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: 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).

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U. lamella ? 306 x μm cirri thick Saitama, 1999	U. lamella ? 275 x 59 μm cirri thin Saitama, 1999
U. limnetis ? 193 x 31 μm Shijuhachi-ike Shiga highland Nagano, 2005	U. limnetis ? 180 x 35 μm Nidanuma Tsuchiyu-onsen Fukushima, 2005	U. limnetis 169 x 38 μm Japan, 1998	U. limnetis conjugating pairs Japan, 1998
U. limnetis cysts Japan, 1998	Uroleptus sp. limnetis ? 193 x 33 μm USA, 1999	U. musculus 146 x 44 μm Japan, 1999	Uroleptus ? 104 x 33 μm Kurihashi Saitama, 2001
Uroleptus ? 170 x 26 μm Kurihashi Saitama, 2001	Uroleptus sp. or Psammomitra ? 194 x 28 μm Saitama, 1999	Uroleptus sp. or Psammomitra ? 185 x 28 μm Ushidome-ike Norikura highland Nagano, 2005
Uroleptus ?? or Engelmanniella ? 190 x 20 μm Hiroshima, 1998	Uroleptus sp. with Sphaerophrya 155 x 44 μm Fukasaku-gawa Yusuichi Saitama, 2002

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