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).
Trachelomonas armata var. longispina (Playfair) Deflandre: Lorica ellipsoid, no collar, covered with short dented projections, long spiny projections (3-6 μm long) at posterior end, size 41-44 μm long, 32-34 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).