Genus: Ovoid, spindle-form or cylindrical; cytostome at anterior end in a slit; right ridge thickened and lip-like (Kudo, 1966). Oral apparatus apical and slit-like, the right edge of which is thickened and bears long protoplasmic processes containing trichocysts; single macronucleus & contractile vacuole; caudal cilia present (Carey, 1992).

50 μm 100 μm 150 μm; x 400

* Plagiocampa incisa Kahl, 1933: Cell body ovoid but not symmetrical, 50 μm long; cytopharyngeal apparatus small; single caudal cilium; a large macronucleus in the mid-body region; a single contractile vacuole posteriorly (Carey, 1992).

Plagiocampa rouxi Kahl, 1926: Cell body ovoid, pointed posteriorly, 40-80 μm long; apical rfegion with cytoplasmic processes; a single caudal cilium; many vacuoles fill the cytoplasm; a single contractile vacuole posteriorly (Carey, 1992).