title: A new species of the genus Ishikawatrechus (Coleoptera, Trechinae) from Japan.
abstract: A new species, Ishikawatrechus bidilatatus sp. nov., is described from the northwestern part of the Ishizuchi Range, Shikoku, Japan. The structure of the everted internal sac of the aedeagus in a fully inflated condition is observed and the taxonomic significance is discussed by comparing with a related species, I. ishiharai Uéno, 1994.
authors.affiliation: Entomological Laboratory, Faculty of Agriculture, Ehime University, Tarumi, Matsuyama, 790-8566 Japan; Email: kazuki6sugaya@gmail.com.
authors.forename: Kazuki
authors.initials: K
authors.lastname: Sugaya
authors.affiliation: Entomological Laboratory, Faculty of Agriculture, Ehime University, Tarumi, Matsuyama, 790-8566 Japan; Email: unknown.
authors.forename: Junsuke
authors.initials: J
authors.lastname: Yamasako
mesh_terms: D000818:Animals; D001517:Coleoptera / Q000033:anatomy & histology* / Q000145:classification* / Q000502:physiology; D003710:Demography; D005260:Female; D007564:Japan; D008297:Male; D013045:Species Specificity