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).
Genus: With 2 or more right marginal files of cirri (Illustrated Guide, 1985). Ellipsoid; flexible; posterior rounded; flattened ventral surface with 4-10 rows of cirri; 2 marginal rows; 3 or more frontals; 5-12 anals (Kudo, 1966). Ovoid to elongate with large number of ventral rows of cirri (files); transverse cirri present; frontal cirri undifferentiated from ventrals (Carey, 1992).

->> Description at WPRNO

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Urostyla sp.1 238-245 μm Japan, 1998	Urostyla sp.1 230 x 80 μm Futayo-no-ike Haguro mountain Yamagata, 2005	Urostyla sp.1 262-275 μm Japan, 199?	Urostyla sp.2 or Paraurostyla ? μm Japan, 1997
U. grandis ? protalgol stain μm Saitama, 1999

Similar Genus -> > Holosticha ; Pseudourostyla

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2 or more right marginal files of cirri .
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