title: Nucleolus organizer regions in Physalaemus cuvievi (Anura, Leptodactylidae), with evidence of a unique case of Ag-NOR variability.
abstract: We studied ten specimens of Physalaemus cuvieri collected at different localities in Brazil using conventional staining and banding techniques. All specimens had 2n = 22. There were karyotypic variants: distinct patterns in the number and chromosome localization of Ag-NORs as well as in the corresponding secondary constrictions. Preliminary C-banding patterns obtained for specimens from two localities are also suggestive of karyotypic differentiation in P. cuvieri.
authors.affiliation: Departamento de Biologia, Instituto de Biociéncias Universidade Estadual Paulista, UNESP, Brasil.
authors.forename: A P
authors.initials: AP
authors.lastname: Silva
authors.forename: C F
authors.initials: CF
authors.lastname: Haddad
authors.forename: S
authors.initials: S
authors.lastname: Kasahara
mesh_terms: D000818:Animals; D001001:Anura / Q000235:genetics*; D001938:Brazil; D002874:Chromosome Mapping; D014644:Genetic Variation; D007621:Karyotyping; D008297:Male; D009697:Nucleolus Organizer Region / Q000235:genetics* / Q000648:ultrastructure; D016622:Silver Staining