Description of 23 new species of the Exocelina ekari-group from New Guinea, with a key to all representatives of the species group (Coleoptera, Dytiscidae, Copelatinae)

Abstract. Twenty three new species of Exocelina Broun, 1886 from New Guinea are described herein: Exocelina bewaniensis sp. n., Exocelina bismarckensis sp. n., Exocelina craterensis sp. n., Exocelina gorokaensis sp. n., Exocelina herowana sp. n., Exocelina jimiensis sp. n., Exocelina kisli sp. n., Exocelina ksionseki sp. n., Exocelina lembena sp. n., Exocelina mantembu sp. n., Exocelina michaelensis sp. n., Exocelina pinocchio sp. n., Exocelina pseudoastrophallus sp. n., Exocelina pseudobifida sp. n., Exocelina pseudoedeltraudae sp. n., Exocelina pseudoeme sp. n., Exocelina sandaunensis sp. n., Exocelina simbaiarea sp. n., Exocelina skalei sp. n., Exocelina tabubilensis sp. n., Exocelina tariensis sp. n., Exocelina vovai sp. n., and Exocelina wannangensis sp. n. All of them have been found to belong to the Exocelina ekari-group. An identification key to all known species of the group is provided, and important diagnostic characters (habitus, color, male antennae, protarsomeres 4–5, median lobes, and parameres) are illustrated. Data on the distribution of the new species and some already described species are given.