This species has a maximum size of 30 mm. The background color is dark brown or black and the body is covered with large orange or yellow spots. The margin of the parapods are marked with a thin white line. The two rather long "tails" at the end of the animal are characteristic of the genus Chelidonura, the left one is always longer. Chelidonura always have well-developed sensorycilia on the anterior edge of the head which are used to find the prey.