PROTOZOA IN GENERAL 



269 



they serve the animal as its means of locomotion. In some species 

 they serve the organism in feeding. The flagellum is a contractile 

 structure. There are some species in which exist both flagellate 

 and amoeboid stages. This seems to show a rather close relation 

 of this class to the next. The class also has a close relationship 

 with plants in that many of its representatives possess chlorophyll. 

 These forms are frequently classified as plants by botanists. The 

 class Mastigophora is divided into two groups: (a) the animal-like 

 forms which may be holozoic, saprophytic, or entozoic, and (b) 

 those more plantlike forms which may be holophytic, saprophytic, 



Cercomonas 



Monoaiga 



Chilomoms 





Codorjosi'ga. 



i^^^ 



Phaous 



Trachelmonas 



Peranema Maatigamoeba 



jPig. 86. — Group of representative Mastigophora. (Reprinted by permission from 

 Curtis and Guthrie, Textbook of General Zoology, John Wiley and Sons, Inc.) 

 (Figure of Chilomonas modified.) 



or entozoic. Holozoic refers to forms which ingest and digest food 

 material. Saprophytic refers to the habit of absorbing nonliving 

 organic matter in solution directly through the surface of the body. 

 Entozoic is a name applied to forms which live within the body of 

 other animals, as in the intestine or the blood stream. 



A large number of Mastigophora live in quiet streams, ponds, lakes, 

 and in the ocean. Euglena is a very commonly studied fresh-water 

 form. Noctiluca is an interesting marine form which is pelagic (lives 

 at the surface) in its habits and appears as a thick, creamy scum. 



