Home > Invertebrates > Shells > Worm Shells > Thylacodes variabilis

Updated 3/12/2025

Family Vermetidae

CENTRAL PACIFIC / HAWAII

Thylacodes variabilis

Kapoho Point, Kailua, Oahu

 

Makapu'u tidepool, Oahu

Sharks Cove, Oahu, 30 feet

 

Portlock tidepool, Oahu

Sharks Cove, Oahu 40 feet



Ma'alaea Bay, Maui



Sand Island, Oahu, 4 feet



Kikaua, Hawaii, 3 feet


Kikaua, Hawaii, 3 feet



Kuki'o tidepool, Hawaii



Kawaihae, Hawaii



Kahe Point, Oahu, 12 feet



Portlock, Oahu

   

VARIABLE WORM SHELL   KIO PO‘APO‘AI

Common on hard surfaces at any depth.  Brown shell crossed by strong spirals & ribs.  Animal color variable, the only Hawaiian species lacking an operculum.  The shell aperture is extremly sharp and inflict deep puncture wounds to bare feet.  Aperture diameter of 0.3 inch, 8 mm, length of 2 inches, 50 mm.  Occurs in the Hawaiian, Line, and Marshall Islands.  Formerly known as Serpulorbis variabilis.