Functional Role of Vitelline Glands and Mehlis Gland in the Process of Resistant Egg Shell Formation in Trematodes

The study of the functional morphology reproductive system trematodes, as well its individual parts, provides an opportunity to solve important problem that plays a huge role in theoretical and practical terms directed regulation fecundity endoparasites. article is devoted vitelline glands Mehlis process formation resistant egg shells on example Parastrigea robusta trematode. mechanisms are revealed basis histomorphological ultrastructural studies, underlying provision trematode eggshell processes each mentioned departments. sequence appearance maturation shell material follicles during vitellogenesis has been determined. gland substantiated electron microscopy methods their morphological analysis micromorphological data. obtained data reveals information structural unity eggshell, glands, providing "large number eggs". According results histological microscopic studies trematode, general scheme was formed. As result, knowledge peculiarities structure will significantly complement features female trematodes fertility work can be used for further research selection anthelmintic agents affect which lead level