The Demospongiae are the largest class in the phylum Porifera. Their "skeletons" are made of spicules consisting of fibers of the protein spongin, the mineral silica, or both. They contain 90% of all species of sponges.
Its in the class demospongia
calcispongia----composed of calcium hyalospongia.....made of silicates demospongia....made of protein
Sponges are divided up into three groups depending on their cell/bone structure:CalcareaGlass SpongeDemospongeHope this helps :D
There are thousands of different types of sponges, so there's not enough room to list them all. Here's a great website showing several hundred different sponges found in the Caribbean so you can get some idea of the different groups they fall into.