Abstract
Gnathiid larvae were collected as ectoparasites on elasmobranchs caught in fisheries off Okinawa Island, Ryukyu Archipelago, southwestern Japan. The larvae were reared in a laboratory aquarium; some metamorphosed into male and female adults of Gnathia nubila n. sp. and Gnathia grandilaris Coetzee, Smit, Grutter & Davies, 2008. Males of G. nubila n. sp. were easily distinguished from all other species by the bifit and dentate mediofrontal process of the frontal border and by a narrow pleotelson. Gnathia grandilaris was originally recorded from the Great Barrier Reef (GBR), Australia, and here we report a second find of this species from the Ryukyus. Since the first description did not include female adult of G. grandilaris, we provide the morphology of female.References
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