Opistomum pallidumOpistomum pallidum is a species of rhabdocoel flatworm in the family Typhloplanidae.DescriptionThe animal is 2 to 4.5 mm long. It possesses no eyes. The pharynx is caudally oriented and situated near the posterior end of the body.TaxonomyThe species was described by Eduard Oscar Schmidt in 1848.Distribution and habitatIt is known from Europe and Virginia. It inhabits freshwater habitats, but is absent from streams and rivers.Ecology and behaviorThe species is found in Autumn, Winter and Spring. It is known to feed on naidid oligochaetes.