The Classification of Protozoa 109 



Order 1. Myxosporidia 

 Order 2. Actinomyxidia 

 Order 3. Microsporidia 

 Order 4. Sarcosporidia 



Division 2. Haplosporidia 

 Order 1. Haplosporidia 

 Class 4. Infusoria 

 Subclass 1. Ciliata 



Section 1. Aspirigera 

 Order I. Holotricha 



Suborder 1. Astomata 

 Suborder 2. Gymnostomata 

 Suborder 3. Hymenostomata 

 Section 2. Spirigera 



Order 1. Heterotricha 

 Suborder 1. Polytricha 

 Suborder 2. Oligotricha 



Order 2. Hypotricha 



Order 3. Peritricha 

 Subclass 2. Acinetaria (Suctoria) 



In 1926 two new systems, proposed by Calkins (4) and Wenyon (23), 

 reflected several diff^erences of opinion in treatment of the Sarcodina, 

 Mastigophora, and Sporozoa. Wenyon's separation of the Cnidosporidia 

 from other Sporozoa as a group of equal rank apparently represents a 

 more realistic appraisal than that reflected in most classifications. In both 

 systems, the Chrysomonadida and Cryptomonadida appeared as separate 

 orders, and the Chloromonadida also in that of Calkins. ^Venyon's trans- 

 fer of the Cystoflagellata to the Zoomastigina is not generally favored. In 

 the Ciliata, Wenyon followed Minchin in stressing differences in ciliature 

 of the Holotrichida and the other orders. Wenyon retained the subphyla 

 Plasmodroma and Ciliophora, whereas Calkins advanced the Mastigo- 

 phora, Sarcodina, Sporozoa, and Infusoria to subphyla. 



The system of Calkins (4): 



Subphylum 1. Mastigophora 



Class 1. Phytomastigoda 

 Order 1. Chrysomonadida 

 Order 2. Cryptomonadida 

 Order 3. Dinoflagellida 

 Order 4. Phyloinonadida 

 Order 5. Euglcnida 

 Order 6. Chloromonadida 



Class 2. Zoomastigoda 

 Order 1. Pantastomatida 

 Order 2. Protomastigida 

 Order 3. Polymastigida 

 Order 4. Hypermastigida 

 Subphylum 2. Sarcodina 



Class 1. Actinopoda 

 Subclass 1. Heliozoa 

 Subclass 2. Radiolaria 



Class 2. Rhizopoda 

 Subclass 1. Proteomyxa 

 Subclass 2. Mycetozoa 



The system of Wenyon (23): 



Subclass 3. Foraminifera 

 Subclass 4. Amoebaea 

 Subphvium 3. Infusoria 

 Class 1. Ciliata 



Order 1. Holotrichida 

 Order 2. Hcttrotrichida 

 Order 3. Oligotrichida 

 Order 4. Hypotrichida 

 Order 5. Peritrichida 

 Class 2. Suctoria 

 Subphylum 4. Sporozoa 

 Class 1. Telosporidia 

 Subclass 1. Gregarinida 

 Subclass 2. Coccidiomorpha 

 Order 1. Coccidia 

 Order 2. Haemosporidia 

 Class 2. Neosporidia 



Subclass 1. Cnidosporidia 

 Subclass 2. Sarcosporidia 



Subphylum 1. Plasmodroma 



Class 1. Rhizopoda 



Order I. Amoebida 



Order 2. Heliozoa 



Order 3. Radiolaria 



Order 4. Foraminifera 

 Order 5. Mycetozoa 

 Class 2. Mastigophora 



Subclass 1. Phytomastigina 

 Order 1. Chrysomonadina 



