Demosponges gallery (Demospongiae)

The Demosponges group includes the majority of sponge species (more than 80%). They have the particularity of having a skeleton (when present) composed of siliceous spicules and / or spongine. Porifers are marine and freshwater animals which filter water for food. Their surface is pierced with a multitude of small pores through which water enters, and fewer and wider openings, the oscules, through which water is drained (hence their name Porifère: from the Greek por- = passage).