Home > Invertebrates > Shells > Moon Snails > Polinices mammilla

Updated 8/26/2025

Family Naticidae

INDO-WEST PACIFIC / HAWAII

Polinices mammilla



Waimanalo, Oahu, 10 feet

PEAR-SHAPED or WHITE MOON SNAIL

Uncommon in sand at any depth.  Shell relatively light, umbilicus filled, operculum transparent brown.  An extended animal is much larger than the shell.  Attains 2.7 inches, 68 mm.  Red Sea to Japan, Hawaii, and the Tuamotus.  Formerly known as Polinices tumidus.