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

摘要

Labidocera churaumi >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 Labidocera madurae species group, within the Labidocera detruncata 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.