white dry shells of bivalve mollusks lentidium on the shore in storm throw-ups, kuyalnik estuary, ukraine

lentidium mollusk bivalve shell estuary shore storm throwups kuyalnik ukraine marine fauna dry white sediment beach coastline sand tidal ecosystem habitat saltwater brackish gastropod invertebrate aquatic biodiversity calcite calcium shellfish natural decay biology shoreline waves benthic sedimentology ecology estuarine conservation deposition species