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Geometric morphometry and molecular analysis clarified the identity of Opius sp. aff. bellus (Hymenoptera, Braconidae), a fruit fly parasitoid in Brazil.

The aim of this study was to clarify the identity of specimens designated as Opius sp. aff. bellus using geometric morphometry and analysis of the ITS2 region of the ribosomal DNA (rDNA) and region D2 of the 28S rDNA. Opius bellus Gahan is a koinobiont endoparasitoid of fruit fly larvae (Diptera: Tephritidae) exclusively found in the Neotropical region, but widely distributed from Mexico to Argentina. Opius sp. aff. bellus is morphologically similar to Opius bellus but exhibits yellowish, instead of dark-brown, posterior tibiae. Twenty anatomical landmarks on the wings from these two taxa sampled from three Brazilian states were analyzed. Multivariate morphometric analysis showed a large amount of morphological similarity between the specimens, indicating they are the same species. Sequence analysis of the ITS2 showed that intrapopulation variability was similar to interpopulation variability and that the morphotypes were also highly similar. In addition, the D2 region of the 28S rDNA displayed high similarity between sequences. Therefore, based on morphometric and molecular analyses, specimens thought to be Opius sp. aff. bellus actually belong to O. bellus. 