106 The Classification of Protozoa 



Kent's system differed from more recent ones in several respects— assign- 

 ment of the Mycetozoa and the Spongida (sponges) to the Flagellata; 

 inclusion of the gregarines in the Rhizopoda; recognition of a Class Ten- 

 taculifera to include the Suctoria and Actinaria. 



Biitschli (2) recognized the Class Sporozoa, although some of the mod- 

 ern Coccidia were grouped with gregarines. The Microsporidia were listed 

 as an appendix to the Sporozoa, with exact relationships to be determined. 

 Among the Mastigophora, the Euglenoidina included several of the 

 modern Chloromonadida, while such types as Bodo (now in the Proto- 

 mastigida) and Ejitosiphon (one of the Euglenida) were assigned to the 

 Heteromastigoda. Butschli's Isomastigoda included the Chrysomonadida, 

 Cryptomonadida and Phytomonadida of current systems, as well as cer- 

 tain Polymastigida and the dinoflagellate Oxyrrhis. The Trichonym- 

 phidae (now in the Hypermastigida) were listed as an appendix to the 

 ciliates. 



Class 1. Sarkodina 

 Subclass 1. Rhizopoda 

 Order 1. Rhizopoda 

 Suborder 1. Amoebaea 

 Suborder 2. Testacea 

 Suborder 3. Perforata 

 Subclass 2. Heliozoa 

 Subclass 3. Radiolaria 

 Class 2. Sporozoa 



Subclass 1. Gregarinida 

 Order 1. Monocystidea 

 Order 2. Polycystidea 

 Subclass 2. Myxosporidia 

 Subclass 3. Sarcosporidia 

 Class 3. Mastigophora 

 Order 1. Flagellata 

 Suborder 1. Monadina 

 Suborder 2. Euglenoidina 



TAXONOMIC SYSTEMS OF THE 

 TWENTIETH CENTURY 



Suborder 3. Heteromastigoda 

 Suborder 4. Isomastigoda 

 Order 2. Choanoflagellata 

 Order 3. Dinoflagellata 

 Suborder 1. Adinida 

 Suborder 2. Dinifera 

 Order 4. Cystoflagellata 

 Class 4. Infusoria 

 Subclass 1. Ciliata 



Order 1. Gymnostomata 

 Order 2. Trichostomata 

 Suborder 1. Aspirotricha 

 Suborder 2. Spirotricha 

 Section 1. Heterotricha 

 Section 2. Oligotricha 

 Section 3. Hypotricha 

 Section 4. Peritricha 

 Subclass 2. Suctoria 



The system proposed by Calkins (3) showed several changes. The 

 Suborder Perforata (Foraminifera) became the Order Reticulariida. The 



