Haplosclerida
Encyclopedia
Haplosclerida is a order of demosponge
. This order includes fresh water sponges.
Demosponge
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. Where spicules of silica are present, they have a different shape from those in the otherwise similar glass sponges...
. This order includes fresh water sponges.