Seanet Low Intertidal

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Calliostoma ligatum (Gould, 1849)
Phylum Mollusca, Class Gastropoda, Subcl. Orthogastropoda, Superorder Vetigastropoda, Family Trochidae

Conical, rounded shell to 25 mm, dark brown with narrow tan or dark blue spiral lines.  Head & foot black. Coats shell with thin layer of slippery mucus using posterior end of foot.

Common on rocks, red algae, low intertidal zone to subtidal. Omnivorous, but generally browses on sponges, bryozoans, compound ascidians, hydroids & other sessile invertebrates rather than algae.

Geo Range: Alaska to San Diego
Similar species: three other species of Calliostoma live subtidally & are sometimes encountered in the low intertidal zone.