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

by Paul S. Mikkelsen

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Term Definition

DEXTRAL   Turning clock-wise or to the right, or "right-handed" in gastropods; the direction of coiling in which, with the shell held upright (apex at the top), the aperture is at the right; and in which, with the shell viewed from above the apex, the coiling proceeds from the apex in clockwise direction; = RIGHT HANDED.; opposite of SINISTRAL; See also: CHIRALITY; ENANTIOMORPH; HETEROSTROPHY; ULTRADEXTRAL.
See other gastropod shapes.

ULTRADEXTRAL   Having seemingly SINISTRAL shell coiling; having the soft parts DEXTRAL, but with the shell WHORLS being added above instead of below the periphery; HYPERSTROPHIC.

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