The siphons (on the left, partly obscured by algal growth) cannot be completely withdrawn into the shell. |
Pacific Gaper Clam Tresus nuttallii Discovered by Robert Gorman at San Clemente State Beach, Orange County, CA. 1/28/13. © Peter J. Bryant.Bivalvia: Mactridae Back to Molluscs of Southern California |
Background is 1/4 inch squares. |
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