Genus (Claparède and Lachmann, 1858):
Ovoid or cylindrical; apical cytopharynx; posterior bald; caudal cilia present;
contractile vacuole posterior (Carey, 1992).
Species:
Urotricha sp. similar to U. agilis,
cell body pyramidal in shape, 15 μm long, 17 μm wide,
posterior without ciliation but two caudal cilia, 8 μm long,
x 400, Japan, 1997 by Y. Tsukii 50 μm
100 μm
150 μm; x 400
Urotricha agilis:
Small; 20 μm long;
pyriform or pyramidal in shape; posterior without ciliation except for a singlecaudal
cilium; cytostome small; macronucleus spherical, centrally placed (Carey, 1992).