A new species of Syrticola Willems & Claeys, 1982 (Harpacticoida: Cylindropsyllidae) is described from Okinawa, Japan. Morphological notes on the type species S. flandricus Willems & Claeys, 1982 and a key to the species are given. The inadequately described S. trispinosus A. Scott, 1896 is ranked as species inquirenda. The diagnosis of the genus is amended and its position in the Cylindropsyllidae re-assessed. Both sexes of S. intermedius sp. nov. were found to be infested by early parthenogenetic female stages of an as yet undescribed genus of Tantulocarida
