The
gastropod shell is part of the body of a
gastropod or
snail, a kind of
mollusk or
mollusc. The shell is an external skeleton or
exoskeleton, which may serve for muscle attachment, but also for protection from predators, mechanical damage, dehydration, and calcium storage. Some gastropods appear shell-less (
slugs) but may have a remnant within the mantle, or the shell is reduced such that the body cannot be retracted within (
semi-slug). Some snails also possess an operculum that seals the opening of the shell, known as the
aperture, which provides further protection. The study of
mollusc shells is known as
conchology. The biological study of gastropods, and other molluscs in general, is malacology. Shell morphology terms vary by species group. An excellent source for terminology of the gastropod shell is "How to Know the Eastern Land Snails" by John B. Burch now freely available at the Hathi Trust Digital Library.