Family: With two flagella; one directed anteriorly and the other posteriorly and trailing
(recurrent flagellum); flagella orininate in anterior end; one to several contractile vacuoles (Kudo, 1966).
Genus: Body small, rigid; ventral furrow conspicuous, wide at anterior end; one flagellum arises from anterior end and the other from middle of body; fresh water (Kudo, 1966).
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C. loxodes Stein: 18-30 μm long,
14 μm wide; cytoplasm with refractile golbules
(Kudo, 1966).