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Pictorial guide to the animal groups
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adults algae animals appear approx areas arms Atlantic attached Biology bivalves body bottoms branches British Isles brown central characteristic cm in length coast colonies colour common confused coral covered crab dark deep deeper Description develop diameter distinguished Distribution dorsal fin eggs Europe European extending eyes Feeds females fish further genus gills Habitat hard head highly hydroids individuals kelp lack larger larvae lateral legs length less live males marine Mediterranean metres depth mid-Norway mouth northern Norway Norwegian observed occurs opening orange organisms pair patches pelagic photographed plates polyps Prefers reach recorded reefs relatively sand seen segments shallow water shape shell shore short side similar snails soft Spawning species specimens spines sponges stones stripes surface tail takes tentacles tube usually various whereas Widely yellow