Abstract
Cathucotyle arabiansis, a new species, is described from the gills of fish Scomberomorus guttatus of Karachi coast, Pakistan. The present specimens are compared with all existing species of the genus , which are different in several diagnostic characteristics, such as, aseptate oral sucker, single rounded vagina, horseshoe-shaped ovary, clamps consisting of marginal sclerites, 3 pairs of connecting and median sclerites.
