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Aggregating anemone
''Anthopleura elegantissima'', also known as the aggregating anemone or clonal anemone, is the most abundant species of sea anemone found on rocky, tide swept shores along the Pacific coast of North America.〔Kozloff, Eugene N.. Marine Invertebrates of the Pacific Northwest. 2nd. Seattle: University of Washington Press, 1996.〕 This cnidarian hosts endosymbiotic algae called zooxanthellae that contribute substantially to primary productivity in the intertidal zone.〔Fitt, W. K., R. L. Pardy, AND M. M. Luttker. 1982. Photosynthesis, respiration, and contribution to community productivity of the symbiotic sea anemone Anthopleura elegantissima. J. Exp. Mar. Biol. Ecol. 61: 213–232.〕 ''A. elegantissima'' has become a model organism for the study of temperate cnidarian-algal symbioses.
==Description==
The polyps of ''Anthopleura elegantissima'' reach up to eight cm across the oral disk with approximately 100 tentacles in three or four rows around the margins of the oral disk. Most are olive to bright green (depending on the species of algal symbionts present) with tentacles tipped in pink. Individuals that live in microhabitats that are deficient in photosynthetically active radiation (PAR), such as under docks or in caves, lack symbionts and are pale yellow to white in color.〔Secord D, Muller-Parker G (2005) Symbiont distribution along a light gradient within an intertidal cave. Limnology and Oceanography 50: 272-278〕
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