Abstract
Cytological evidence indicates that the Brazilian species, Drosophila serido and D. borborema are members of the D. buzzatll cluster of the D. mulleri complex, having arisen from the Fb ancestor, whose chromosomal sequence was Xabc;2abd2 e2s6;3b. Each of these two species, together with D. buzzatll and the southern populations of D. serido, appear to be homozygous for its own unique inversion and its own unique chromosomal polymorphism. D. borborema is polymorphic for four inversions; Brazillan D. serido, for four inversions; southern D. serido for 10 inversions; and D. buzzatil, for 13 inversions. These numbers are relatively high for members of the cactus-inhabiting D. mulleri complex.
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