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The name comes from the numerous flattened cerata that gives it a shaggy appearance. There is a triangle shaped bare spot near the rhinophores to the cerata. Subdued color can be from vary depending on the sea anemone it is feeding on.
Spotted in an intertidal pool
This is a species of Nudibranch " a group of soft-bodied, marine gastropod mollusks which shed their shell after their larval stage" Sometimes called Sea Slugs but most Sea Slugs come from a different family. There are two types of nudibranchs, the dorid which breathe through gills on their back end and Eolid have the soft bristle looking appendages called cerata. What looks antennae are actually called rhinophores which are taste receptors.The tenacles further in front are the oral tentacles that mainly help them find their way. The eyes of Nudibranches are deep set and can only tell light from dark. They feed on sponges, coral, anemones, hydroids, barnacles, fish eggs, sea slugs, and other nudibranchs. Some have restricted diets. They can get their bright colors on species they feed on which give them warning colors to predators. Their defense is a toxin that Eolids get from their prey and Dorids make their own. Most are harmless to humans.