- Key facts
A long and slender species: up to 15 cm long and 0.5-1.0 mm wide. The head is flattened and rather spatulate. The body tapers posteriorly. It produces copious amounts of viscid mucus and readily forms delicate tubes to which sand grains adhere. Colour overall pure milky-white, although the intestinal regions may be faintly tinged orange-brown or yellowish-brown. The posterior body margins are often translucent.