Upper Newport Bay, Newport Beach, Orange County, CA. 04/14/07. Peter J. Bryant.

Ribbed Mussel

Geukensia demissa

Pelecypodia: Mytilidae

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Just north of Newport Aquatic Center, Upper Newport Bay, Newport Beach, Orange County, CA. 9/30/12. © Peter J. Bryant.
 
Distribution in Newport Bay, Newport Beach, Orange County, CA. 2012: Circles, adults <5/cu.ft.