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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.

Shipley, A.E., 1901. Gephyrea and Phoronis. In: The Cambridge Natural History (Harmer, S.F. & A.E. Shipley, eds.). MacMillan and Co., Ltd. London.

Priapulus caudatus