shells of barnacles balanus sp. on concrete piles of a bridge near the shore

acorn animal aquatic arthropoda arthropods balanidae balanoidea balanus barnacle benthos bentos black sea cancer claws close closeup crab crawfish crayfish crustacea crustacean crustaceans decapoda ecological ecology environment fauna flora invading invasion invasive invertebrate invertebrates life malacostraca marine mediterranean mollusk nature organisms saltwater sessile shell shrimp water world wild wildlife