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In the aggregating anemone Anthopleura elegantissima , the colour of the anemone is largely dependent on the proportions and identities of the zooxanthellae and zoochlorellae present.
No specialized sense organs are present but sensory cells include nematocytes and chemoreceptors.
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When the longitudinal muscles relax, the pharynx opens and the cilia lining the siphonoglyphs beat, wafting water inwards and refilling the gastrovascular cavity.
Description: These algae may be either zooxanthellae , zoochlorellae or both.