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Reiswig, H. 2002. Class Hexactinellida Schmidt, 1870. Pp. . In Hooper, J. N. A. & Van Soest, R. W. M. (ed.) Systema Porifera. A guide to the classification of sponges. 2 (Kluwer Academic/ Plenum Publishers: New York, Boston, Dordrecht, London, MosReisw