Species: 0.5-1 mm long; anterior end expanded; body surface with groups of longer cilia; posterior portion drawn out and often within a gelatinous tube (lorica); macronucleus long band-form (Kudo, 1966). Body attenuated, peristome widely expanded, attains 0.5-1.0 mm; peristome has no central raised dome; somatic bristles present; gelatinous lorica; macronucleus moniliform but usually observed as a long rod; colourless (Carey, 1992).

200 μm 400 μm 600 μm; x 100

Stentor roeseli (?), x 200, x 400, by Y. Tsukii
100 μm 200 μm 300 μm; x 200 : 50 μm 100 μm 150 μm; x 400