The morphology of the genitalia, especially of the male, has been used to elucidate taxonomical and evolutive questions in chrysomelids, particularly Galerucini. In this contribution, we selected genera representing the Nearctic and Neotropical subtribes of Galerucini. We provide comparative descriptions and illustrations of male genitalia of six species: Coelomera lanio (Dalman, 1823) and Dircema nigripenne (Fabricius, 1792) (Subtribe Galerucina); Exora encaustica (Germar, 1824) and Uaupesia amazona (Weise, 1921) (Subtribe Metacyclina); Paranapiacaba teinturieri (Allard, 1894) and Isotes eruptiva (Bechyné, 1955) (Subtribe Luperina). The spiculum gastrale is present in the studied species of Metacyclina and Luperina. In the median lobe, basal spurs directed ventrad do not occur only in P. teinturieri and I. eruptiva; these species present a hood-like process protecting the basal orifice. The subbasal fenestra is observed in C. lanio and U. amazona; the flagellum, an internal sac sclerite, occurs only in U. amazona. The morphology of Galerucini male genitalia is still poorly known and further studies including other genera are needed.
Aedeagus; spiculum gastrale; internal sac
