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Jumping plant lice (  Hemiptera  :   Psylloidea  ) are considered important vectors of plant diseases and also economically important pests in agriculture and forest ecosystems. Three psyllid species    Psyllopsis   repens    Loginova, 1963,    Psyllopsis   securicola    Loginova, 1963, and    Psyllopsis   machinosus    Loginova, 1963 associated with the ash tree    Fraxinus    are morphologically very similar. So far, their distinction has been possible only by comparing their male and female genitalia. In this research, forewing shape and size characteristics, sexual dimorphism and their allometric effects, using geometric morphometric analysis, were examined for identification purposes. The results showed significant differences in wing shape and size between the species studied. Based on the results, two species P. m achinosus  and    P.   securicola    can be differentiated with the vein M1+2, as in    P.   securicola    the vein M1+2 is located between Rs and M3+4 veins, but the vein M1+2 is closer to the vein M3+4 in    P.   machinosus   ; also,    P.   repens    can be differentiated from the two species    P.   machinosus    and    P.   securicola    by vein M. Hence, the veins M1+2, M3+4, Rs and M were the most important wing characters for discrimination of the three species, especially in the field. The analysis also showed significant differences in wing shape and size between male and female of the three species, and the allometric analysis showed that significant shape differences still remain in constant size in P. m achinosus  and    P.   repens   . Geometric changes in the forewings of both sexes for the three species are illustrated.

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Identification, sexual dimorphism, and allometric effects of three psyllid species of the genus    Psyllopsis    by geometric morphometric analysis (  Hemiptera  ,   Liviidae  )