@inbook{ERMS:SourceID:8983, author = {Rützler, K.}, journal = {In: Hooper, J.N.A.; Van Soest, R.W.M. (eds) Systema Porifera. A guide to the classification of sponges. 2 volumes}, note = {The PDF supplied here is a proof - NOT the definitive printed text - of a chapter of the Systema Porifera}, title = { Family Placospongiidae Gray, 1867. Pp. 196-200}, url = {http://marbef.org/data/aphia.php?p=sourcedetails&id=8983}, year = {2002} }