Emplectonema gracile (Johnston, 1837)

Length up to 35 cm, width 1–2 mm. Very long and soft nemertean often forming a large coil. Head egg-shaped and much wider than body, with a large number of black eyes scattered along the light margins. Body colour greyish green with a pale ventral side. Inhabits rocky bottoms from littoral and down, often associated with algal holdfasts or blue mussels.