Thorny oyster on reef, Vava'u Tonga

adult adults alone aquatic species barrier reef barrier reefs benthons bivalve / lamellibranche bivalves / lamellibranches continent continental area coral reef coral reefs coralreef coralreefs count counting description descriptions ecosystem ecosystems enumeration enumerations image and subject individual individuals landmass landmasses littoral (shore) littorals (shore) localisation localization location lone lonely marine and coastal wetland area marine and coastal wetland areas marine and coastal wetland zone marine and coastal wetland zones marine species mollusk mollusks month of year months of year natural area natural areas nature new world ocean oceania oceans one one animal only pacific ocean photos under the water recording recordings reef saltwater species salt water species sea sea and coastal water sea bottom sea bottoms sea water seas seen under the water september shoting shotings single solo south pacific ocean species species characteristic species characteristics species particularities species particularity stage of development subaquatic image subaquatic photos subaquatic sights submarine images submarine photo submarine photographies submarine photography submarine photos submarine sight submarine sights thorny oyster (spondylus varius) three quarter length three quarter shot three quarter shots three quarter sight three quarter sights three quarter view three quarter views time scale time scales tonga tropical ocean tropical oceans tropical sea tropical seas underwater underwater shot underwater shots underwater view underwater views underwaterphoto underwaterphotographies underwaterphotography underwaterphotos underwaterpicture underwaterpictures wild animal wild animals wild fauna wild faunae world sea and ocean world seas and oceans