|  Species: 150-500 μm long, 
20-40 μm wide; cylindrical, 
almost always twisted; anterior end rounded, posterior end pointed; 
numerous discoid chloroplasts; two ovoid paramylon (paramylum) bodies; 
stigma large; sluggish (Kudo, 1966).  
Body flattened, twisted, with longitudinal groove; two oval paramylon (paramylum) rings
(How to know the protozoa, 1979). |