Home > Invertebrates > Shells > Horns > Cerithium egenum

Updated 10/15/2025

Family Cerithiidae

INDO-PACIFIC / HAWAII

Cerithium egenum



Makapu'u tidepool, Oahu, 11 mm


Kawaihae, Hawaii
   

TURRETED HORN

Common on algal mat of shallow reefs and tidepools.  Turreted-angular with fine granular spirals, and one coarse spiral of conical nodules, dark area on posterior body whorl.  Attains 0.5 inch, 12 mm.  Red Sea to Japan, Hawaii, and the Tuamotus, introduced to the Mediterranean.  Occurs with and more slender than Cerithium atromarginatum.