Priapulida, Sipuncula, Echiura, Pogonophora, and Entoprocta
Knight-Jones, E.W.; Ryland, J.S. (1990). Priapulida, Sipuncula, Echiura, Pogonophora, and Entoprocta, in: Hayward, P.J. et al. The marine fauna of the British Isles and North-West Europe: 1. Introduction and protozoans to arthropods. pp. 307-321
In: Hayward, P.J.; Ryland, J.S. (Ed.) (1990). The marine fauna of the British Isles and North-West Europe: 1. Introduction and protozoans to arthropods. Clarendon Press: Oxford. ISBN 0-19-857356-1. xvi, 1-627 pp., more
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