Bergquist, P.R.; Cook, S.D.C. 2002. Family Darwinellidae Merejkowsky, 1879. Pp. 1068-1071. In: Hooper, J. N. A. & Van Soest, R. W. M. (ed.) Systema Porifera. A guide to the classification of sponges (2 volumes) Kluwer Academic/ Plenum, NY 1708+ XVLIII. ISBN 0-306-47260-0 (printed version).
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Bergquist, P.R.; Cook, S.D.C. 2002. Family Darwinellidae Merejkowsky, 1879. Pp. 1068-1071. <i>In</i>: Hooper, J. N. A. & Van Soest, R. W. M. (ed.) <i> Systema Porifera. A guide to the classification of sponges </i> (2 volumes) Kluwer Academic/ Plenum, NY 1708+ XVLIII. ISBN 0-306-47260-0 (printed version).
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The PDF supplied here is a proof - NOT the definitive printed text - of a chapter of the Systema Porifera