basis of recordHayward, P.J. & J.S. Ryland (Eds.). (1990). The marine fauna of the British Isles and North-West Europe: 1. Introduction and protozoans to arthropods. Clarendon Press: Oxford, UK. 627 pp. (look up in IMIS) [details] Available for editors
additional sourceMuller, Y. (2004). Faune et flore du littoral du Nord, du Pas-de-Calais et de la Belgique: inventaire. [Coastal fauna and flora of the Nord, Pas-de-Calais and Belgium: inventory]. Commission R�gionale de Biologie R�gion Nord Pas-de-Calais: France. 307 pp., available online athttp://www.vliz.be/imisdocs/publications/145561.pdf[details]
source of synonymyHayward, P.J.; Ryland, J.S. (1999). Cheilostomatous Bryozoa: part 2 Hippothooidea - Celleporoidea: notes for the identification of British species. 2nd ed.. Synopses of the British fauna (new series), 14. Field Studies Council: Shrewsbury, UK. ISBN 1-85153-263-3. vii, 416 pp. (look up in IMIS) [details]