272 



PROTOZOOLOGY 



0. termo (Ehrenberg) (Fig. 118, a). Spherical or oval; anterior end 

 lip-like; flagellum about twice body length; a contractile vacuole; 

 5-20/1 in diameter; stagnant water. Hardin (1942) cultured the 

 organism bacteria-free. 



Genus Thylacomonas Schewiakoff. Pellicle distinct; cytostome 

 anterior; one flagellum; contractile vacuole anterior; rare. 



T. compressa S. (Fig. 118, h). 22/x by 18m; flagellum body length; 

 fresh water. 



Genus Ancyromonas Kent. Ovate to triangular; free-swimming or 

 adherent; flagellum trailing, adhesive or anchorate at its distal end, 

 vibratile throughout remainder of its length; nucleus central; a 

 contractile vacuole; fresh or salt water. 



Fig. 118. a, Oikomonas termo, X1330 (Lemmermann) ; b, Thylacomonas 

 compressa, X640 (Lemmermann); c, Ancyromonas contorta, X2000 (Lem- 

 mermann); d, Platytheca microspora, X650 (Stein). 



A. contorta (Klebs) (Fig. 118, c). Triangular, flattened; posterior 

 end pointed; 6-7m by 5-6^; flagellum short; a contractile vacuole; 

 standing fresh water. 



Genus Platytheca Stein. With a flattened pyriform lorica, with a 

 small aperture; 1 or more contractile vacuoles; fresh water. 



P. microspora S. (Fig. 118, d). Lorica yellowish brown, with a 

 small aperture; 12-18^ long; flagellum short; among roots of Lemna. 



Family 5 Trypanosomatidae Doflein 



Body characteristically leaf-like, although changeable to a certain 

 extent; a single nucleus and a blepharoplast; a flagellum originates 

 in a basal granule which may be independent from, or united with, 

 the blepharoplast (Figs. 9; 119); basal portion of flagellum forms 

 outer margin of undulating membrane which extends along one side 

 of body; exclusively parasitic; a number of important parasitic 

 Protozoa which are responsible for serious diseases of man and 

 domestic animals in various parts of the world are included in it. 



