Revision of the Papuan Idiocnemis bidentata-group (Odonata: Platycnemididae)

Eight species of the Papuan genus Idiocnemis Selys, 1878, sharing common traits in ligula structure and colour pattern, referred to here as the Idiocnemis bidentata-group, are redescribed or newly described. Taxonomy and distribution are updated and one new taxon, Idiocnemis polhemi spec. nov., is described from South-East New Guinea.