34 INTRODUCTION TO THE PROTOZOA 



Family TOXOPLASMATIDAE 



With pseudocysts and probably true cysts as well. Multi- 

 plication by binary fission or endodyogeny and possibly by 

 schizogony in young pseudocysts. 



Besnoitia 



Encephalilozoon 



Toxoplasma 



Class CNIDOSPORASIDA 



With spores containing polar filaments. Nucleus vesicular. All parasitic. 



Order MYXOSPORORIDA 



Spores comparatively large, with bivalve shell and 1 to 4 polar cap- 

 sules. Parasites of lower vertebrates, especially fish. 



Order MICROSPORORIDA 



Spores comparatively small, with 1 -piece shell and 1 or 2 polar fila- 

 ments. Typically parasites of invertebrates and fish. 



Class CILIASIDA 



With two types of nucleus--macronucleus and micronucleus. With cilia at some 

 stage of the life cycle. 



Subclass HOLOTRICHASINA 



Without or with poorly developed adoral zone of membranelles (except in 

 Peritrichorida). 



Order GYMNOSTOMORIDA 



Cytostome opens directly at surface or else into a slight depression 

 which lacks well-developed peristomial ciliature. 



Family BUETSCHLIIDAE 



Cytostome usually at anterior end. Anterior concretion- 

 vacuole (possibly a statocyst), one or more contractile 

 vacuoles and posterior cytopyge present. Cilia uniformly 

 distributed over body or restricted to certain areas. 



Alloiozona Bundleia 



Ampullacula Didesmis 



