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(M. Sars, 1861)

Description:
Body cylindrical with 19 chaetigers. The first segments are relatively short, but mostly longer than broad.
Prostomium rounded, rim with a notched margin. Nuchal slits semicircular.
The seven most anterior segments are bi-annular and as long as prostomium-peristomium. The following segments are much longer than broad, posterior ones again short.
First chaetiger enlarged into a collar.
Notopodial chaetae are capillaries, on anterior segments they are winged and with long tips; on posterior segments also feathery chaetae present. Hooks present on neuropodia starting on 2nd chaetiger. 1 or 2 posterior segments without chaetae (C. biceps-detail).
The three anterior segments with a complete glandular band, the 5 next ones with ventral glandular areas, the rest with glands on neuropodia.
Pygidium with oval to rounded anal plate, with deep incisions.

Size:
Up to 180 mm for 19 chaetigers.

Tube:
Cylindrical and thin. Diameter outside 4-4.5 mm, inside about 2 mm.

Colour:
Anterior irregularly dark-brown pigmentation. Posterior paler. In alcohol yellowish with whitish glandular bands.

Habitat:
In mud, sometimes in mixed bottoms with sand and shells. The vertical distribution extends from the upper sublittoral, 45 m down to 1000 m deep.

Distribution:
Arctic, North Pacific, North Atlantic up to Mediterranean and Adriatic, Northern and middle North Sea, Skagerrak, Kattegat, possibly to eastern Baltic Sea.

Chirimia biceps