Musculium lacustre is a species of small freshwater clam, an aquatic bivalve mollusc in the family Sphaeriidae, the fingernail clams and pea clams.
The 8–11 mm. shell is oval to quadrangular in shape. The umbos which are capped by the juvenile shell are slightly in front of middle directed forwards. The posterior end is broad and truncated. The shell is fragile, fairly glossy and pearl grey to white in colour. The periostacum (surface) is ornamented with fine, even, concentric striation.
The native distribution of this species is Holarctic and occurs in islands and countries including:
Social animals are those animals that interact highly with other animals, usually of their own species (conspecifics), to the point of having a rec...