The Aedeagus and spermatheca structures of Chrysomela collaris Linnaeus, 1758, Chrysomela populi Linnaeus, 1758, Chrysomela saliceti (Weise, 1884), Chrysomela tremula Fabricius, 1787 and Chrysomela vigintipunctata (Scopoli, 1763) species, widespread in Turkey, have been studied. Relationships between species by observing the structure of aedeagus and spermatheca which allow their accuracy species-level identification are detaily included in the study. A dichotomous key for the species of the genus Chrysomela Linnaeus,1758 present in Turkey, the first one for the country, is also provided (including genitals photos). Accordingly to what was observed in this study, aedeagus and spermatheca related characters can be used to easily distinglush the species of the genus Chrysomela present in Turkey.