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Euglenophyceae: Heteronematales
Euglenida: Heteronematina

 Entosiphon sp.
Stein

Entosiphon Genus: Oval, flattened; more or less rigid; flagella arise from a cytostome, one trailing; protrusible cytopharynx a long conical tubule (siphon) almost reaching posterior end; fresh water (Kudo, 1966).
Species:
Similar Genus ->> Anisonema; Rhabdomonas

Entosiphon sp. (or sulcatum small variety ?), cell body 25 μm long, 12 μm wide, posterior end more or less tapered, x 400, Japan, 199? by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Entosiphon Entosiphon Entosiphon

Entosiphon sulcatum (Dujardin) Stein, 1878: About 20 μm long (Kudo, 1966; How to know the protozoa, 1979); trailing flagellum more than twice the length of anterior one (How to know the protozoa, 1979); 20-25 μm long, 10-15 μm wide (Illustrated Guide, 1985); Cell body ovoidal with 6-7 longitudinal grooves, 20-30 μm long, 12-18 μm wide; anterior flagellum nearly the same as the cell body in length, trailing flagellum about twice of the cell body in length (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).

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