20 PROTOZOA 



Subclass 2. Coccidiomorpha. 



Found in all groups of animals. Typically 

 intracellular in all stages of life history. 

 Life cycle varies greatly in complexity. 



Order 1. Coccidiida- 

 Suborder 1. Eimeriina. 



With few exceptions, epithelial-cell para- 

 sites with sporoblasts in a capsule. 

 (Eimeria.) 



Suborder 2. Hemosporidia. 



Typically blood parasites of vertebrates. In 

 many forms the entire sexual period of the 

 life cycle takes place in an intermediate 

 host, as the mosquito. (Plasmodium.) 



Suborder 3. Babesiina. 



Blood parasites of vertebrates. They lack 

 melanin pigment. (Babesia.) 



Order 2. Adeleida. 



With no flagellated gametes. Sexual proc- 

 ess similar to pseudoconjugation in gre- 

 garines. (Adelea.) 



Class 2. Cnidosporidia. 



(This and the following class were formerly 

 classed under Neosporidia.) Sporulation 

 takes place during the "trophic" phase of 

 life cycle. Sporozoites are amoebulae. 



Order 1. Myxosporidia. 



Typically parasites of fishes. Free or tis- 

 sue-inhabiting. Spore capsule with 2 valves. 

 Usually 2 polar capsules. (Myxidium.) 



Order 2. Actinomyxida. 



Parasites of annelids. Spores with 3 polar 

 capsules. (Sphaeractinomyxon.) 



Order 3. Microsporidia. 



Minute organisms — rarely more than 1 

 polar capsule, sometimes none. (Nosema.) 



Class 3. Acnidosporidia. 



Includes the group formerly known as the 

 Sarcosporidia. The initial stage of the life 

 cycle occurs in the muscle cells of verte- 

 brates. Spores with a single polar capsule. 

 (Sarcocystis.) 



