PROTOZOA. 3 



Order 1. Pantastomatida. 



Cell more or less ameboid. 1 or several flagella. 

 (Mastigamoeba, Multicilia.) 



Order 2. Protomastigida. 



Minute forms — nutrition holozoic, saprophytic, 

 or parasitic. One flagellum, or a principal 

 flagellum and 1 or 2 accessory flagella. (Monas, 

 Cercomonas, Bodo, Trypanosoma, Choano- 

 flagellates.) 



Order 3. Polymastigida. 



Minute forms with highly developed kinetic ele- 

 ments. 3 to 8 flagella. Characteristic parasites 

 of digestive tract. (Giardia, Trichomonas.) 



Order 4. Hypermastigida. 



With numerous flagella. Parasitic in insects. 

 (Lophomonas, Trichonympha.) 

 Subphylum 3. Sporozoa. 



Without flagella or cilia in the adult period of 

 the life-cycle. Reproduction is by spore forma- 

 tion. All are endoparasites. 

 Class 1. Telosporidia. 



Sporulation phase of the life-cycle is distinct 

 from and follows the trophic phase. 

 Subclass 1. Gregarinida. 



Typically lumen-dwelling parasites of inver- 

 tebrates. Reproduction by sporogony alone or 

 by sporogony and schizogony. 



Order 1. Eugregarinida. 



Comprises most of the gregarines. No asexual 

 reproduction. Usually 8 sporozoites formed. 

 (Monocystis, Gregarina.) 



Order 2. Schizogregarinida. 



Parasites of the digestive tract of arthropods, 

 annelids, and tunicates. With an asexual cycle. 

 (Schizocystis.) ^ 

 Subclass 2. Coccidiomorpha. 



Found in all groups of animals. Typically in- 

 tracellular in all stages of life-history. Life- 

 cycle varies greatly in complexity. 



Order 1. Coccidia. 



Usually epithelial-cell parasites with sporo- 

 blasts in a capsule. Gametes typically aniso- 

 gamous. (Eimeria.) 



