Phenotypic variation of male external genitalia of Drosophila serido species (D. repleta group, D. buzzatii cluster)

FRANCO, FERNANDO; SOTO, IGNACIO; FABIO SENE,; MAURA MANFRIN,

NEOTROPICAL ENTOMOLOGY

Sociedade Entomológica do Brasil

Año: 2008 p. 558 - 563

1519-566X

Drosophila serido Vilela & Sene is a polytypic and cactophilic species with broad geographic distribution in Brazil. The morphology of the aedeagi of eight natural populations of D. serido was analyzed. Based on features of their aedeagi, populations of D. serido were discriminated with an efficiency of nearly 75%. The analysis using the Mantel test suggests that the morphological divergence of D. serido is correlated with the geographic distance among populations. There is no single cause to explain the observed pattern; therefore, the results were discussed considering the three main hypotheses to explain the aedeagus evolution: lock and key, pleiotropy and sexual selection. Alternatively, the aedeagus variability of D. serido might be related to environmental causes, such as temperature and/or host cacti.