Family: Two long flagella, 1-2 chloroplasts and 1-2 contractile vacuoles present
Genus: Cell body naked, colorless (without chloroplasts), a contractile vacuole present, colony embedded in a gelatinous matrix of various shape (Starmach, 1985).
Species: colony within a gelatinous matrix straight or curved (Starmach, 1985).
cf. Uroglena Ehrenberg: With connecting processes (Kudo, 1966).