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Also known as sea shell, shell, animal shell, seashells

right|thumb|Seashells washed up on the beach in Valencia, Spain; nearly all are single valves of [[bivalve mollusks, mostly of Mactra corallina]] right|thumb|Hand-picked molluscan seashells (bivalves and [[gastropods) from the beach at Clacton on Sea in England]] thumb|A group of seashells, mostly bivalves in the family Pholadidae thumb|226x226px|Mixed shells on a beach in Venezuela thumb|Hermit crabs inhabiting marine gastropod shells that lived in the [[Persian Gulf]] thumb|A group of beach-worn sea snail shells that vary in size, form and pattern combination.