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From Wikipedia: "Megathura crenulata, common name the great keyhole limpet or giant keyhole limpet, is a northeast Pacific species of limpet in the family Fissurellidae. Megathura is a monotypic genus, in other words, this is the only species in that genus."
Lat: 33.34, Long: -118.33
Spotted on May 3, 2015
Submitted on May 3, 2015