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Family Fimbriidae - basket lucinas
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Class |
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Bivalvia |
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Environment |
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Fresh : No |
Brackish : No |
Marine : Yes |
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Remark |
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Synonym of subfamily Fimbriinae, under family Lucinidae (Ref. 3477). Shell equivalve and subequilateral, inflated, thick, transversely elliptical and not gaping. Umbones prosogyrate, small and rounded about midlength of shell. Lunule lanceolate, small and impressed; escutcheon narrow and depressed, largely occupied by the ligament. Outer surface with latticed sculpture, concentric ribs more prominent. A shallow radial fold running from umbonal area to posteroventral angle of shell margin. Periostracum absent. Ligament marginal, a strong arched band set in a deep groove of posterodorsal margin. Hinge with 2 massive, tubercular cardinal teeth, 1 nearby anterior lateral tooth, and 1 long, remote posterior lateral tooth in each valve. Interior of shell porcelaneous. Two adductor muscle scars, the anterior slightly larger but not projecting postero-ventrally inside the pallial line which is devoid of sinus. Internal margins crenulate. Gills of eulamellibranchiate type, with smooth branchial sheets; outer demibranches absent; inner demibranches united posteriorly to each other and to the mantle. Special mantle gills present beneath the anterior adductor muscle. Foot subtrigonal, heeled posteriorly, pointed anteriorly, laterally compressed and ventrally grooved. Mantle with a broad anteroventral gape, a posteroventral exhalant siphonal tube and a posteroventral rounded inhalant aperture. Pallial margin papillate. Filter-feeding reef dwellers, probably burrowing only shallowly in coralline sand, in shallow water. Sexes separate. Free-swimming larval stage present. locally used as food or raw material for shellcraft and to make lime (Ref. 348). |
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