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Spirotrichea: Stichotrichida: Spirofilidae (formerly Strongylidiidae)

 Strongylidium sp.

Strongylidium Family: Cirral file ends dorsally; body long, tapered at rear (Illustrated Guide, 1985).
Genus: Body ovoid, tail region absent (Carey, 1992). Same as the family (Illustrated Guide, 1985). Body elongate, cylindroid, adoral zone not narrowed; 4-5 frontal cirri; 2-5 spiral rows of ventral cirri; short peristomal area (easily distinguished from Stichotricha by peristome); not tube-dwelling (?) (How to know the protozoa, 1979).
Species:

Strongylidium sp., cell body 170 μm long, 35 μm wide, L/W=4.9, x 200, x 400, x 640, No.1, Karakemi marsh, Yasaka, Omachi city (formerly Yasaka village), Nagano Pref., Japan, June 4, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Strongylidium Strongylidium Strongylidium Strongylidium
Strongylidium Strongylidium Strongylidium

Images of collecting locality: No.1, Karakemi marsh, Yasaka, Omachi city (formerly Yasaka village), Nagano Pref., Japan, June 4, 2007 by Y. Tsukii

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