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Karyotypic variability in Hoplerythrinus unitaeniatus (Pisces, Characiformes, Erythrinidae). II. Occurrence of natural tripoidy

Lucia Giuliano-Caetano^I; Luiz Antonio Carlos Bertollo^II

^IDepartamento de Biologia Geral, Universidade Estadual de Londrina, 86051 Londrina, PR, Brasil. Send correspondence to L.G.-C.
^IIDepartamento de Ciências Biológicas, Universidade Federal de São Carlos, 13560 São Carlos, SP, Brasil

ABSTRACT

Holerythrinus unitaeniatus fish collected from the Negro river, Manaus region (AM) were characterized by a diploid number equal to 48 chromosomes. A female specimen, however, exhibited 72 chromosomes, with a karyotype consisting of 23 M-SM chromosome triplets and one ST-A chromosome triplet, thus representing a case of natural triploidy. In this triploid, the NORs were detected in triplicate and were found to be active in only one of the different types of chromosomes involved in nucleolar organization in this species.

Keywords: Karyotypic; Hoplerythrinus unitaeniatus; Pisces; triploidy.

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