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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 |
| ANTEROVENTRAL | Being both forward and downward; toward the front and lower regions; see also: POSTEROVENTRAL. | |
| ANTEROVENTRAL MARGIN | In bivalves, the anterior end of the valve margin opposite the hinge; See also: POSTEROVENTRAL MARGIN; | |
| POSTEROVENTRAL | Being both rearward and downward; toward the rear and lower regions; see also: ANTEROVENTRAL. | |
| POSTEROVENTRAL MARGIN | In bivalves, the posterior end of the valve margin opposite the hinge; = POSTEROBASAL MARGIN. See also: ANTEROVENTRAL MARGIN; | |
| VENTRAL | Of, pertaining to, or situated on the lower side in a dorsoventral organism; on the apertural surface of a gastropod shell; at or toward that part of the bivalve shell opposite the HINGE; see also: DECURRENT; DORSAL. | |
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