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(Stimpson, 1854)

Description:
Body small, cylindrical, with up to 50 chaetigers; seven thoracic chaetigers.
5-7 pairs of radioli. No eyes on peristomium.
Operculum with a flat or concave distal plate and a cup-shaped ampulla below; peduncle long, bare and cylindrical, arises between the first and second radioli of either right or left side.
Collar with lateral and dorsal incisions. Thoracic membrane short, with dorso-lateral margins reaching only as far as segment 2.
Collar chaetae of two types, capillary and geniculate, the latter with a toothed fin distally and with some round teeth on the basal part. Apomatus-chaetae starting at chaetiger 3. Abdomical neuropodial chaetae are geniculate with strong teeth on the distal part.
Thoracic uncini with a single row of teeth, in abdomen uncini with 3-4 longitunival rows of teeth (C. serrula-chaetae).

Size:
Up to 20 mm long for over 50 segments.

Tube:
White and smooth with triangular cross section. With an irregularly toothed medial keel; breeding specimens develop a calcareous brood-chamber on each side of aperture.

Colour:
In alcohol yellowish.

Habitat:
On stones and shells; lower shore and sublittoral. 1-300m depth.

Distribution:
Northern species widespread in the North Atlantic and parts of the North Sea; Skagerrak, Kattegat and Öresund.

Remark:
Tubes of non-brooding specimens are easily confused with young Pomatoceros.

Chitinopoma serrula