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.
Head down in the Paleozoic sea; this may be how one clam-like mollusc made its living 400 million years ago
Potential trace-makers proposed for Protovirgularia include crabs (Gumbel, 1879), annelids or arthropods (Richter, 1941; Volk, 1961; Claus, 1965; Greiner, 1972), scaphopods (Seilacher and Seilacher, 1994), and bivalves (e.g., Hakes, 1977; Han and Pickerill, 1994; Seilacher and Seilacher, 1994, Mangano et al., 1998).
Trace fossils from the Mahantango formation (upper middle Devonian) Pike County, Pennsylvania
Description of Tertiary Mollusks (Additions to gastropods, scaphopods, pelecypods: Nuculidae to Malleidae).- USGS Prof.
Dos fosiles notables de la formacion Punta Carballo
rugosa was found inside shells of the scaphopods Fissidentalium megathyris and Rhabdus dalli, surrounded by mud.
Deep-water polychaetes (Annelida) from the southeastern Gulf of California, Mexico
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.
Cleavage patterns and mesentoblast formation in the Gastropoda: an evolutionary perspective
Marine molluscs, including bivalves, gastropods and scaphopods, were recovered by dredging at depths of 3-82 m in Expedition Fiord, Axel Heiberg Island, Canada.
Marine mollusca from Expedition Fijord, Western Axel Heiberg Island, Northwest Territories, Canada

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