title: Cytogenetic analysis of two locariid species (Teleostei, Siluriformes) from Iguatemi River (Parana River drainage) in Brazil.
abstract: Fishes of the Loricariidae family, known as "cascudos", constitute an endemic group in Neotropical freshwaters. In this study, were cytogenetically examined two species of Loricariidae (Pterygoplichthysanisitsi Eigenmann & Kennedy, 1903 and Farlowellaamazonum (Günther, 1864) belonging to Hypostominae and Loricariinae subfamilies respectively) from Iguatemi River. Our study provide the first description regarding C-band and fluorochromic analysis in Farlowellaamazonum. In Farlowellaamazonum, diploid number was 58 chromosomes, with single Ag-NOR and heterochromatic blocks in centromeric regions of some chromosomes and large subtelomeric blocks were evidenced on the long arm of the pair 27, being this region CMA3 (+)/DAPI(-). The Pterygoplichthysanisitsi showed diploid number equal 52 chromosomes, with single Ag-NOR and heterochromatic blocks in centromeric and telomeric regions of some chromosomes and conspicuous large telomeric blocks on the long arm of the pair 10, being this region CMA3 (+)/DAPI(-). The results show that karyotype formula is nonconservative in Pterygoplichthysanisitsi and Farlowellaamazonum.
authors.affiliation: State University of Mato Grosso do Sul, BR 163-Km 20.2-CEP: 79980-000, Mundo Novo, MS, Brazil ; Grupo de Estudo em Ciências Ambientais e Educação (GEAMBE).
authors.forename: Carlos Alexandre
authors.initials: CA
authors.lastname: Fernandes
authors.affiliation: State University of Mato Grosso do Sul, BR 163-Km 20.2-CEP: 79980-000, Mundo Novo, MS, Brazil.
authors.forename: Diandra Soares
authors.initials: DS
authors.lastname: Alves
authors.affiliation: State University of Mato Grosso do Sul, BR 163-Km 20.2-CEP: 79980-000, Mundo Novo, MS, Brazil ; Grupo de Estudo em Ciências Ambientais e Educação (GEAMBE).
authors.forename: Zaira da Rosa
authors.initials: Zda R
authors.lastname: Guterres
authors.affiliation: Department of Cell Biology and Genetics, State University of Maringá, Avenida Colombo 5790, 87020-900, Maringá, PR, Brazil.
authors.forename: Isabel Cristina
authors.initials: IC
authors.lastname: Martins-Santos
keywords: Chromomicin A3; Chromosomal evolution; DAPI; Fishes; Pterygoplichthini