Chromosome study in six Brazilian birds

The karyotypes of six species of birds, belonging to three different orders are described for the first time. Metaphases were obtained using periphera l blood lymphocyte culture. Somatic chromosomes were studied using conventi onal staining, and G- and C-banding techniques. The karyotypes were compare d to those in the literature from animals of the same family. Syrigma sibil atrix, Ardea cocoi and Tigrisoma lineatum (Ciconiiformes: Ardeidae) showed 62, 64 and 72 chromosomes, respectively. Cygnus melancoryphus and Sarkidior nis melanotos (Anseriformes: Anatidae) have 78 and 80 chromosomes, respecti vely. Nothocrax urumutum (Galliformes: Cracidae) exhibited 92 chromosomes.