@inbook{ERMS:SourceID:8968, author = {Van Soest, R.W.M. and Hooper, J.N.A.}, 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 = {Order Spirophorida Bergquist & Hogg, 1969. Pp. 83-84}, url = {http://marbef.org/data/aphia.php?p=sourcedetails&id=8968}, year = {2002} }