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Spirotrichea: Stichotrichia

 Unidentified

Suborder: Frontoventral cirri as 2 or more zig-zag files almost full length of ventrum.
Family: Frontal cirri differ in size and/or pattern from ventral ones of files; "collar" extends short distance along right edge of body; oral area not U-shaped (Illustrated Guide, 1985).

Tachysoma ?? or similar species, cell body 74 μm long, 22 μm wide, no caudal cirri, no transverse cirri, two large macronuclei, x 640, Yaku Island, Kagoshima Pref, Japan, April 2001, collected by N. Kinoshita, photo by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
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