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What (who) is tusk shell - definition
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.jpeg?width=200 "Shell of ''Calliodentalium semitracheatum'' <small>(Boissevain, 1906)</small> (specimen at MNHN, Paris)")
![Anatomical diagram of ''[[Rhabdus rectius]]''](https://commons.wikimedia.org/wiki/Special:FilePath/Scaphopoda.svg?width=200 "Anatomical diagram of ''[[Rhabdus rectius]]''")
![Centreville High School]]. Behind the orchestra is a simple shell.](https://commons.wikimedia.org/wiki/Special:FilePath/Lake Braddock Symphony Orchestra.JPG?width=200 "Centreville High School]]. Behind the orchestra is a simple shell.")
Wikipedia
 Figure 23.jpg?width=120)
The tusk shells or tooth shells, technically the Scaphopoda (the scaphopods , from Ancient Greek σκᾰ́φης skáphē "boat" and πούς poús "foot"), are members of a class of shelled marine mollusc with worldwide distribution, and are the only class of exclusively infaunal marine molluscs. Shells of species within this class range from about 0.5 to 18 cm (for Fissidentalium metivieri) in length. Members of the order Dentaliida tend to be larger than those of the order Gadilida.
These molluscs live in 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 not as common or as easily visible in the beach drift as the shells of sea snails and clams.
Molecular data suggest that the scaphopods are a sister group to the cephalopods, although higher-level molluscan phylogeny remains unresolved.
