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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 sulcatum (Dujardin) Stein, cell body 21 μm long, 12 μm wide, L/W=1.8, x 640, Kannon-numa Forest Park (pond), Shimogo town, Fukushima Pref., Japan, July 10, 2005, collected by Eizaburo Tsukii, photo by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Entosiphon Entosiphon

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