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(Audouin & Milne-Edwards, 1834)

Description:
Prostomium rounded triangular, about 1.5 times wider than long. Median antenna situated well in front of eyes. Proboscis widest distally, covered with diffusely distributed conical 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 present from segment 3. Dorsal cirri of median segments lanceolate, 1.75-2.25 times as long as broad. Ventral cirri oval (E. clavigera-parapodium). Pygidial cirri two or three times as long as wide (E. clavigera-detail).

Size:
Up to 94 mm.

Colour:
Living animals deep emerald green. Dark spots may be present on the ventral sides of parapodial bases.

Habitat:
On hard substrata in shallow water.

Distribution:
As yet only reported from France and Great Britain.

Eulalia clavigera