Literature
  • , 1990
  • The Marine Fauna of the British Isles and North-West Europe. Clarendon Press, Oxford.
  • Howson 1997
  • Priapulida. In: The species directory of the marine fauna and flora of the British Isles and surrounding seas (Howson, C.M. & B.E. Picton, eds). Ulster Museum and The Marine Conservation Society, Belfast and Ross-on-Wye.
  • Howson, 1997
  • Echiura. In: The species directory of the marine fauna and flora of the British Isles and surrounding seas (Howson, C.M. & B.E. Picton, eds). Ulster Museum and The Marine Conservation Society, Belfast and Ross-on-Wye.