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An Illustrated and Cross-Referenced Glossary of Malacological and Conchological Terms |
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| by Paul S. Mikkelsen | |||
| Term | Definition |
| HINGE | Collective term for structures of dorsal region of bivalves, consisting of the teeth and ligament, whose function is to facilitate the opening and closing of valves; see also: ACTINODONT; ANODONT; ASTHENODONT; CRYPTODONT; CTENODONT; CYCLODONT; DIAGENODONT; DYSODONT; HETERODONT; ISODONT; ORTHODONT; PANTODONT; PACHYODONT; PRIONODONT; PSEUDOCTENODONT; PSEUDOTAXODONT; SCHIZODONT; TAXODONT; TELEODONT; ...as well as: ACLINE; ARTICOID TYPE; CORBICULOID TYPE; LUCINOID TYPE; ORTHOCLINE; VINCULUM. | |
| HINGE AXIS | Imaginary straight line along which 2 valves of a shell are hinged; = CARDINAL AXIS; see also: HINGE LINE. | |
| HINGE EAR | In bivalves, an anterior and/or posterior expansion of the VALVE in the hinge area; = AURICLE. | |
| HINGE LINE | In bivalves, the region along which the VALVES are attached to each other. Term applied loosely by many authors to part of bivalve shell bordering dorsal margins and occupied by or close to hinge teeth and ligament; used by some in same sense as HINGE AXIS. | |
| HINGE MARGIN | Edge of bivalve shell that approximates most closely to hinge axis. | |
| HINGE PLATE | In bivalves, the dorsal margin carrying the hinge teeth; = CARDINAL PLATFORM. A shelly, internal platform, bearing hinge teeth, situated below the beak and adjacent parts of dorsal margins, and lying in plane parallel to that of the commissure. See illustration: Composite Bivalve. | |
| HINGE TOOTH | Shelly STRUCTURE in bivalves (usually on of a series) adjacent to dorsal margin and received in socket in opposite VALVE; hinge teeth serve to hold valves in position when closed. | |
| HINGE TOOTH SOCKET | The indentation, in a bivalve shell, which accepts the protruding HINGE TOOTH when the valves are closed. See illustration: Composite Bivalve. | |
| HINGE TOOTH | See: HINGE TOOTH. | |
| HINGE, TRANSPOSED | Condition in which certain hinge teeth present in one valve occupy positions of teeth usually found in the other (= TRANSPOSED HINGE TOOTH). See: Van der Schalie, H. 1936. Transposed hinge teeth of North American naiades. Nautilus 49(3):79-84. | |
| LATERAL HINGE SYSTEM | Hinge structures present in some PRODISSOCONCHS anterior and posterior to the PROVINCULUM. | |
| TRANSPOSED HINGE TOOTH |
[need definition]. See: TRANSPOSED HINGE. See: Van der Schalie, H. 1936. Transposed hinge teeth of North American naiades. Nautilus 49(3):79-84. |
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