抄録
Ochridacyclops iriomotensis sp. nov. is described from a puddle by the Urauchi River (Iriomote I., the Ryukyu Is, southernmost Japan). This is the fourth species of the genus known in the world, and the second species from Japan. This species is similar to O. nipponensis Karaytug et al., 1996, but easily distinguishable by the longer medialmost terminal seta of the caudal ramus (2.5 times as long as the lateralmost terminal seta versus these setae being subequal).
