An Illustrated and Cross-Referenced Glossary of
Malacological and Conchological Terms
|by Paul S. Mikkelsen|
A muscular organ of locomotion, projecting anteriorly through the
APERTURE of shelled GASTROPODS (often for crawling); see also:
In BIVALVES, a organ lying anteroventrally between the VALVES of many bivalves (often for digging).
In SCAPHOPODS, an anterior organ also used for digging; See illustration at UCMP.
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