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Cytotaxonomy of Simulium goeldii Cerqueira & Nunes De Mello and Simulium ulyssesi (Py-Daniel & Coscarón) (Diptera: Simuliidae) in Central Amazonia, Brazil

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Simulium goeldii Cerqueira & Nunes de Mello, 1967 and Simulium ulyssesi (Py-Daniel & Coscarón, 2001) share larval and pupal microhabitats in Central Amazonia and are morphologically similar, differing only in the number of gill filaments - six in S. ulyssesi and eight in S. goeldii. To test the hypothesis that S. ulyssesi is a valid species, rather than an intraspecific variant of S. goeldii, we compared the polytene chromosomes of the two morphotypes from Presidente Figueiredo, Manaus, and Careiro da Várzea (Amazonas) Counties. Our analyses indicated that the two morphotypes are distinct species, differing by four fixed inversions. Because the number of gill filaments is correlated absolutely with chromosomal banding patterns, it is a useful structural character for differentiating the two species.

Affiliations: 1: C. Ríos-Velásquez, Facultad Nacional de Salud Pública, Universidad de Antioquia, Calle 62 52-19, Of. 222, Medellín, Colombia; 2: N. Hamada, Coordenação de Pesquisas em Entomologia, Instituto Nacional de Pesquisas da Amazônia, Caixa Postal 478, 69011-970 Manaus, AM, Brazil (, Email:; 3: P. H. Adler, Department of Entomology, Clemson University, 114 Long Hall, Clemson, South Carolina 29634, USA


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