| Term | Definition |
| DISCOIDAL | Round and flat, like a disk.; see also: DEPRESSED; LENTICULAR; PLANISPIRAL; SEMIDISCOIDAL. See other gastropod shapes. | |
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| SEMIDISCOIDAL | Forming half of a circular disk; see also: DISCOIDAL. | |
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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 |
| DISCOIDAL | Round and flat, like a disk.; see also: DEPRESSED; LENTICULAR; PLANISPIRAL; SEMIDISCOIDAL. See other gastropod shapes. | |
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| SEMIDISCOIDAL | Forming half of a circular disk; see also: DISCOIDAL. | |
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