* Trachelomonas playfairi Deflandre: Lorica broad ellipsoid, smooth, rounded at both end; collar slightly curved; 19-23 μm long, 16-18.5 μm diam. (Illustrations of The Japanese Fresh-water Algae, 1977).
Trachelomonas horrida Palmer: 40 μm long; covered with short spines (How to know the protozoa, 1979).
Trachelomonas teres: 35 μm; lorica ovoid, with distinct collar (How to know the protozoa, 1979).