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An Illustrated and Cross-Referenced Glossary of Malacological and Conchological Terms |
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| by Paul S. Mikkelsen | |||
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| Term | Definition |
| HOLLOW SPINE | A stiff, sharp, sculptural structure, the interior of which is not filled with shell matter. see also: HYOTE SPINE. | |
| HYOTE SPINE | Hollow, tubular, and cylindrical shell outgrowths open distally at their tips as well as on their distal flanks, arising periodically from the thin edges of shell margins of OYSTERS [the tip ends are rounded, ear-shaped openings, typically developed on Hyotissa hyotis (Linne, 1758)]. | |
| SHOULDER SPINE | A spine at or above the SHOULDER margin. | |
| SPINE | A more or less slender and elongate projection of a shell, either tapering to a point or spreading out distally into fronds or FOLIATIONS. See illustration: Composite Gastropod and Composite Bivalve. See also: SPINELET; SPLIT SPINE. | |
| SPINE-TUBE | A tapering SPINE having a hollow interior. | |
| SPLIT SPINE | A SPINE with incurled, but not fused margins. | |
| VARICAL SPINE | A sharp projection arising from a VARIX. | |
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