(Malmgren, 1866)
Description:
Body long and thick.
Tentacles numerous, long.
Gills distinctly dichotomous with long tips and round stems.
Distinct lateral lobes on segments 2 and 3.
Thirteen ventral shields on the thorax.
Twenty-one thoracic segments with subdistally denticulate capillary chaetae on the notopodia. Uncini in double rows on segments 11-24.
Pygidium unknown.
Size:
Up to 250 mm for 140 segments.
Tube:
A thin layer of secretion encrusted with a thick layer of clay.
Colour:
In alcohol yellowish.
Habitat:
On mud and clay, sometimes mixed with fine sand; 20 to nearly 500 m.
Distribution:
Arctic, Japan Sea. Norwegian coast from Tromsø to Oslofjord, Skagerrak, Swedish west coast.