Sporozoa 297 



mites, and ticks. The type genus is Hepatozoon Miller (50; Fig. 6. 15, 

 J-M), represented by several species in birds and mammals. 



Family 3. Karyolysidae. The sporoblasts become sporokinetes which 

 invade the egg of a mite before secreting sporocyst membranes. Gameto- 

 cytes appear in erythrocytes of the vertebrate host. Several species of 

 Karyolysus Labbe (115; Fig. 6. 16, F-K) have been described from lizards. 



Fig. 6. 16. A-E. Haemogregarina stepanowi Danilewsky, xl890 (after 

 Reichenow): microgainetocyte (A); macrogametocyte (B); syzygy (C); schi- 

 zont in erythrocyte (D); merozoites in erytlirocyte (E). F-K. Karyolysus lacer- 

 tarum (Danilewsky) Labbe (after Reichenow): gametocyte in erythrocyte 

 (F), xl050; oocyst producing sporoblasts (G), x800; motile sporokinete (H) 

 and sporokinete in egg of mite (I), xl050; sporocyst in larval mite (J), x800; 

 merozoite in endothelial cell (K), xl050. 



Order 2. Eimeriida. These Coccidia differ from the Adeleida in the 

 absence of syzygy. Certain species are economically important as parasites 

 of poultry, quail, pheasants, cattle, sheep, and such fur-bearing animals 

 as the fox and mink (6, 12). Problems of control are aggravated by the 

 survival of oocysts for prolonged periods on the soil. Six families of 

 Eimeriida are often recognized. However, Hoare (51) has suggested a 

 division of the group into only two families, the Selenococcidiidae and 

 the Eimeriidae, the latter containing six subfamilies. 



