The largest class of mollusks, including snails and slugs, characterized by a single coiled shell (or no shell) and a muscular foot used for locomotion. They show remarkable diversity in both terrestrial and aquatic environments.
From Greek 'gaster' meaning stomach and 'podos' meaning foot, literally 'stomach-foot.' The name refers to the way these animals appear to crawl on their belly, with their muscular foot serving as both stomach support and locomotion organ.
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