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Family Solecurtidae - short razor clams
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Order |
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Class |
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Bivalvia |
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No. of Genera in Ref. |
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No. of Species in Ref. |
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Environment |
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Fresh : No |
Brackish : No |
Marine : Yes |
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First Fossil Record |
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Remark |
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Changed Order from Veneroida to Cardiida (Ref. 3477). Shell equivalve, elongate-quadrate in outline, widely gaping at both ends, slightly inequilateral. Umbones not prominent, subcentral to more or less anterior. Outside of shell smoothish or with a low sculpture, mainly concentric or oblique. Periostracum well developed. Ligament external and prominent, attached behind umbones on projecting nymphs. Hinge plate rather weak, usually with 2, more or less pedunculated, cardinal teeth in either valve. Interior of shell porcelaneous. Two adductor muscle scars, unequal in shape. Pallial sinus deep. Cruciform muscle scars obscure. Internal margins smooth. Gills of eulamellibranchiate type, with folded branchial sheets; outer demibranch somewhat shortened and expanded over the ctenidial axis. Foot tongue-shaped. Siphons naked, long, and separate to their base, with 6 lobes or tentacles at the end. Cruciform muscles, when present, somewhat anteriorly displaced. Mantle margins fused ventrally, with a rather reduced anteroventral opening. Suspension or deposit feeding animals, actively burrowing in soft bottoms with their powerful foot. Sexes separate. Free-swimming larval stage present. Generally collected for subsistence by coastal populations in the area. However, a single species is of economic importance in Thailand (Ref. 348). |
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Main Ref. |
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