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The common periwinkle or winkle (Littorina littorea) is a species of small edible whelk or sea snail, a marine gastropod mollusc that has gills and an operculum, and is classified within the family Littorinidae, the periwinkles.
A snail is a shelled gastropod. The name is most often applied to land snails, terrestrial pulmonate gastropod molluscs. However, the common name snail is also used for most of the members of the molluscan class Gastropoda that have a coiled shell that is large enough for the animal to retract
Naticidae, common name moon snails or necklace shells, is a family of medium to large-sized predatory sea snails, marine gastropod molluscs in the clade Littorinimorpha. The shells of the species in this family are mostly globular in shape.
Polymita picta, also known as the Cuban painted snail, or the oriente tree snail, is a species of large, air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Helminthoglyptidae. [2] It is the type species of the genus Polymita, and is endemic to Eastern Cuba.
A species of sea snail in its natural habitat: two individuals of the wentletrap Epidendrium billeeanum with a mass of egg capsules in situ on their food source, a red cup coral. A sea snail Euthria cornea laying eggs. Sea snails are slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone.
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Turbinidae have a strong, thick calcareous operculum readily distinguishing them from the somewhat similar Trochidae or top snails, which have a corneous operculum. This strong operculum serves as a passive defensive structure against predators that try to enter by way of the aperture or that would break the shell at the outer lip.