Анотація:
New trematoda Orthosplanchnus occulatus sp.n. from intestine of Odobaenus ros-marus divergens liliger, living in the Chukotsk Sea is described. Length of the trematoda body is 1.32 mm, maximum width — 0.66 mm. The new species differs from the other one of the given genus in the considerably less size of the body and separate organs, their interdependence, as well as in the presence of the rudimentary pigmentary eyespots, type of position of vitellarium and other host.