An Illustrated and Cross-Referenced Glossary of
Malacological and Conchological Terms

by Paul S. Mikkelsen

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Term Definition

ANTEROLATERAL   Forward, towards the ANTERIOR and also toward the side or LATERAL.

EQUILATERAL   In bivalves, having the anterior and posterior ends of equal size; see also: EQUIVALVE; INEQUILATERAL; SUBEQUILATERAL.

FIN, LATERAL   Fleshy projections on the each side of the mantle of squids.

INEQUILATERAL   In bivalves, having the parts of the shell anterior and posterior to the beaks differing appreciably in length; see: INEQUIVALVE; SUBEQUILATERAL.

LATERAL   Situated at the side of or arising from the side of a structure (in reference to a shell, RADULAR tooth, etc.).

LATERAL HINGE SYSTEM   Hinge structures present in some PRODISSOCONCHS anterior and posterior to the PROVINCULUM.

LATERAL SECTION   More or less raised area on the TEGMENTUM of valves II to VII of a chiton shell, bounded by the posterior edge of the valve and by a line from the midpoint to the ANTEROLATERAL edge; see also: MEDIAN SECTION; POSTERIOR SECTION.

LATERAL TOOTH   In gastropods, those teeth of a RADULA which lie immediately to the side (left and right) of the RACHIDIAN or central tooth and more inward from the MARGINAL TOOH (if present). See also: RADULA FORMULA.

In bivalves, those shelly protuberances on the dorsal margins of the shell, and at some distance from the UMBONES. In Bivalves, at or of the hinge area on either side of the cardinal area, well removed from the BEAKS.

POSTERIOR LATERAL TOOTH   LATERAL TOOTH situated posteriorly to beaks and (in heterodonts) posterior to the LIGAMENT.

PSEUDOLATERAL TOOTH   LATERAL TOOTH, proximal end of which is close to the BEAK.

SUBEQUILATERAL   Applied to bivalve shells which are nearly equal in size; see also: EQUILATERAL; INEQUILATERAL; INEQUIVALVE.

VALVE, LATERAL AREA   [need definition]. In CHITONS, See illustration: Composite Chiton.

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