[Some results of the study of trematode fauna of the freshwater mollusc Melanopsis praemorsa (L.) from Azerbaijan water bodies. Report 3. New species of stylet cercaria].

The structure (illustrated by pictures) and differential diagnoses of 3 new closely related forms of stylet cercaria (Cercaria agstaphensis 8, Cercaria agstaphensis 21 and Cercaria agstaphensis 16) are given. Special attention was paid to the armament of the glandular apparatus, to the excretory and digestive systems, and to other taxonomically important structural peculiarities.