shells of the bivalve mollusk (mya arenaria) washed ashore in the tidal zone of the sea in the lower reaches

animal aquatic bivalve bivalves black sea conch ecological ecology europe fauna invertebrate landscape marine mediterranean mollusk nature organisms saltwater seaside shell shellfish undersea water world wild wildlife zoology longneck clam tideland coast coastline softshell mudflats wadden seafloor intertidal zone tidewater myidae seashore seashell mollusc calcium species closeup mya arenaria white