Laguna Beach, Orange County, CA. 08/11/06. © Peter J. Bryant
 

Giant Keyhole Limpet

 

Megathura crenulata

Archaeogastropoda: Fissurrelidae

Native to Southern California to Baja California

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Juvenile? Laguna Beach, Orange County, CA. 08/11/06. © Peter J. Bryant

Laguna Beach, Orange County, CA. 04/23/07. © Peter J. Bryant

Dana Point tidepools, Orange County, CA, 12/31/2017. © Rex Barnard