Scaphopoda

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Scaphopoda

a class of primitive molluscs, possessing a tube-like shell open at both ends.
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The scaphopods (or "tusk shells") burrow into sea-floor sediment using their muscular "foot" and live head-down.
For instance, in bivalves and scaphopods the cleavage pattern of the 2d cell, the first somatoblast, completely differs from the cleavage pattern of 2d in gastropods and polyplacophores.
Marine molluscs dredged on the continental shelf of Axel Heiberg Island during cruises 85200 and 86200 of the Atlantic Geoscie nce Centre, Natural Resources Canada, Bedford Institute of Oceanography; (B) bivalve, (G) gastropod, (S) scaphopod.
In a scaphopod (Wanninger and Haszprunar, 2003) and in bivalves (Matsutani and Nomura, 1986; Croll et al.
The scaphopod velum has been homologized with the lamellibranch bivalve velum.
Embryos of a polyplacophoran (Acanthochiton) and a scaphopod (Dentalium) showed an expression pattern completely comparable with that in Patella (A.