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:
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).