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

by Paul S. Mikkelsen

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Term Definition

SUBTRIGONAL   Not quite TRIGONAL, but nearly so. See other bivalve shapes.
Photo: Nucula proxima Say, 1822

TRIGONAL   Having three sides and angles; triangular in outline; see also: TRIANGULATE; DELTOID; DONACIFORM. See other bivalve shapes.
Photo: Parastarte triquetra (Conrad, 1846)

TRIGONALLY SUBOVAL   Having features of being triangular and somewhat OVAL in shape. See other bivalve shapes.

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