A long, dorsally flattened worm (between 5 -15 cm in length) with up to 200 segments. The eversible proboscis is long and cylindrical and covered in small, rounded papillae. The head has two large eyes, 5 antennae and 4 pairs of tentacular cirri, the longest of which may reach back to about the 7th segment. The paddles on the parapods are flattened, elongated and narrow to a point. The worm is bright to mid-green in colour.