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Karyotypic diversity and distribution in Hoplias malabaricus (Pisces, Erythrinidae) : Cytotypes with 2n = 40 chromosomes

 

 

Luiz Antonio Carlos Bertollo; Orlando Moreira-Filho; Michel Soares Fontes

Departamento de Genética e Evolução, Universidade Federal de São Carlos, Caixa Postal 676, 13565-905 São Carlos, SP, Brasil. Send correspondence to L.A.C.B.

 

 

ABSTRACT

Data about karyotype diversification and its distribution among populations of Hoplias malabaricus are presented. Two cytotypes were denoted as types A and B. Although both had 2n = 40 meta-submetacentric chromosomes, these two cytotypes presented some characteristics that allow to differentiate them as distinct entities, the most evident being the relative size of the first chromosome pair. In cytotype A this chromosome was larger than the following ones in the karyotype, a fact not observed in cytotype B. This difference is not - due to additional heterochromatic regions, as shown by the C-banded chromosomes. The geographic distribution of cytotype B appears to be larger than that of cytotype A, the former being more dispersed among Brazilian hydrographic basins, reaching Northeast Argentina. However, cytotype A was also found in other countries, as is the case of the Paramaribo population, in Surinam. This study supports the hypothesis that H. malabaricus is a species complex.

Keywords: Pisces; karyotype; Hoplias.

 

 

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