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(Fabricius, 1780)

Description:
Body anteriorly slightly flattened, posteriorly pointed.
Prostomium broadly rounded, with two small eyes at the posterior margin.
Thorax with 11-17 chaetigers. Thoracic notopodia with a single postchaetal lobe, a bundle of capillary chaetae and a few forked chaetae. Thoracic neuropodia with a postchaetal lobe with a single triangular projection.
Abdominal notopodia as thoracic notopodia. Abdominal neuropodia bilobed, with few chaetae and few protruding aciculae.
Gills start at chaetiger 4-6 (N. quadricuspida-detail).
Pygidium with four lobes and four short cirri.

Size:
Up to 80 mm for 130 segments.

Colour:
Yellowish, pale pink or flesh-coloured, with red gills.

Habitat:
Generally in low water between seaweeds and rocks. Also on soft bottoms between shells and stones.

Distribution:
Arctic, North Pacific, North Atlantic to the northern North Sea and Skagerrak.

Naineris quadricuspida