[The life cycle of the trematode Pneumonoeces nanchangensis major (Plagiorchidae)--a parasite of the lungs in frogs in the Maritime Territory].

The life cycle of the trematode Pneumonoeces nanchangensis major includes three hosts: primary intermediate host (molluscs Helicorbis sujfunensis, Polypylis semiglobosa), secondary intermediate host (larvae of the dragonfly genus Lestes), and final host (frogs Rana nigrimaculata, R. semiplicata). Descriptions and measurements of cercariae and metacercariae are proposed.