The shape of eggs of monogenetic trematodes is very different. 

 It varies from almost spherical, oval or egg-shaped to pyramidal and even 

 m.ore complex (Fig. 113). As a rule, the shape of the egg depends upon 

 the configuration of the inner surface of the ootype and represents, so to 

 speak, a molding in accordance with its form. The eggs of Monogenoidea 

 can be easily oriented because on the upper end there is a more or less 



p. 90 



Fig. 113. Eggs of monogenetic trematodes. A- - Diplectanum aucleatum 

 Parona and Perugia (under the egg, the end feet of two eggs, greatly 

 magnified); B--Mazocraes alosae Hermann; C- -Benedenia derzhavini 

 (Layman); D- -Acanthocotyle verrill i Goto, group of eggs (with common 

 bases!); E--Protoancyrocephalus strelkowi Bychowsky; F-- Diplozoon 

 paradoxum Nordmann; G- -Microcotyle gotoi Yannaguti, deposition (mass, 

 nobis ) of eggs; H- - Microcotyle gotoi Y amaguti (entire mass is deposited 

 at one time ! ). 



noticeable operculum. In a majority of forms the eggs have offshoots of 



the shell located on the upper, lower or both ends. The majority of re- 

 searchers group all of these sprouts under the common name, filaments 

 of the eggs. In our opinion this is completely inaccurate because the upper 

 and lower sprouts are formed differently and are not homologous to each 

 other. We designate the sprout of the upper pole of the egg as the filament 

 and the lower as the little foot. The little feet of the eggs can be very short 

 in the shape of a small thickening at the anterior end of the egg (a majority 

 of Dactylogyrus ); its location can be varied; either precisely along the axis 

 of the egg, for instance Ancylodiscoides siluri (Zandt), or it can be more or 

 less considerably displaced (for instance among Dactylogyrus wegeneri 

 Kulwiec). The short feet are for the most part straight and devoid of 



I I 



89 



