412 PROTOZOOLOGY 



produce numerous (up to 30) spores, each with 8 sporozoites; in 

 Diptera, AnneUda, and Sipunculoida. 



*S. gregarinoides L. (Fig. 185). In gut of larvae of Ceratopogon 

 solstitialis; mature schizonts up to 400/.t by 15;u; curved or spirally 

 coiled; gametocytes 30-50m long; cysts ovoid, 16-32/x long; spores 

 biconical, 8m by 4^. 



Genus Syncystis Schneider. Schizogony and sporogony extra- 

 cellular; young trophozoites elongate, amoeboid; mature schi- 

 zonts more or less spheroidal, producing some 150 merozoites; 

 cysts spherical, producing about 150 spores. One species. 



S. mirdbilis S. (Fig. 187, k, I). In coelomic fluid and fat bodies 

 of Nejpa cinerea; merozoites, 7^ long; cysts spherical; spores 

 navicular, 3-4 spines at ends, 10/x by 6^, with 8 sporozoites (Steo- 

 poe). 



Genus Mattesia Naville. Schizogony in the adipose tissue cell; 

 2 spores produced by a pair of gametocytes. One species. 



M. dispora N. (Fig. 187, m). In adipose tissue cells of larvae of 

 the flour moth, Ephestia kuhniella and Plodia interpunctella (pupa 

 and adult also); schizonts 2.5-12^ long; cyst 8-12^ in diameter, 

 with 2 spores, each with 8 sporozoites; spores 14^ by 7.5ai (Na- 

 ville); llyu by 6m (maximum 13.5m by 8m) (Musgrave and Mackin- 

 non). Highly pathogenic according to Musgrave and Mackinnon. 



Genus CauUeryella Keilin. Schizogony extracellular; each 

 gametocyte gives rise to 8 gametes, a pair forming 8 zygotes or 

 spores; spore with 8 sporozoites; in gut of dipterous larvae. Sev- 

 eral species. 



C. pipientis Buschkiel (Fig. 186, j, k). Average trophozoites 

 50-60m by 23-26m; with paraglycogen grains; schizogony produces 

 30-38 merozoites. 



Genus Lipotropha Keilin. Schizogony and sporogony intracel- 

 lular; cyst contains 16 spores, each with 8 sporozoites; in fat body 

 of Systenus larvae. One species. 



L. macrospora K. (Fig. 187, n). Spores about 13.5m by 3m. 



Genus Selenidium Giard. Schizogony intracellular; many 

 spores produced by a pair of extracellular gametocytes; spore 

 with 4 or more sporozoites; in gut of annelids. 



*S. potamillae Mackinnon et Ray (Fig. 187, a-c). Trophozoites 

 euglenoid, average size 40m by 15m; longitudinal striae; cysts 

 oblong, producing many spores; spore, spherical with 4 (up to 10) 

 sporozoites; in gut of the polychaete, Potamilla reniformis. 



