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Cytogenetical studies on Hoplias malabaricus, intensive in the last few years, have determined that it does not represent only 1 species, as it is classified, but a complex of species with 7 cytotypes , some of them living in a sympatric condition with no hybrids. In this study, for the first time, 3 cytotypes were found in sympatry and sintopy in the Upper Parana River floodplain. Cyytotaxonomy and geographical aspects are discussed.

Occurrence of Three Sympatric Cytotypes of Hoplias malabaricus (Pisces,Erythrinidae) in the Upper Parana River Foodplain (Brazil)