Pie charts showing the importance of Demospongiae subclasses and orders in terms of number of species. A. Demospongiae subclasses. B. The 22 Demospongiae orders from the revised classification, in alphabetical order. Numbers of species are estimates obtained from the World Porifera Database http://www.marinespecies.org/porifera/ (accessed on the 17th of October 2014).