Revision of the Idiocnemis inornata species group

The inornata species-group, a presumed monophyletic assemblage of species of the Papuan damselfly genus Idiocnemis Selys, 1878, is revised with special regard to phylogenetically relevant morphological characters and the distribution of its species. Diagnoses of all nine previously described species are presented together with the description of two new species, I. adelbertensis, sp. nov. from northeast New Guinea and I. australis, sp. nov. from southern central New Guinea. Keys to males and females are provided. The male ligulae of all species were examined by using scanning electron microscopy. A diagnosis of the genus and a nomenclatural note on the family-group name Calicnemiinae Fraser, 1957 is included.