MYSIDACEA FROM COASTAL WATERS OF IRIOMOTE ISLAND, RYUKYU ISLANDS, SOUTHWESTERN JAPAN, WITH DESCRIPTIONS OF 3 NEW SPECIES

Fifteen mysid species, including three new species, are reported from Iriomote Island, Ryukyu Islands, Japan. A new species, Iiella iriomote nsis, is distinguished from related species by the shapes of the rostr um and the telson cleft, the number of spines arming the frontal margi n of the labrum, and the endopod of the uropod being shorter than the exopod. Nipponomysis minuta, new species, closely resembles Nipponomys is imparis in respect to the fourth male pleopod, but is distinguished by the shorter telson and the smaller number of spines on the lateral margin of the telson and on the inner margin of the endopod of the ur opod. Anisomysis hashizunei, new species, is distinguished from relate d species by a combination of characters found in the fourth male pleo pod and the telson. Haplostylus pusillus, which has been known only fr om the Indian Ocean, is reported from the Pacific Ocean for the first time. Four species, Siriella inornata, S. anomala, Anchialina zimmeri, and Pseudanchialina pusilla are new records from Japanese waters.