Oliveira, C.Andreata, A. A.Toledo, LFAToledo, S. A.2014-05-202014-05-201991-09-01Revista Brasileira de Genetica. Ribeirao Pret: Soc Brasil Genetica, v. 14, n. 3, p. 685-690, 1991.0100-8455http://hdl.handle.net/11449/37642The mitotic chromosomes and nucleolus organizer regions (NORs) of the Upper Parana Basin fish Pyrrhulina cf. australis were studied. The karyotype (2n = 40; 6st + 34a) is characterized by the presence of four chromosome pairs with NORs, one of them with NORs in both terminal regions. Comparison of this karyotype with those of other Characiformes, revealed a strong similarity to the family Erythrinidae.685-690engArtigoWOS:A1991GJ11200009Acesso abertoWOSA1991GJ11200009.pdf