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(Rathke, 1843)

Attains a length of 30-60 cm, but is only 1-2 mm wide. The elongate head is marginally broader than the succeeding trunk regions and bears 6-15 eyes in a dorsolateral row on each side (L. lacteus-detail). The mouth is located some distance behind the cerebral ganglia in contrast to the usual immediate post-cerebral position in other lineids. Behind the cerebral ganglia, the pale pink to reddish colouration of the head gradually fades to a uniform white or pale creamish-yellow; the tip of the snout and the tail are translucent (L. lacteus). Dermis without connective tissue layer. Proboscis extraordinarily slender, with two muscle layers.

Has been found sublittorally to intertidally, on gravel, sand or beneath stones.

The geographic distribution extends from the British and French Atlantic coasts to the Mediterranean and Black Seas. Lineus lacteus is apparently much more common on Mediterranean than on Atlantic coasts.

Lineus lacteus