Key facts

Length up to 11 cm, width up to 4 mm. A long and slender species with very variable color dorsally, greenish/brownish/reddish, somewhat paler lateral margins and distinctly paler ventral side. The typical heteronemertean lateral slits on either side of the head extend back to the brain, which is usually visible through the body wall as two diffuse reddish spots, and at least two eyes are situated along the dorsolateral margin on either side of the head. Very similar to Lineus ruber and Lineus viridis, but with a caudal cirrus (that may be lost). Common occurrence in most habitats in Norway.