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Oligohymenophorea: Hymenostoamtida: Turaniellidae

 Colpidium campylum
(Stokes, 1886) Bresslau

Colpidium Genus: Elongate reniform (kidney-shaped); typically one postoral ciliary row; cytostome small, triangular, 1/4 from anterior end toward right side; macronucleus rounded; a micronucleus; a contractile vacuole (Kudo, 1966).
Species: Cell body 50-70 μm long (How to know the protozoa, 1979; Kudo, 1966). 27-30 ciliary rows; preoral suture curved to right (Kudo, 1966).

Colpidium campylum (Stokes, 1886) Bresslau 1922, cell body 51-69 μm long, 21-26 μm wide, x 400, x 640, Japan, 1999 by Y. Tsukii
scale 100 μm scale 200 μm scale 300 μm; x 200
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* Colpidium campylum (Stokes): 50-70 μm long (How to know the protozoa, 1979; Kudo, 1966). 27-30 ciliary rows; preoral suture curved to right (Kudo, 1966).

Colpidium colpoda (Ehrenberg) (Tillina helia Stokes): 90-150 μm long, cytostome about 1/10 body length; 55-60 ciliary rows; preoral sutrue curved to left (Kudo, 1966).

Colpidium striatum Stokes ?: 50 μm long, similar to C. campylum, contractile vacuole further posterior (Kudo, 1966).

Colpidium echini (Russo): 37-64 (55) μm long, 21-28 (25) μm wide; 24 ciliary rows; cytostome ate anterior third; in the intestinal caeca of Strongylocentrotus lividus (Kudo, 1966).

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