282 Sporozoa 



Family 1. Ophryocystidae. Merogregarina Porter (Fig. 6. 5, G) Avith intracellular 

 merogony; Ophryocystis Schneider (78; Fig. 6. 5, A-F), with extracellular merogony; and 

 Spirocystis Leger and Duboscq (80), with intracellular merogony. 



Family 2. Schizocystidae. CaiiUeryella Keilin (Fig. 6. 6, D, E), Lipocystis Grell (40; 

 Fig. 6. 6, I-L), Lipotropha Keilin (Fig. 6. 6, F), Machadoella Reichenow (117; Fig. 6. 

 5, H-N), Meroselenidium Mackinnon and Ray (87; Fig. 6. 6, B, C), Schizocystis Leger 

 (69; Fig. 6. 6, A), Selenidium Giard (109, 114; Fig. 6. 6, G, H), Selenocystis Dibb (28), 

 Siedleckia Caullery and Mesnil, and Syncystis Schneider. 



Order 2. Eugregarinida. Each sporozoite which survives after reaching 

 the host develops directly into a mature trophozoite which may eventually 

 become a gamont. The Eugregarinida may be divided into two suborders, 

 Acephalina and Cephalina. The body of Cephalina is differentiated into 

 a protomerite and a deutomerite, and the typical protomerite is equipped 

 with an epimerite, at least in attached stages. The body of the Acephalina 

 is not differentiated into segments. The acephaline sporozoite commonly 

 enters a tissue cell and grows for some time as an intracellular parasite. 

 In cephaline gregarines, penetration of tissue cells is often incomplete 

 and may not occur at all. 



Suborder 1. Cephalina 



Division into families is based on such features as structure of the 

 epimerite, presence or absence of early syzygy, form of the trophozoites, 

 structure of the spore membrane and shape of the spore, and methods by 

 which the spores are released from the gametocyst. 



Family 1. Acanthosporidae . The epimerite is usually knob-like or glob- 

 ular, with or without hooks, spines, or filaments in different genera. Early 

 syzygy is unknown. The spores, usually equipped with polar and equa- 

 torial spines (Fig. 6. 4, B), are released by rupture of the gametocyst. 



The family includes the following genera (66): Acanthospora Leger (Fig. 6. 7, B), 

 Ancyrophora Leger (Fig. 6. 7, A), Cometoides Labbe (Fig. 6. 4, N), Corycella Leger 

 (Fig. 6. 1, E), Primatospora Ellis (Fig. 6. 7, J). 



Family 2. Actinocephalidae. The epimerite may be short and button- 

 like, may lie at the end of a stalk, and may or may not be spiny. Early 

 syzygy is unknown. The often biconical but sometimes asymmetrical 

 spores (Fig. 6. 7, K-M) are released by rupture of the gametocyst. 



The family contains the following genera (66): Actinocephalus Stein (140; Figs. 6. 

 2, A, B; 7, D-G), Amphorocephalus Ellis, Amphoroides Labbe (Fig. 6. 7, I), Anthorhyn- 

 chiis Labbe (Fig. 6. 7, O), Aslerophora Leger, Beloides Labbe, Bolhriopsis Schneider, 

 Coelorhynchus Labbe (40; Fig. 6. 7, M, N), Discorhynchus Labbe, Geneiorhynchus 

 Schneider, Legeria Labbe, Phialoides Labbe, Pileocephalus Schneider, Pyxiuia Hammer- 

 schmidt, Schneideria Leger, Sciadophora Labbe, Steinina Leger and Duboscq (Fig. 6. 

 7, C, L), Stictosopora Leger, Stylocystis Leger, Taeniocystis Leger (77; Figs. 6. 1, A; 7, 

 H). 



