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Fieldtrip to Crystal Cove State Park, Orange Co., CA, April 19, 2013

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Zonaria farlowii is a brown alga belonging to Dictyotales (compare with Fucales and Laminariales). The Dictyotales have a worldwide distribution at mostly tropical latitudes.
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Thermiste pyroides (Sipuncula)
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The chiton on upper left is a Lepidozona pectinulata.
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Tidepool ghost shrimp, Neotrypaea biffari (formerly Callianassa affinis)
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Plocamium cartilagineum subsp. pacificum (formerly P. pacificum). P. cartilagineum has a cosmopolitan distribution on temperate shores. For more information, see: 1, 2, and 3
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It is quite unusual to see an ochre seastar (Pisaster ochraceus) with six arms, not five.
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Okenia rosacea (formerly Hopkinsia rosacea) is also known as Hopkins' rose. In 1949 (Biological Bulletin 97:206-209), Harold H. Strain dissolved the pink pigmentation into ethanol or methanol and observed some of its properties. He named this xanthophyll carotenoid pigment as hopkinsiaxanthin, at that time not known from any other organism. Later, James W. McBeth from Scripps further characterized hopkinsiaxathin as an acetylenic apo-carotenoid (Comparative Biochemistry and Physiology Part B: Comparative Biochemistry 41: 6977). Earlier he had shown (1971; The Veliger, 14, 158-161) that there was identical pigment in the nudibranch's primary food item, the bryozoan Eurystomella bilabiata (see Gordon et al., 2002; Zoological Journal of the Linnean Society 136: 199-216, for recently proposed name change of this bryozoan to Integripelta bilabiata). See here.
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The hermit crab, Pagurus samuelis in an unusually pink Chlorostoma aureotincta shell
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