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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:
Similar Genus ->> Anisonema; Rhabdomonas

Entosiphon sp., cell body 25 μm long, 16 μm wide, longitudinal grooves wide and few in number (3 ? at one side), central groove 2 μm wide, anterior flagellum very short, x 400, x 640,Tega-numa, Abiko city, Chiba Pref., Japan, October 2000 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Entosiphon Entosiphon 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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