Taxonomic notes on the ground beetles in the genus Trephionus Bates 1883 from central Honshu Japan (Coleoptera Carabidae Sphodrini Synuchina)

摘要

Trephionus Bates, 1883, a Japanese endemic genus in the subtribe Synuchina (Coleoptera, Carabidae, Sphodrini), is revised taxonomically based mainly on the shape of the endophallus, a membranous inner sac everted from the aedeagus of the male genitalia. Three known species from central Honshu, T. kinoshitai Habu, 1954; T. shibataianus Habu, 1978; and T. babai Habu, 1978, are re-defined based on this genital character, and five new species are described from the region: T. cylindriphallus Sasakawa, >sp. >n., T. niumontanus Sasakawa, >sp. >n., T. inexpectatus Sasakawa & Itô, >sp. >n., T. abiba Sasakawa & Itô, >sp. >n., and T. bifidilobatus Sasakawa & Itô, >sp. >n. The observed interspecies differences in endophallus morphology are discussed in terms of the species-level phylogeny and genus-level taxonomy of Trephionus.