@inbook{NARMS:SourceID:9063, author = {Van Soest, R.W.M. and Hooper, J.N.A.}, note = {The PDF supplied here is a proof - NOT the definitive printed text - of a chapter of the Systema Porifera}, title = {Suborder Petrosina Boury-Esnault & Van Beveren, 1982. Pp. 891-892. In: Hooper, J.N.A. & Van Soest, R.W.M. (eds) Systema Porifera. Guide to the classification of sponges. 2 volumes. Kluwer Academic/ Plenum Publishers: New York, 1708 + xvliii. ISBN 0-306-47260-0 (printed version)}, url = {https://vliz.be/vmdcdata/narms/narms.php?p=sourcedetails&id=9063}, year = {2002} }