Data/hora: 06/06/2024 03:37:50

Provedor de dados: | 83
País: | Brazil
Título: | Karyotype description of three species of Loricariidae (Siluriformes) and occurrence of the ZZ/ZW sexual system in Hemiancistrus spilomma Cardoso &amp;amp; Lucinda, 2003
Autores: | Oliveira,Renildo Ribeiro de; Souza,Issakar Lima; Venere,Paulo Cesar.
Data: | 2006-03-01
Ano: | 2006
Palavras-chave: | Ancistrinae; Cytogenetic; Sexual chromosomes; Araguaia.
Resumo: | 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 Ag-NORs, while in the H. spilomma three chromosome pairs bearing Ag-NORs were detected. The data showed in this work reveal particular chromosomal characteristics, important for a good recognition of both Hemincistrus species, and also show the importance of the insertion of cytogenetic data on taxonomic phylogenetic studies.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000100010
Editor: | Sociedade Brasileira de Ictiologia
Relação: | 10.1590/S1679-62252006000100010
Formato: | text/html
Fonte: | Neotropical Ichthyology  v.4 n.1 2006
Fonte: | info:eu-repo/semantics/openAccess