Abstract

Field-collected gynandromorph specimens of Chrysotus spectabilis (Loew) (Diptera: Dolichopodidae) from the Brazilian State of Paraná are described and illustrated, with special reference to their terminalia morphology and intersexual homology between sclerites. Based both on the position of the male clasping structures in the female gynander (arising dorsally from the acanthophorites) and the acanthophorites in the male gynander (arising from the genital capsule), it is argued that the “revised epandrial hypothesis” offers a more robust explanation for the male terminalia homology in Diptera than alternative hypotheses (namely, periandrial and hinge hypotheses). Additionally, the segmental origin of female acanthophorites is re-evaluated and assumed to be a product of fusion between tergites 9 and 10, rather than the tergite 10 only.