Abstract

A new species of gnathiid isopod, Gnathia camuripenis, from coral rubble infauna collected in Ishigaki Island, the Ryukyus, southwestern Japan, is described. The gnathiid is the 20th species of the family Gnathiidae and 8th of the genus Gnathia recorded from Japan. Males of G. camuripenis have remarkably large penes fused into a single crooked blade and mandibles with 2 inner lobes, and thus are easily separated from its congeners. Female adults and larvae considered to be the same species are also described in detail and the morphology of antennae, mouthparts and pleotelson compared to other species from the same family.

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