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Allen, 1904

Body slender, cylindrical, slightly flattened posteriorly and covered by papillae.
Prostomium, round and smal, with a single frontal antenna, two dorsal and two ventral eyes and nuchal organs as three separate, long processes; the lateral ones reaching segment 4, the median one reaching segment 7. Paired grooved palps present.
First segment with anteriorly directed parapodia bearing a reduced notopodial postchaetal lobe and a big cirriform neuropodial postchaetal lobe and very long capillary chaetae.
Parapodia biramous, with lateral sense-organs between branches and parapodial lobes flask-shaped or tapering (P. serpens-parapodium). Chaetae are capillaries and also in neuropodia 2 and 3 a few spines. Feathery chaetae starting at segment 17. Last 16-17 notopodia with straight and curved hooks (P. serpens-chaetae).
Gills start at segment 21.
Pygidium with two long and two short cirri (P. serpens-posterior end).

Up to 55 mm for 110 segments.

Anterior part red or pinkish, posterior part dark green to black with white spots.

On all kinds of substrata, from eulittoral to 1400 m.

North Sea to Bay of Kiel, Indian Ocean, red Sea, North Atlantic to Mediterranean.

Poecilochaetus serpens