Order: No kinetidal specializations at oral region.
Family (Kahl 1926): Cytostome terminal; ciliation uniform; usually encased in a pseudochitinous lorica (Kudo, 1966). Genus: Ovoid with caudal cilia; lorica flask-shape, ringed; cytostome with four rows of long cilia; body surface with shorter cilia; macronucleus round (Kudo, 1966). Large protruding vacuole absent (Carey, 1992).
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V. ciliata Tatem: Body about 100 μm long
(Kudo, 1966).
V. parvula Kahl, 1928: Ovoid;
25-30 μm long; cytostome surrounded by long cilia;
a long caudal cilium; a macronucleus central; lorica vase-shaped with neck (Carey, 1992).