|  Genus (Perty, 1849): Oral cavity large, over most of ventrum; oral cilia as 1 long polykinetid 
(Illustrated Guide, 1985).  
Oval; dorsal side convex, ventral side concave; cytostome 3/4 to 4/5 the body length; 
on its left with a large membrane composed of may ciliary rows; contractile vacuole in 
mid-dorsal region; macronucleus ellipsoid, subterminal; a micronuleus; caudal cilia (Kudo, 1966). 
 Species:
 |