Scaphopoda

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Scaphopoda

[skə′fäp·əd·ə]
(invertebrate zoology)
A class of the phylum Mollusca in which the soft body fits the external, curved and tapering, nonchambered, aragonitic shell which is open at both ends.
References in periodicals archive ?
On a recueilli des mollusques marins -- comprenant des bivalves, des gasteropodes et des scaphopodes -- par dragages effectues a des profondeurs allant de 3 a 82 m dans le fjord Expedition, situe dans l'ile Axel Heiberg au Canada.
2000)), and in scaphopods it was expressed at the trochophore stage in cells located close to the edge of the mantle (Wanninger & Haszprunar 2001).
Although some scaphopods, bivalves, and gastropods extrude a polar lobe during early cleavages, opisthobranchs do not.
Aplacophorans, monoplacophorans, polyplacophorans, scaphopods: the lesser classes.
Test-like structures are also found among trochophore larvae of scaphopods, described as having an apical tuft and three or six ciliary bands (Lacaze-Duthiers, 1856; Geilenkirchen et al., 1970; Guerrier et al., 1978; Wanninger and Haszprunar, 2001).