[Histochemical study of the cysticercoids of cestodes of the genus Aploparaksis Clerc, 1903 (Hymenolepididae)].

Hystochemical methods were employed in order to study the distribution of succinic dehydrogenase, glucose-6-phosphate-dehydrogenase, alcaline, acidic phosphatases, lipids, fatty acids, glycogen and neutral. mucopolysaccharides in larvae of three species of cestodes: A. birulai, A. polystictae, A. xemae. A high concentration of succinic dehydrogenase was recorded from the tissue of the tail, scolex and neck. Glycose-6-phosphatdehydrogenase was found in great quantity only in the external parenchyma of the neck of A. polystictae. Here accumulations were observed of lipids which apparently are the products of excretion. The glycogen localization coincides with the distribution of succinis dehydrogenase. The activity of phosphatases is concentration in the structures of the tail and external membranes of cysticercoids, the acidic phosphatase being dominant. It was concluded that aerobic oxidation dominates in larvae and substances are principally transported through the tail area and excretory aperture.