EN
Light and scanning electron microscopy were used to study the redial and cercarial stages of Paucivitellosus fragilis Coil et al., 1965 recorded for the first time from the prosobranch Clypeomorus bifasciata in Kuwait Bay. The redia is cylindrical with terminal mouth and furcates at the posterior end. The tegument is densely covered with short microvilli and folded into transverse muscular bands. The mouth region is surrounded by uniciliate sensory receptors and spherical bodies. The body of the extraredial cercaria is devoid of suckers and uniformly covered with microvilli, and the tail is divisible into a proximal caudal vesicle, a tail stem and broadly lobed furcae. Upon emergence from the snail, the caudal vesicle distends over the entire cercarial body terminating in a protrusible mouth with glandular lining. Only uniciliate sensory receptors and no spines are observed on body and tail of the cercaria.