When the tide is out, the bivalve Geukensia granosissima family Mytilidae shuts is valves tight and waits for the return of the water1.    From Wordnik.com.  [Waiting for the next tide] Reference

An Annoted Bibliography of New Zealand Marine Mussels (Mytilidae) 1880-1982.    From Wordnik.com.  [4 Coastal Mariculture] Reference