The tusk shells or scaphopods are a class of marine mollusks which vary in size from minute to medium sized. The scientific name of this class is Scaphopoda, meaning "shovel-footed".
These molluscs live on soft substrates offshore (usually not intertidally). Because of this subtidal habitat and the small size of most species, many beachcombers are unfamiliar with them; their shells are usually not nearly as common or as easily visible in the beach drift as the shells of sea snails and clams.
Molecular data suggests that the scaphopods are a sister group to the cephalopods, although higher-level molluscan phylogeny remains somewhat unresolved.
Tusk shells live in the bottom sediment where they feed.
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