[Life cycle of Psilotrema simillimum (Mühling, 1898) (Trematoda: Psilostomidae)].

Psilotrema simillimum has one intermediate host, the mollusk Bithynia leachi. Cercariae emerging from the mollusk encyst in the environment. Adolescariae become infectious in 3-7 days. In the definitive host trematodes become mature on the 9th day. The development of miracidium in an egg finishes in 19 days at 20-24C. Egg, miracidium, redia, cercariae, adolescariae and marites obtained in the experiment are described.