Giant Keyhole Limpet, Megathura crenulata

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Updated 11/29/2012

Family Fissurellidae

CALIFORNIA

Megathura crenulata



Goldfish Bowl, Anacapa Is., CA, 25 feet
Rock Quarry, Catalina Is., CA, 25 feet

GIANT KEYHOLE LIMPET

Locally common on rocky reefs. Shell covered by mantle, color variable. Attains 5 inches. Northern California to Baja California.