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Further studies on chromosomal variability in the complex taxon Drosophila serido (Diptera, Drosophilidae)

Deborah Tosi^I; Fábio de Melo Sene^II

^IDepartamento de Biologia, Instituto de Biociências, USP, Caixa Postal 11.461, 05499 São Paulo, SP, Brasil
^IIDepartamento de Biologia, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, 141149 Ribeirão Preto SP Brasil. Send correspondence to F.M.S.

ABSTRACT

Chromosomal arrangements were analyzed in 70 isofemale lines of the Drosophila serido taxon originating from 14 different locations. Four new polymorphic arrangements were detected and described in addition to those reported in the literature. The fixed arrangement 2e⁸, heretofore considered to be restricted to D. borborema, was also detected in populations from Central-Western Brazil. Data suggesting that these populations of the Central-Western region have reached a degree of differentiation that permits us to consider them as distinct species are discussed. Some of the conclusions reached by Tosi (Masters Thesis, Instituto de Biociências, USP, 1982) were modified, especially by recognizing that the 2Y inversion reported by this investigator indeed corresponds to two inversions: inversion 2x⁷ in Northeastern Brazil, and 2j⁹ in Northern Argentina.
Even though the available data do not cover the entire area of D. serido distribution, they support the idea of mosaic differentiation from a single population that may have been isolated in "refugia" owing to the paleoclimatic cycles of the quaternary period.

Keywords: Chromosomal variability; Drosophila serido.

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