| 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. |
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| 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. | |