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(Oersted, 1843)

Description:
Body short, with triannulate segments. Epidermis reticulate with a regtangular pattern. Ventral side without an obvious furrow.
Prostomium small and bilobed, with 2 long, dorsolatteral nuchal slits. Eyes absent.
Noto- and neuropodia simple mounds, each with a bundle of capillary and forked chaetae. Dorsal and ventral cirri absent.
Four to six pairs of arborescent gills, starting at notopodium 2.
Pygidium short, cylindrical.

Size:
Up to 40 mm for 40 segments, when contracted; twice as long when extended.

Colour:
In alcohol yellow to colourless.

Habitat:
On mud and mixed bottoms, from the upper sublittoral to over 2000 m. It lives in U-shaped burrows which are supported by slimy secretions.

Distribution:
Arctic, North Atlantic to Mediterranean, North Sea to Öresund, South Africa.

Polyphysia crassa