Genus: Ventral side with a hyaline border, reaching posterior end and bearing trichocysts; dorsal side with either similar trichocyst-border or with trichocyst-warts (Kudo, 1966). Species: Cell body 130-160 μm long (Kahl, 1930).

50 μm 100 μm 150 μm; x 400

31 μm 63 μm 94 μm; x 640

* L. niemeccense (Stein, 1859) Kahl, 1931 (Syn. Opithsodon niemeccense Stein, 1859): Very broad, 130-160 μm long; almost ovoid in shape with central upper surface domed; a flattened band with trichocysts around entire periphery of the cell; two spherical macronuclei; a single contractile vacuole (Carey, 1992).

L. rostratum Cohn, 1866: 100-180 μm long; well-defined neck region anterior; posteriorly rounded; ventral edge sinuous; a flattened band along both sides; two ovoid macronuclei; a single contractile vacuole posterior (Carey, 1992).