“…This effect has been seen in the number of sternopleural and outer orbital bristles of Drosophila melanogaster Meigen, 1830 (Woods et al , 1999), and in the number of frontal bristles and postocular setae (R–L sides) of Anastrepha fraterculus complex Wiedemann, 1830 (Souza et al , 2007). According to the results obtained by our team (Moratore, 2009; Peruzin, 2009) in a Culex quinquefasciatus Say, 1823 population also collected in PET, in which wing shape asymmetry was observed (bilateral asymmetry), it is possible that artificial environmental factors probably contributed to FA expression. This asymmetry may also be endogenous due an ‘epigenetic control’ in gene expression of RP development, interfering in gene effectiveness.…”