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Spirotrichea: Stichotrichida: Urostylina: Urostylidae

Uroleptus musculus
(Müller, 1786) Stein

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).
Genus: Elongate body drawn out into a tail-like portion; 3 frontals; 2-4 rows of ventral cirri; marginals; no transverse cirri; sometimes rose- or violet-colored (Kudo, 1966). Frontventral cirri in zig-zag files; rear half narrowed, tail-like (Illustrated Guide, 1985).


Uroleptus sp. (U. musculus ?), cell body 104 μm long, 33 μm wide, x 640, Kurihashi, Saitama Pref., Japan, July 2001 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
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