Ordo Echiurida

Literature

• Knight-Jones, E.W. & J.S. Ryland 1990. Priapulida, Sipuncula, Echiura, Pogonophora, and Entoprocta. In: The Marine Fauna of the British Isles and North-West Europe. (ed. P.J. Hayward & J.S. Ryland). Clarendon Press, Oxford.