Genus: When extended, trumpet-shaped or cylindrical; highly contractile; some with
mucilaginous lorica; conspicuous peristomal field frontal; contractile vacuole anterior-left; fresh water
(Kudo, 1966).
Stentor with endosymbiotic Chlorella, x 100, x 200, Aug. 7-13 1999, Vermont-Maine U.S.A., by Y. Tsukii