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Schneider, 1868

Body long and cylindrical.
Prostomium with two stiff tentacles, distinctly separated at their bases (length 600-780 µm, often unequally long). Two oval nuchal organs dorsolaterally situated in distinct grooves between prostomium and trunk.
Trunk without external constrictions between segments.
Bulb-like pygidium pre-terminally swollen, without appendages; peripherally encircled with a ring of 26-28 conspicuous mounds of glandular openings (number 35-43). Anus terminal; anal margin may have several lobe-like folds.
Female fertile region starting between segments 50 and 70. Male fertile region starting between segment 40 and 60.

Up to 100 mm for 150-185 segments.

Opaque white, faintly pink to salmon; surface smooth and iridescent. Blood greenish-grey. Mature females reddish owing to colour of oocytes. Males with sperm appear white.

Coarse, clean sand and sandy or shelly gravel in subtidal areas.

Atlantic Ocean (Ireland, Shetlands), North Sea (Helgoland), English Channel (Plymouth, Roscoff area), Irish Sea (Isle of Man), possibly the Mediterranean and Black Sea.

Polygordius lacteus