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Karyotype evolution in curimatidae (Teleostei, Characiformes) of the amazon region. I. studies on the genera Curimata, Psectrogaster, Steindachnerina and Curimatella

Eliana Feldberg^I; Jorge Ivan Rebelo Porto^I; Luiz Antonio Carlos Bertollo^II

^ICoordenação de Pesquisa em Biologia Aquática, Instituto Nacional de Pesquisas da Amazônia (INPA), 69083 Manaus, AM, Brasil. Send. correspondence to E.E.
^IIDepartamento de Ciencias Biológicas, Universidade Federal de São Carlos, 13560 São Carlos, SP, Brasil

ABSTRACT

Cytogenetic studies were carried out on nine species of fish belonging to four genera of the family Curimatidae (Curimata ocellata, C. vittata, C. kneri, C. cyprinoides, C. inornata, Psectrogaster rutiloides, Steindachnerina leuciscus, Curimatella album, and Curimatella meyeri). All species were collected from the central Amazon basin. C. ocellata presented 2n-56, whereas all other species presented 2n-54 chromosomes. With respect to the NORs patterns, only one nucicolar chromosome pair was detected for each of the species, except for C. vittata, which presented only one silver-stained chromosome. There was obvious interspecific diversity with respect to NORs localization and position in the karyotypc, suggesting the occurrence of rearrangements (translocations and/or transpositions).

Keywords: karyotype evolution; Curimatidae; Characiformes; Curimata; Psectrogaster; Steindachnerina; Curimatella.

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