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Oligohymenophorea: Peritrichia: Sessilida: Epistylididae

Epistylis microdiscum
Stiller, 1963

Epistylis Genus: Colonial; without lorica; less than 3 turns of oral cilia; swarmer with median scopula (Illustrated Guide, 1985). Stalk not contractile; body contractile.
Similar Genus ->> Campanella

Epistylis microdiscum (or similar species), cell body 48 μm long, 28 μm wide, x 200, x 400, x 640, Japan, November 1998, by Y. Tsukii
scale 100 μm scale 200 μm scale 300 μm; x 200 : scale 50 μm scale 100 μm scale 150 μm; x 400
Epistylis Epistylis Epistylis Epistylis Epistylis

* Epistylis microdiscum Stiller, 1963: Cell body ovoid, 45-55 μm long, 30-35 μm wide; pellicle slightly striated; peristomal disc like mound; cytopharynx straight 1/4 of cell length; contractile vacuole near peristome; macronucleus C-shaped (Zensei-Doubutu Zukan, 1981).

Epistylis lacustris Imhoff, 1884: Cell body cylindroid; 50-75 μm long, 20-35 μm wide; pellicle striated; peristomal disc mounded; cytopharynx 1/2 of cell body; macronucleus C-shaped; stalk branches dichotomously with longitudinal fine striation (Zensei-Doubutu Zukan, 1981).

Epistylis chrysemidis: 230-250 μm long; extra collar around peristome when expanded; cytopharynx large, deep; stalk branches dichotomously lacking myonemes; fresh water (How to know the protozoa, 1979).
Epistylis cambari: Peristome 50 μm; common on gills of crayfish (How to know the protozoa, 1979).
Epistylis niagarae: Up to 180 μm long; on western painted turtle (How to know the protozoa, 1979).
Epistylis urceolata: 160 μm long; common on larvae of Chironomus (How to know the protozoa, 1979).

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