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R├╝tzler, K. (2002). Family Spirastrellidae Ridley & Dendy, 1886. Pp. 220-223. In Hooper, J. N. A. & Van Soest, R. W. M. (ed.) Systema Porifera. A guide to the classification of sponges. 1 (Kluwer Academic/ Plenum Publishers: New York, Boston, Dordrecht, London, Moscow).