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An Illustrated and Cross-Referenced Glossary of Malacological and Conchological Terms |
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| by Paul S. Mikkelsen | |||
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| Term | Definition |
| MARGIN | [need definition]. | |
| ANTEROVENTRAL MARGIN | In bivalves, the anterior end of the valve margin opposite the hinge; See also: POSTEROVENTRAL MARGIN; | |
| BASAL MARGIN | Edge of shell opposite hinge, in bivalves; = VENTRAL MARGIN. | |
| CARDINAL MARGIN | The edge of a BIVALVE shell on which the HINGE TEETH are located. | |
| COMMARGINAL | [need definition]. | |
| COMMARGINAL RIB | [need definition]; see also: OVERRIDE. | |
| CONMARGINAL | Preferred term by some modern authors for structure with direction coinciding with that of growth lined; = CONCENTRIC, in bivalves. | |
| EMARGINATE | Notched at the MARGIN. | |
| HINGE MARGIN | Edge of bivalve shell that approximates most closely to hinge axis. | |
| INFRAMARGINAL | Situated below a MARGIN. | |
| MARGIN | The free edge, generally of a sculptural element; the edge of the aperture. See: CARDINAL MARGIN; MARGIN, DISCORDANT. | |
| MARGIN, DISCORDANT | With margins of closed valves not in exact juxtaposition, but one overlapping the other; example: Anadara; see also: INEQUIVALVE. | |
| MARGINAL | Located on the margin, or near the edge; see also: TOOTH, MARGINAL"/a>. | |
| MARGINAL CARINA | Ridge in Trigoniacea (Bivalvia) that runs from UMBO to posteroventral angle of shell and delimits posterior area. | |
| MARGINAL TOOTH | Those teeth of a RADULA, which lie to the outside of the LATERAL TEETH; see also: RACHIDIAN; RADULA FORMULA. | |
| MARGINATE | Having an edge or border thicker than the rest of the shell (as in the genus Marginella); see also: EMARGINATE; INCRASSATE. | |
| POSTEROBASAL MARGIN | See: POSTEROVENTRAL MARGIN. | |
| POSTERODORSAL MARGIN | In bivalves, the margin of the DORSAL part of the shell POSTERIOR to the BEAKS. | |
| POSTEROVENTRAL MARGIN | In bivalves, the posterior end of the valve margin opposite the hinge; = POSTEROBASAL MARGIN. See also: ANTEROVENTRAL MARGIN; | |
| SHOULDER MARGIN | The periphery or outermost edge of a WHORL. | |
| SUBMARGIN | One of the dorsal edges of the disk or body of a shell in the Pectinacea, adjoining the lower body of the AURICLE. | |
| VARICAL MARGIN | The free, often sculptured, generally SERRATE or CRENULATE edge of a VARIX. | |
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