About 5mm shell length. On kelp at Crystal Cove, Orange County, CA. 4/1/14.
© Peter J. Bryant.

Pelagic Goose Barnacle

Lepas anatifera

Cirripedia: Lepadidae

Cosmopolitan but more common in tropical and subtropical seas.

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About 5mm shell length. On kelp at Crystal Cove, Orange County, CA. 4/1/14.
© Peter J. Bryant.

About 5mm shell length. On kelp at Crystal Cove, Orange County, CA. 4/1/14.
© Peter J. Bryant.

On giant kelp washed up at Crystal Cove State Park, Orange County, CA. 4/25/2014. © Timothy Arehart

With predator Fiona nudibranch, Fiona pinnata, on tar-contaminated kelp washed up at Crystal Cove State Park, Orange County, CA. 4/25/2014. © Timothy Arehart