Family Solenidae - knife and razor clams

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Bivalvia
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Fresh : Yes | Brackish : Yes | Marine : Yes
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Changed Order from Veneroida to Adapedonta (Ref. 3477). Shell equivalve, laterally compressed to subcylindrical in cross-section, with a narrowly elongate, often sword-like or razor-like shape, very inequilateral and gaping at both ends. Umbones not prominent, frequently near the anterior end of dorsal margin. Outside of shell essentially with concentric growth marks, often changing abruptly in direction along a diagonal line running from the umbones to the posteroventral end of valves. Periostracum prominent, frequently glossy. Ligament external, set in an elongate linear groove of posterodorsal margin. Hinge feeble, with at least 1 peg-like cardinal tooth in each valve, and sometimes 1 or 2 lamellar posterior teeth. Interior of shell porcelaneous. Two dorsally placed, anrrowly elongate to rounded, adductor muscle scars, the anterior one commonly larger. Pallial sinus relatively shallow, its ventral, and even sometimes dorsal limb largely confluent with pallial line. Internal margins smooth. Gills of eulamellibranchiate type, posteriorly placed, with smooth or folded branchial sheets. Foot long and narrow, often terminally swollen. Siphons naked, short to long, fused, at least at their base. Mantle margins widely fused ventrally, with an anterior to anteroventral opening. Filter-feeding animals, adapted to swift and deep-burrowing in soft bottoms with their powerful foot, capable of swelling at the end and protruding anteriorly through the narrowly elongate shell. Intertidal species of Solenidae are sometimes actively exploited, notably in the Philippines, Indonesia, and Malaysia (Ref. 348).
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Ref.
[ e.g. 9948]                       
Glossary
                    [ e.g. cephalopods]


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