Giant Green Anemone, (Anthopleura xanthogrammica).
These relatives of jellyfish can be found along the west coast of the U.S. from Alaska all the way to Baja, Mexico. I photographed this one in the cool waters off Santa Barbara Island at a dive site called Shag Rock. These anemones catch the eye from far away but it is close up that they really put on a colorful show. You would be hard to find this neon green color elsewhere in nature. Just another reason to pay a few more visits to the ocean, even if you aren't in the tropics.
I believe this is a sunburst anemone (Anthopleura sola), because of the radial stripes.
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