What is Demosponge?
{{taxobox | name = Demospongiae | image = Barrel sponge (Xestospongia testudinaria).jpg | image_caption = Barrel sponge (''[[Xestospongia testudinaria]]'') | regnum = [[Animal]]ia | phylum = [[Porifera]] | classis = '''Demospongiae''' | authority = [[William Johnson Sollas|Sollas]], 1885 | subdivision_ranks = Subclasses | subdivision = [[Homoscleromorpha]]<br/> [[Tetractinomorpha]] }} The '''Demospongiae''' are the largest class in the phylum [[Sponge|Porifera]]. Their [[skeleton]]s are made of spicules consisting of fibers of the [[protein]] spongin, the mineral silica, or both. Where spicules of silica are present, they have a different shape from those in the otherwise similar [[Hexactinellid|glass sponges]]. {{biology-stub}} [[category:Sponges]]