[The surface of cysts and excysted metacercariae of Opisthorchis felineus studied by scanning electron microscopy].

The structure of cysts of metacercariae of O. felineus has been analyzed. The cyst structure appears to have folds, pores and spherical formations providing for larval homeostasis. On the tegument of metacercariae thorns are arranged in staggered order. They represent 3 to 6 finger-shaped structures. The thorns and tegument excreta are secreted. On the surface of the parasite there are single and group sensory cupola-shaped and conoid papillae which make a chain around the mouth sucker. Polymorphism is revealed in the opisthorchis metacercariae structure.