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Euglenophyceae: Heteronematales
Euglenida: Heteronematina

 Entosiphon sulcatum
(Dujardin) Stein, 1878

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: 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).
Similar Genus ->> Anisonema; Rhabdomonas

Entosiphon sp., cell body 21 μm long, 15 μm wide, cell body rounded, siphon very short, a few grooves at cell surface, posterior end more or less tapered, x 640, Torinome, Nasu-shiobara city (formerly Kuroiso city), Tochigi Pref., Japan, 2001 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Entosiphon Entosiphon Entosiphon
x 400, x 640
Entosiphon Entosiphon Entosiphon Entosiphon

Entosiphon sulcatum: 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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