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    A Morphometric Approach to the Comparative Morphology of Aedeagus and Genital Plate Shapes in Two Cercopis Species (Hemiptera, Auchenorrhyncha, Cercopidae)
    (Institute of Biodiversity and Ecosystem Research - Bulgarian Academy of Sciences, 2026) Tanyeri, Rukiye; Kaya, Alaettin; Selçuk, Ahmet Yesari; Kefelioğlu, Haluk; Zeybekoğlu, Ünal
    The 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.
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    Discrimination of the three Aphrophora species: Linear morphometric and 2D-geometric morphometric approach
    (Springer, 2025) Tanyeri, Rukiye; Kaya, Alaettin; Selcuk, Ahmet Yesari; Kefelioglu, Haluk; Zeybekoglu, Unal
    In the present study, we compared three Aphrophora species using both linear and geometric morphometrics. According to the One-way ANOVA test, it was significantly indicated that the average rates of the linear measurements of the morphological characters in Aphrophora alni, Aphrophora geruzei, and Aphrophora salicina are different from each other. The jackknife rate in each species is more than 95%. Although the average measurements of the linear measurements show significant differences from each other, the minimum-maximum ranges of all characters were seen to overlap among the species. However, in geometric morphometric analyses, Procrustes ANOVA showed that whole body, head, pronotum, mesonotum size (as centroid size, CS) and shape differed significantly among the species. The species A. alni, A. salicina and A. geruzei differ from each other in canonical variates analysis and discriminant function analysis. Cross-validation rates among the three species were higher than 70%. The lowest cross-validation rate was indicated in the mesonotum. As a result of the the CS analysis, sexual differences for the complete body, significant differences were indicated for each of the species. However, in terms of shape, sexual dimorphism was only found in A. salicina for shape. In all three species, female individuals were larger in centroid size than male individuals. The geometric morphometric method is considered as an effective method for identifying new species in entomological studies. Aphrophora geruzei, identified as a new species from T & uuml;rkiye based on morphological data, was distinguished from the other two commonly seen Aphrophora species in T & uuml;rkiye by differences in the dorsal views of pronotum, mesonotum, and head, supported by geometric morphometric analysis.