Genus: Euglenas in a close fitting lorica; a single long flagellum extends through small opening;
lorica with or without short collar; yellow to brown (How to know the protozoa, 1979).
Lorica often possesses numerous spines, composed of ferric hydroxide impregnated with brown
manganic compound (Kudo, 1966).
Species:
Trachelomonas robusta Swirenko:
Lorica nearly spherical or ovoid, covered with short spines; no collar;
20-26 μm long,
17-22 μm diam.
(Illustrations of The Japanese Fresh-water Algae, 1977).