title: A new species of Labidocera (Copepoda, Calanoida, Pontellidae) collected from Okinawa, southwestern Japan, with establishment of five Indo-West Pacific species groups in the L.detruncata species complex.
abstract: Labidocerachuraumi sp. n. is described from Okinawa, southwestern Japan. The female of the new species differs from other congeners in genital compound somite with right postero-lateral and left antero-lateral processes. The male is distinguished from other congeners by the structure of the fifth leg. This new species is assigned to a newly proposed species group, the Labidoceramadurae species group, within the Labidoceradetruncata species complex. In this species complex five Indo-West Pacific species groups are recognized (cervi, detruncata, gangetica, madurae, and pavo) and defined on the basis of difference in sexual dimorphism.
authors.affiliation: Takehara Marine Science Station, Setocuhi Field Center, Graduate School of Biosphere Science, Hiroshima University, 5-8-1 Minato-machi, Takehara, Hiroshima 725-0024, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Hirabayashi
authors.affiliation: Takehara Marine Science Station, Setocuhi Field Center, Graduate School of Biosphere Science, Hiroshima University, 5-8-1 Minato-machi, Takehara, Hiroshima 725-0024, Japan.
authors.forename: Susumu
authors.initials: S
authors.lastname: Ohtsuka
keywords: Indo-West Pacific; Labidocera; Okinawa; Pontellidae; species group; taxonomy