SPOROZOA, GREGARINIDA 



565 



tached to the host epithelium by a foot-like organelle; isogametes 

 with a short flagellum; spores with four or eight sporozoites. One 

 species (Dibb, 1938). 



S. foliata (Ray) (Fig. 242, b-f). Trophozoites 30-250 /x long; pel- 

 licle with 16-24 striae; the broader end with which the organism is 

 attached to the host epithelium depressed ; surrounding this depres- 

 sion, a number of about 8/i long refringent filaments occur; while one 



■v.,»^r*T.>--- 



Fig. 242. a, two views of a spore of Lipocystis polyspora, X1485 

 (Grell); b-f, Selenocystis foliata (b, a mature trophozoite, X665 (Ray); 

 c, migration of nuclei of gametocytes to the surface of cyst, X565; d, 

 gamete in life; e, f, spores with four and eight sporozoites, X1130 (Dibb)). 



organism is still attached, biassociation by posterior ends takes 

 place; 26-226/x by 9-34/*; isogametes; subspherical spores about 8.5m 

 in diameter, with four or eight sporozoites; in the gut of the poly- 

 chaete, Scolelepis fuliginosa. 



Genus Machadoella Reichenow. Nematode-like, rigid; simple 

 rounded anterior end; thick pellicle, longitudinally striated; schi- 

 zogony in vermiform stage; head to head association of gameto- 

 cytes; cysts with 3-6 spores, each with 8 sporozoites. 



M. triatomae R. (Fig. 241, g-j). Schizonts about 55/x long; game- 

 tocytes 100-120/x long; schizogony into 6-8 merozoites; cysts with 

 3-6 spores; spore 10-1 1/x by 7-7. 5^; in Malpighian tubules of 

 Triatoma dimidiata (of Guatemala) (Reichenow, 1935). 



References 



Doflein, F. and Reichenow, E.: (1929) Lehrbuch der Protozoen- 



kunde. 5 ed. Jena. 

 Labbe, A.: (1899) Sporozoa. In: Das Tierreich. Part 5. 

 Naville, A.: (1931) Les Sporozoaires. M6m d.'hist. nat., Geneva, 



41:1. 

 Reichenow, E. : (1932) Sporozoa. Grimpe's Die Tierwelt der Nord- 



und Ostsee. 21 : pt. 2-g. 



