Populations of Drosophila serido from various geographic origins
were characterized using four markers: morphology of male genitals, inversions
in polytene chromosomes, morphology and heterochromatin of metaphase
chromosomes, and reproductive isolation. In all cases the species shows
itself to be polytypic, but the geographic distribution patterns vary according
to the marker utilized. The validity of the use of these parameters for taxonomic
purposes and/or for understanding the mechanisms involved in the
differentiation among populations is discussed
