Taxonomic revision of New Guinea diving beetles of the Exocelinadanae group, with the description of ten new species (Coleoptera, Dytiscidae, Copelatinae)

摘要

Ten new species of Exocelina Broun, 1886 from New Guinea are described: Exocelinaandakombensissp. n., Exocelinagarainasp. n., Exocelinainjiensissp. n., Exocelinakabwumensissp. n., Exocelinamarawagasp. n., Exocelinaposmanisp. n., Exocelinatekadusp. n., Exocelinavariratasp. n., Exocelinawareagasp. n., and Exocelinawoitapensissp. n. All of them together with five already described species are united into the newly defined Exocelinadanae-group (with Exocelinamiriae-subgroup), a polyphyletic complex of related species with lateral setation on the median lobe. In the light of newly available material, all previously described species of the Exocelinarivulus-group are considered to belong to a single species, Exocelinadamantiensis (Balke, 1998), which is now placed into the Exocelinadanae-group, and three new synonyms are therefore proposed: Exocelinamadangensis (Balke, 2001) syn. n., Exocelinapatepensis (Balke, 1998) syn. n., and Exocelinarivulus (Balke, 1998) syn. n. Exocelinatarmluensis (Balke, 1998) syn. n. is a junior synonym of Exocelinadanae (Balke, 1998). Redescription of Exocelinaatratus (Balfour-Browne, 1939) is provided based on its type material. An identification key to all known species of the group is provided, and important diagnostic characters are illustrated. Data on the species distribution are given, showing that whilst most species are local endemics, Exocelinadamantiensis is extremely widely distributed.