Intermediate host of the trematode Quinqueserialis quinqueserialis (Trematoda, Notocotylidae) in the USSR and the morphology of its parthenitae and larvae

A high infection rate of muskrat with the trematode Q. quinqueserialis was recorded in Pribaikalje. Its intermediate host is the mollusc Gyraulus (Anisus) stroemi. Morphology and biology of parthenites and larval phases of the development are studied and characters of the biology of this trematode are found out.