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Spirotrichea: Stichotrichia: Stichotrichida: Urostylina

Ehrenberg, 1830

Suborder (Urostylina): Frontoventral cirri as 2 or more zig-zag files almost full length of ventrum.

Parauroleptus (or Strongylidium ?), cell body 112 μm long, 33 μm wide, both marginal cirral files present, two frontoventral files curved from anterior right to posterior left, x 400, x 640, Saitama Pref. Japan, 2000, 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
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