[Collembola--possible intermediate hosts of Avitellina arctica (Cestoda, Anoplocephalata)].

A brief description of larvae of cestodes of A. arctica at their different developmental stages in experimentally infected collembola Onychiurus (Protaphorura) taimyrica and O. (P.) furcifer is given. Developed cysticercoids were observed 70 days after the infection. Collembola under natural conditions are supposed to be intermediate hosts of cestodes of A. arctica, parasites of reindeer.