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(O.F. Müller, 1771)

Description:
Body long and strong.
5-15 pairs of radioli. Radioli basally fused but not webbed, some with 1-8 eye spots. Peristomium with two eyes. Palps broad at their base, tapering to the tip. Collar with dorsal and ventral clefts and dorsolateral notches. Chaetiger 1 with 2 eyespots.
Thorax with 7-14 chaetigers; thoracic uncini with companion chaetae (P. reniformis-detail). Thoracic notopodial chaetae are long, straight with broad wings at each tip and short spatulate chaetae.
Abdomen with chaetae that are all bent capillaries, with broad wings; uncini similar to those on the thorax.
Pygidium with two papillae and eye spots.

Size:
Up to 120 mm for 300 chaetigers.

Tube:
Horn-like, transparent, often spiralled, quite tough. Usually partly encrusted with mud or sand.

Colour:
Body orange or red; crown white or pink with brown or violet bands or spots.

Habitat:
In crevices in rock or boring in limestone; on various kinds of substrata: shells, Laminaria , sponges or Lithothamnion ; lower shore and sublittoral, down to 600 m.

Distribution:
Widely distributed: Arctic, North Pacific, North Atlantic to Senegal, Mediterranean, northern North Sea to Bay of Kiel, Namibia, South Africa, Madagascar.

Pseudopotamilla reniformis