Background is 1/4 inch squares. Lower Newport Bay, Orange County, CA. 2/10/12. © Peter J. Bryant.
 

Pacific eggcockle

Laevicardium substriatum  

Bivalvia: Cardiidae

Thanks to Paul Valentich-Scott, Santa Barbara Museum of Natural History, for identification

 

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Same group as above, inverted. Background is 1/4 inch squares. Lower Newport Bay, Orange County, CA. 2/10/12. © Peter J. Bryant.
 
Distribution in Newport Bay, Newport Beach, Orange County, CA. 2012. Large circles, >5/cu.ft.; small circles, <5/cu.ft.: