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Valisano L, Pozzolini M, Giovine M, Cerrano C. (2012). Biosilica deposition in the marine sponge Petrosia ficiformis (Poiret, 1789): the model of primmorphs reveals time dependence of spiculogenesis. In: Maldonado M, Turon X, Becerro MA, Uriz MJ (eds) Ancient Animals, New Challenges. Sponge Research Developments. Hydrobiologia 687, pp 259-273.