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(Linnaeus, 1767)

Body stout, anteriorly and posteriorly tapered. Prostomium rounded triangular, about as long as wide. Median antenna situated well in front of eyes, of same size as paired antennae. Eyes medium-sized, occasionally partly covered by segment 1. Proboscis widest distally, covered with diffusely distributed rounded papillae. Terminal ring with 12-30 papillae. Segment 1 with tentacular cirri reaching segment 2-3. Dorsal tentacular cirri of segments 2 and 3 reaching about segment 7. Ventral tentacular cirri reaching about segments 3-4, often thick and slightly flattened. Chaetae usually present from segment 3, in juveniles one or two chaetae may occur on segment 2. Dorsal cirri of median segments lanceolate, 21/4-3 times as long as broad. Parapodial lobes rounded, with varying number of chaetae. Ventral cirri oval, slightly longer than parapodial lobes (E. viridis-parapodium). Pygidial cirri three or four times as long as wide.

Up to 85 mm.

Living animals yellowish green. Large specimens usually darker. Dark spots may be present on dorsal and ventral sides of parapodial bases. Preserved animals dark yellow to brown.

A common intertidal species on rocky shores. May also be found subtidally on rocky bottoms and in shell gravel, to 150 m.

West coasts of Sweden, Denmark, Germany and Norway, The Faeroes, Iceland and Disko Island. Reported from all over the northern hemisphere.

Eulalia viridis