balanus attached to the shell of a japanese scallop. marine acorns, balanus -crustacean animal

balanus attached shell japanese scallop marine acorns crustacean animal strange animals sea crayfish dry species stone coast closeup ocean calcareous water invertebrate barnacles barnacle background life acorn nonmotile rock shoreline small tide white sessile shore nature litoral aquatic natural beach closed colonise colony ebb fixed fragility granite heap intertidal house relative shrimp