INVERTEBRATE ZOOLOGY 



PROTOZOA 



Unicellular Animals 



Subphylum 1. Zoomastigophora (Animal Flagellates). 



Animal flagellates with no chromatophores 

 or chlorophyl. Locomotor organs of adult 

 phases consist of one or more motile struc- 

 tures called flagella. (The animal flagel- 

 lates are similar in other general respects 

 to the plant flagellates — Phytomastigophora 

 of many older zoological classifications — 

 now almost universally classed as members 

 of the Algae.) 



Class 1. Protomastigota. 



Order 1. Protomonadida. 



Minute forms. One flagellum, or a prin- 

 cipal flagellum and 1 or 2 accessory flagella. 

 (Mastigamoeba, Multicilia, Trypanosoma, 

 Peranema, Monas, Cercomonas, Bodo.) 



Class 2. Metamastigota. 



Order 1. Hypermastigida. 



With numerous flagella and complicated in- 

 ternal structure. All but one genus 

 (Lophomonas) parasitic in termites. (Loph- 

 omonas, Trichonympha, Joenia.) 

 Order 2. Polymastigida. 



Minute forms with highly developed kinetic 

 elements. 3 to 8 flagella. Characteristic 

 parasites of digestive tract. (Giardia, Trich- 

 omonas, Pyrsonympha, Streblomastix.) 



Subphylum 2. Sarcodina. 



No permanent locomotor organs in adult 

 phase of the life history; the cells moving 

 and ingesting food by temporary pseudo- 

 podia. "Young" phases may be amoeboid 

 or flagellate. (Minchin, pp. 178 and 234r- 

 237.) 

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