Highest high tide Supralittoral Lowest high tide High tide zone (backshore Highest low tide Middle tide zone Ghost shrimp Beach hopper Lowest low tide Low tide zone Ghost crab Bristle worm Sublittoral zone Clam Sand crab Lugwomm Sand dollar Sand star Heart urchin Ice cream Sea cucumber cone worm Horseshoe crab Intertidal zonation of the sediment-covered shoreShanghai Jiao Tong University Intertidal zonation of the sediment-covered shore