title: Cytogenetic analysis of four central Amazonian species of Colostethus (Anura - Dendrobatidae) with a diploid complement of 22 chromosomes.
abstract: Colostethus marchesianus from the type locality and three related species had 2n = 22 chromosomes, which differed from most other Colostethus species that have 2n = 24 chromosomes. The species analyzed were morphologically similar and showed a conservative karyotype, although they could be distinguished from each other by their C-banding pattern. Additional NOR sites, heteromorphism in NOR size and heterochromatin, and an additional rDNA site detected by FISH, were observed. These data suggest that chromosomal rearrangements and hetrochromatin-related events may have contributed to the karyotype differentiation of these Colostethus.
authors.affiliation: Departamento de Biologia Celular, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, SP, Brasil.
authors.forename: Ana Cristina P
authors.initials: AC
authors.lastname: Veiga-Menoncello
authors.forename: Albertina P
authors.initials: AP
authors.lastname: Lima
authors.forename: Shirlei M
authors.initials: SM
authors.lastname: Recco-Pimentel
mesh_terms: D000818:Animals; D001001:Anura / Q000235:genetics*; D002871:Chromosome Banding; D002875:Chromosomes; D004171:Diploidy; D005260:Female; D007621:Karyotyping; D008297:Male; D013045:Species Specificity