| Term | Definition |
| ORBICULAR | Circular and flattish; see also: SUBORBICULAR. See other bivalve shapes. | |
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| PLANORBICULAR | See: PLANORBOID. | |
| SUBORBICULAR | Having a shape of a misshapen circle; see also: ORBICULAR. See other bivalve shapes. | |
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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 |
| ORBICULAR | Circular and flattish; see also: SUBORBICULAR. See other bivalve shapes. | |
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| PLANORBICULAR | See: PLANORBOID. | |
| SUBORBICULAR | Having a shape of a misshapen circle; see also: ORBICULAR. See other bivalve shapes. | |
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