Abstract:
It is known that the class Trematoda includes exclusively parasitic
forms of flatworms. In this regard, they have formed a variety of
morphological and functional adaptations to a parasitic lifestyle. One of them
is the colossal fecundity, which provides the possibility of rapid and wide
settlement and detection of hosts. Therefore, the study of the sexual
reproduction of helminths is the central problem of parasitology. The study
of the functional morphology of the reproductive system of trematodes in
general and its parts, is of particular interest in solving such an important
problem in theoretical and practical terms as the directed regulation of the
fecundity of end parasites. The present article provides information on the
functional morphology of the vitelline cells of the Azygia lucii trematode,
describing in detail the micromorphology and ultrastructure of the vitelline
cells and the development stages of vitelline cells in the course of
vitellogenesis. As a result, the knowledge gained on the peculiarities of the
structure and maturation of Azygia lucii vitelline s will significantly supplement
the knowledge about the peculiarities of the structure of the female reproductive
system of Strigeidae trematodes and the fecundity of end parasites.
