San Onofre State Beach, San Diego County, CA. 01/12/13. © Robert Gorman.

Rough Piddock

Zirfaea pilbryi

Bivalvia: Pholadidae

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Laguna Beach, Orange County, CA. 01/14/07. © Peter J. Bryant.

San Onofre State Beach, San Diego County, CA. 01/12/13. © Robert Gorman.

San Onofre State Beach, San Diego County, CA. 01/12/13. © Robert Gorman.

San Onofre State Beach, San Diego County, CA. 01/12/13. © Robert Gorman.

Siphons. San Onofre State Beach, San Diego County, CA. 01/12/13. © Robert Gorman.

San Onofre State Beach, San Diego County, CA. 01/12/13. © Robert Gorman.

Neck and siphons. San Onofre State Beach, San Diego County, CA. 01/22/13. © Peter J. Bryant.

Siphons. San Onofre State Beach, San Diego County, CA. 01/12/13. © Robert Gorman.

Inside burrow in rock at San Onofre State Beach, San Diego County, CA. 01/22/13. © Peter J. Bryant.

San Onofre State Beach, San Diego County, CA. 01/22/13. © Peter J. Bryant.

San Onofre State Beach, San Diego County, CA. 01/22/13. © Peter J. Bryant.

Protruding from the burrow. San Onofre State Beach, San Diego County, CA. 01/22/13. © Peter J. Bryant.

Rough foot end of the shell, used as grinding plates to enlarge the burrow as the piddock grows. San Onofre State Beach, San Diego County, CA. 01/22/13. © Peter J. Bryant.

Siphons protrude from the neck end of the shell (left) and the foot protrudes from the other (right). Neither end can be completely closed. San Onofre State Beach, San Diego County, CA. 01/22/13. © Peter J. Bryant.

Each valve of the shell is divided into a relatively smooth neck end (left) and a foot end (right) carrying rows of teeth that are used in a rocking motion to grind the inside of the rock burrow. San Onofre State Beach, San Diego County, CA. 01/22/13. © Peter J. Bryant.

Siphons. San Onofre State Beach, San Diego County, CA. 01/22/13. © Peter J. Bryant.

Incurrent siphon. San Onofre State Beach, San Diego County, CA. 01/22/13. © Peter J. Bryant.

Siphons. San Onofre State Beach, San Diego County, CA. 01/22/13. © Peter J. Bryant.

Siphons. San Onofre State Beach, San Diego County, CA. 01/22/13. © Peter J. Bryant.