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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 |
| LIGAMENT, PRIMARY | Part of ligament, of bivalves, representing original condition of structure, consisting of PERIOSTRACUM and lamellar and fibrous layers, but excluding secondary additions, notably FUSION LAYER. See also: LIGAMENT, (types). | |
| PRIMARY | Of the first order; most dominant or conspicuous; see also: SECONDARY; TERTIARY; QUARTERNARY. | |
| PRIMARY HOMONYM | A name that is identical to another name. The oldest has priority and is termed the senior primary homonym with the younger name being the junior primary homonym. See also: HOMONYM; SECONDARY HOMONYM; HOMONYMY. | |
| RIBLET, PRIMARY | On shell with riblets of different orders of strength, the riblet that appears early in ontogeny and remains longer than those appearing later; see also: RIBLET, SECONDARY. | |
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