Tanyeri, RukiyeKaya, AlaettinSelçuk, Ahmet YesariKefelioğlu, HalukZeybekoğlu, Ünal2026-04-252026-04-2520260324-0770https://doi.org/10.71424/azb78.1.002879https://hdl.handle.net/11486/8115The species of the genus Cercopis Fabricius, 1775 are morphologically similar, and there are difficulties in identifying them due to the inadequacy of diagnostic keys and the colour and pattern variations. For this reason, it can be challenging to distinguish the species without carefully dissecting and examining the male genitalia. In the present study, we compared the morphology of the aedeagus and the genital plates of two Cercopis species using geometric morphometrics (GM). We investigated the size and shape of the aedeagus and genital plates of C. intermedia Kirschbaum, 1868 and C. vulnerata Rossi, 1807 to evaluate whether these structures could serve as useful tools for species differentiation. The centroid size of aedeagus was significantly different between species (p = 0.01), but genital plate size was not (p = 0.8). Both aedeagus and genital plate shape were significantly different between species, based on Procrustes ANOVA and Pillai trace (MANOVA) p value. The results of discriminant function analysis of aedeagus and genital plate indicate that species are clearly discriminated. The parametric p value of T2 and permutation p value of T2 and procrustes distances show that the differences were significant. © 2026, Institute of Biodiversity and Ecosystem Research - Bulgarian Academy of Sciences. All rights reserved.eninfo:eu-repo/semantics/openAccessCercopisgeometric morphometryShape variationTürkiyeArticle7819710410.71424/azb78.1.0028792-s2.0-105033649494Q4