title: Cytogenetics of two sympatric Corydoras species (pisces, siluriformes, challichtyidae) of Southern Brazil.
abstract: Karyotypic data are presented for two sympatric Corydoras species of the Lagoa Dourada, namely, C. ehrhadti and C. paleatus, which are found in the upper Tibagi river basin (Ponta Grossa, State of Paraná, Brazil). The same diploid number and karyotypic formula were observed in both species/populations. A great similarity in the constitutive heterochromatin distribution and in the activity of nucleolar organizer regions was also found. The use of in situ hybridization with a fluorescent 18S rDNA probe allowed for the identification of the species/populations through the location of ribosomal sites.
authors.affiliation: Departamento de Biologia Estrutural, Molecular e Genética, Universidade Estadual de Ponta Grossa, CEP 84030-900, Ponta Grossa, PR, Brazil. rfartoni@uepg.br
authors.forename: R F
authors.initials: RF
authors.lastname: Artoni
authors.forename: M L
authors.initials: ML
authors.lastname: Terêncio
authors.forename: M R
authors.initials: MR
authors.lastname: Vicari
authors.forename: M C A
authors.initials: MC
authors.lastname: Matiello
authors.forename: M M
authors.initials: MM
authors.lastname: Cestari
authors.forename: L A C
authors.initials: LA
authors.lastname: Bertollo
mesh_terms: D000818:Animals; D001938:Brazil; D002397:Catfishes / Q000235:genetics*; D020732:Cytogenetic Analysis / Q000379:methods; D005260:Female; D017404:In Situ Hybridization, Fluorescence; D007621:Karyotyping; D008297:Male; D012337:RNA, Ribosomal, 18S / Q000235:genetics*; D013045:Species Specificity
chemical_list: D012337:RNA, Ribosomal, 18S