Pectinaria (Cistenides) hyperborea (Malmgren, 1866)

Synonyms:
Cistenides hyperborea Malmgren, 1866
Pectinaria hyperborea Hessle, 1917

Distinguishing characteristics
Dorsal brim smooth.
Notopodial chaetae on 17, uncini on 12 segments.
12-15 paleae with sharp tips on each side.

Species description
Body short, conical, tapering towards the scaphe. Tentacular membrane low, broad, usually not folded and bearing 26-35 points. Dorsal brim smooth. Paleae moderately long, with sharp tips, 12-15 on each side. Notopodial chaetae on 17, uncini on 12 segments. Scaphe with lobed margin in the frontal part, hind part nearly smooth. Anal tongue moderately long, pygidial cirrus very small, wart-like. Tube - slightly curved, conical masonry of sand grains up to 77 mm long and 10 mm wide.

Size
Up to 55 mm.

Color
Alive transparent greyish with red gills.
In alcohol yellowish, often with a reddish-brown coating on flat anterodorsal surface and chaetae of segment 3.

Habitat
In limited depths, to less than 100 m or to more than 200 m in northern Norwegian fjords.

Mobility
Mobile.

Feeding
Surface deposit feeder.

Life cycle

Distribution
Arctic, North Pacific, North Atlantic to Skagerrak, Canadian Atlantic, New England, Alaskan and Canadian Arctic, Siberian Arctic, Bering Sea, Alaskan Pacific, Sea of Okhotsk, Japan, East Greenland, Iceland, the Faeroes, Svalbard, Northern Norway, Barents Sea.