OTHER PROTOZOA 8 1 



Phylum Protozoa 



Class i. Rhizopoda. Type: Ameba proteus. Protozoa usually 

 simply in structure, moving by means of pseudopodia; 

 protoplasm naked. 

 Order Gymnameba. Without shells. 



Family Amebidae. Pseudopodia lobose. 



Genus Ameba. Ectoplasm and endoplasm distinct. 

 Species proteus. (Named after a sea god who had the 

 power of assuming different shapes.) 



Class 2. Mastigophora. Types: Euglenamridis, Volvox globator. 

 Protozoa with one or more flagella; simplest forms 

 resemble bacteria. 



Order Euglenida. Large forms with one or two flagella; 

 mouth at base of flagellum through which contractile vacuole 

 opens to outside. 



Family Euglenidae. Elongate; one flagellum; red eye spot; 



green chromatophores. 

 Genus Euglena. Both ends contracted. 



Species viridis (green). 



Order Volvocina. Colonial forms with two flagella. 

 Family Volvocaceae. 



Genus Volvox. Colonies of many cells in a sphere. 

 Species globator (a ball). 



Class 3. Infusoria. Type: Paramecium caudatum. Locomotor 

 organs, cilia, permanent or limited to young stages; 

 two kinds of nuclei, macronuclei and micronuclei. 

 Order Holotrichida. Cilia similar all over body; trichocysts 

 present. 



Family Paramecidae. Oral groove present. 



Genus Paramecium. Mouth near middle of body; phar- 

 ynx short; oral groove oblique. 

 Species caudatum (tailed). 



