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Karyotype and nucleolus organizer regions of Pyrrhulina cf. australis (Pisces, Characiformes,Lebiasinidae)

Claudio Oliveira^I; Artur A. Andreata^II; Lurdes F. Almeida Toledo^II; Silvio A. Toledo Filho^II

^IDepartamento de Morfologia, Instituto de Biociências, Universidade Estadual Paulista "Julio de Mesquita Filho", Campus de Botucatu, 18610 Botucatu, SP, Brasil. Send correspondence to C.O.
^IIDepartamento de Biologia, Instituto de Biociências-USP, Caixa Postal 11.461, 05499 São Paulo, SP, Brasil

ABSTRACT

The mitotic chromosomes and nucleolus organizer regions (NORs) of the Upper Paraná Basin fish Pyrrhulina cf. australis were studied. The karyotype (2n = 40; 6st + 34a) is caracterized 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.

Keywords: Karyotype; NOR; Pyrrhulina; Pisces; Characiformes.

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