Fissurella volcano Reeve, 1849
Phylum Mollusca, Class Gastropoda, Subcl. Orthogastropoda, Superorder Vetigastropoda, Family Fissurellidae
Keyhole limpet; cap-shaped shell 20-35 mm with elongate oval aperture at apex; shell pink with reddish-brown radiating markings; edge of mantle striped with red & white, foot yellowish.
Common on sides of rocks & under overhangs, mid-intertidal zone on protected outer coasts.
Geo Range: northern California to Baja
Similar species: Diodora aspera is larger, occurs lower on the shore (and subtidally), & has a round rather than oval opening at apex of shell.
Image: tube of Serpulorbis (upper left), Acmaea mitra (rt side, middle)