| Term | Definition |
| SINISTRAL |
In gastropods, the direction of coiling in which, with the shell held upright (apex at the top), the APERTURAL opening is at the left; and in which, with the shell viewed from above the APEX, the coiling proceeds from the apex in a counterclockwise direction; = LEFT HANDED; opposite of DEXTRAL; See also:
ACHIRAL;
CHIRALITY;
HETEROSTROPHY;
ENANTIOMORPH;.
See other gastropod shapes. Illustration: Physella sp.; Photo: Busycon contrarium (Conrad, 1840) See: Sinistral Shells - by design or accident |
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