenetic study based on conventional staining with Giemsa, AgNORs, C-banding, base-specific fluorochromes, and FISH using ribosomal genes 18S and 5S was conducted, aiming to understand some of the chromosomal mechanisms associated with the high...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: C-banding; CMA3 and DAPI fluorochromes; Fish chromosome; RDNA genes; NORs.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000300553