SPOROZOA, GREGARINIDA 387 



Genus Choanocystoides Cognetti. Trophozoites solitary, 

 rounded or cup-shaped; anterior end with a mobile sucker, 

 bordered by cytoplasmic filaments. One species. 



C. costaricensis C. (Fig. 176, o). In seminal vesicles of Phere- 

 tima heterochaeta (Costa Rica); trophozoites 40-45juin diameter; 

 nucleus ovoid, large, 12^t in diameter. 



Genus Beccaricystis Cognetti. Mature trophozoites elongate, 

 cylindrical, with a sucker-like depression at anterior end; nucleus 

 at its bottom. One species. 



B. loriai C. (Fig. 177, a). In seminal vesicles of Pheretima 

 sermowaiana; trophozoites cylindrical, with w^art-like growths, 

 myonemes run lengthwise with radially arranged transverse 

 fibrils; about 100^1 long. 



Genus Albertisella Cognetti. Mature trophozoites cup-shaped, 

 with anterior sucker with a smooth wall; nucleus at its bottom. 

 One species. 



A. crater C. In seminal vesicles of Pheretima sermowaiana. 



Family 6 Schaudinnellidae Poche 



Parasitic in the digestive system of oligochaetes; spores spheri- 

 cal; trophozoites do not encyst; male trophozoites producing 

 microgametes and female, macrogametes ; zygotes or amphionts 

 (spores) rounded. 



Genus Schaudinnella Nusbaum. Trophozoites elongate spindle, 

 free in lumen or attached to gut wall; sporadins male or female; 

 spherical macrogametes and fusiform microgametes; zygotes or 

 amphionts encapsulated, passed out of host or enter gut epi- 

 thelium, dividing to produce many sporozoites (autoinfection). 



S. henleae N. (Fig. 177, h, c). In gut of Henlea leptodera; 

 mature trophozoites about 70ju by Q/x; attached trophozoite with 

 a clear wart-like epimerite; female and male sporadins; macro- 

 gametes, 5-7.5^1 in diameter; microgametes, spindle-form, l-1.25^i 

 long; sporozoites rounded oval, 2.5-3/x in diameter. 



Family 7 Diplocystidae Bhatia 



Coelomic or gut parasites of insects; trophozoites solitary or 

 associated early in pairs; spores round or oval, with 8 sporozoites. 



Genus Diplocystis Kunstler. Trophozoites spherical to oval; 

 association of 2 individuals begin early in spherical form; spores 

 round or oval, with 8 sporozoites; in coelom of insects. 



