Suborder Spongillina subord. nov.: Freshwater sponges. Pp. 921-1020 - Manconi, R.; Pronzato, R. (In Hooper, J.N.A.; Van Soest, R.W.M. (eds) Systema Porifera. A guide to the classification of sponges. 2 volumes., 2002)
The PDF supplied here is a proof - NOT the definitive printed text - of a chapter of the Systema Porifera