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Scaphopoda
From LoveToKnow 1911
SCAPHOPODA, the third of the five classes into which the Phylum Mollusca is divided.' The Scaphopoda are marine Molluscs with the body, especially the foot, adapted to a burrowing life in sand.
Scaphopods, also known as tusk shells, have a long cylindrical shell that narrows towards the tip and is open at both ends.
Class Scaphopoda
This small class of marine mollusks includes 200 species of burrowing animals commonly known as the tusk, or tooth, shells. The shell is long, cylindrical and tooth- or tusk-shaped, and open at both ends.
Cephalopods are mollusks and therefore are related to bivalves (scallops, oysters, clams), gastropods (snails and slugs), scaphopoda (tusk shells), and polyplacophorans (chitons).
[54] However genetic studies suggest that they are more basal, forming a sister group to the scaphopoda but otherwise basal to all other major mollusc classes.
 See also: Diver, Shell, Gastropod, Mollusca, Cephalopod
  
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