Dr. Kassai Tibor - Dr. Murai Éva szerk.: Parasitologia Hungarica 8. (Budapest, 1975)

Gastrodiscoides hominis (Lewis et McConnell, 1876) (Figs. 14-19) It is a common fluke of man and pig in Asia, mainly in India. On the histology and classification of the muscular organs of this species no information in the literature has been made available. Structure of the pharynx is similar to that of G. aegyptiacus

, i. e. it is associated with pharyngeal bulb and secondary pharyngeal sacs. Length of the pharynx 300-320 p (Fig. 14), of the pharyngeal bulb 150-160 /u (Fig. 14), and of the secondary pharyngeal sacs 300-330 p (Fig. 16). The interior circular muscle layer is hardly observable (Figs. 14 and 15), the interior longitudinal layer is made of some stronger muscle fibres only (Fig. 14). The middle circular layer is well developed, it consists of small fascicles of muscle units. Anterior and posterior sphincters enterily absent. Exterior longitudinal layer is poorly developed, number of the radial muscle fibres is only a few, they are strong and fork outwards. The pharynx is of the Watsonius type and not of the Gastrodiscus one as it was suggested by NÄSMARK, The genital opening 340-350 p in diameter, genital papilla present having no sphincter papillae (Fig. 17). Radial musculature of the genital atrium is well developed and the atrium itself fairly flet. Pars musculosa short, it forms 2-3 convolutions. Pars prostatica is 100-140 fi in length with a few prostatic gland cells. Vesicula seminalis long and convoluted. Cirrus pouch absent. Type of the genital atrium belongs to the group having neither sphincter papillae nor genital sphincter. The acetabulum is terminal in position, 1600-1700 p. in diameter and 400-450 p in breadth. Radial muscle fibres are thick and are situated loosly (Figs. 18 and 19). Muscle units in the muscle series are as follows: d, e. : 24-27; d.i.: 27-30; v. e. : 13-16; v. i. : 27-30 in each. Structure of the acetabulum resembles but not identical to the type of Gastrodiscus (Figs, 11 and 19), Pores of the excretory duct and Laurer's canal open 1100-1180;u and 17 50-1880 p respectively from the posterior end of the body. Stichorchis subtriquetrus (Rud.

, 1814) (Figs. 20-24) It is the parasite of beavers in Eurasia and North America. The pharynx and the acetabulum are of the Stichorchis types (Figs. 20, 21, 23 and 24). Their structures have been found as described by NÄSMARK. The genital atrium is characterized herein the first. It is 350-370 ,u in diameter. Genital papilla present with a moderatly developed sphincter papillae (Fig, 22), Radial musculature of the genital atrium is well developed consisting of several strong fibres with ramifications outwards. Cirrus pouch present, 650-670 x 350-365 u in size, with a thick muscular wall. The internal vesicula seminalis forms convolutions, its wall thin. Pars prostatica is about 200 p in length with prostatic gland cells (Fig. 22). Type of the acetabulum resembles to the Ichikawai type (NÄSMARK, 1937). The excretory pore is at the posterior end of the body. The Laurer's canal opens at 17 50-1760 u from the posterior end. Figs. 10-13: Median sagittal sections of Gastrodiscus aegyptiacus - 10 = Genital atrium with metraterm, ductus ejaculatorius and pars prostatica; 11-12 = Dorsal and ventral parts of acetabulum; 13 = Cirrus pouch; Figs. 14-18: Median sagittal and cross sections of Gastrodiscoides hominis - 14 = Pharynx with pharyngeal bulb and secondary pharyngeal sacs; 15 = Cross section of pharynx; 16 = Cross section of secondary pharyngeal sacs; 17 = Genital atrium; 18 = Ventral half of acetabulum;