Stromatoporoidea is an extinct order of colonial aquatic invertebrates. The group was previously thought to be related to the corals and placed in the phyllum Cnidaria. It is now thought to belong to the sponges (Porifera). There are numerous fossil forms, dating from the Cambrian to the Cretaceous periods, with spherical, branching or encrusting skeletons of lime.

Porifera | Prehistoric animals | Stromatoporen