Genus (Perty, 1849): Oral cavity large, over most of ventrum; oral cilia as 1 long polykinetid (Illustrated Guide, 1985). Oval; dorsal side convex, ventral side concave; cytostome 3/4 to 4/5 the body length; on its left with a large membrane composed of may ciliary rows; contractile vacuole in mid-dorsal region; macronucleus ellipsoid, subterminal; a micronuleus; caudal cilia (Kudo, 1966).
C/C = cytostome (μm) / cell body (μm)

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L. bullinum ? 150 x 81 μm Tane-ike Togakushi highland Nagano, 2006	L. bullinum ? 129 x μm Kannon-numa 10 Shimogo Fukushima, 2008	L. bullinum 115 x 61 μm Akebono marsh Tsuchiyu-onsen Fukushima, 2005	L. bullinum 110 x 55 μm C/C= 1.0 Saitama, 1999
L. bullinum ? 105 x 63 μm C/C= 0.8 near Karakemi m. Omachi Nagano, 2005	L. bullinum ? 101 x 47 μm C/C= 0.8 Kannon-numa Shimogo Fukushima, 2005	L. bullinum 90 x 47 μm C/C= 0.94 Japan, 1998 Movies	L. bullinum 92 x 44 μm C/C= 1.0 Saitama, 1999
L. lucens 96 x μm C/C= Kannon-numa 2 Shimogo Fukushima, 2008	L. lucens 62 x 33 μm C/C= 0.7 Futayo-no-ike Haguro mountain Yamagata, 2005	L. lucens, x 400 60 x 35 μm C/C= 0.70 & isolated Mac. Japan, 1998	L. lucens 58 x 32 μm C/C= 0.72 Japan, 1998
L. lucens 56 x 32 μm C/C= 0.75 Japan, 1998	L. lucens 54 x 28 μm C/C= 0.81 cell division Japan, 1998	L. lucens 60 x 30 μm C/C= 0.80 Japan, 1998	L. lucens cell μm Japan, 1998
L. lucens cell μm Japan, 1998	L. lucens μm Senjo-ga-hara Nikko Tochigi, 2003	L. lucens 57 x 31 μm Numa-no-hara m. Madarao highland Niigata, 2005

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