The final class

    The class Sclerospongiae has been subjected to change as new scientific innovations and theories have developed.  Many scientists, including those who conferred with us, dispute over the controversial existence of the Sclerospongiae class.  New research suggests that particular integral components of this class promote the fact that its members may be distributed among the classes of the Demospongiae and Calcarea.  For clarity, we will analyze the class as if it does exist.
    Geographically, they are confined to the temperate waters of coral reefs in the Pacific Ocean and West Indies.  By analysis of physical composition, it is easy to comprehend why they contribute to coral reefs.  They are (or were) noted for their thin silica and spongin pinacocyte exterior layer.  A voluminous central cavity generates substantial water filtration, nourishment for plankton and other microscopic organisms within its habitat, and domiciles for these microscopic animals (such as shrimp.)  Such species have gradually adapted to the hazardous toxins implemented as protection for the sponges.  The central cavity, however, is calcareous with choanoflagetta in various crevices.  Due to this fact , many Sclerospongiae (such as the Astroclera family) have experienced transition to the Calcarea class.  As a result of their spongin fibers, others have been converted to Demospongiae.  Interestingly enough, this class was only discovered in 1970, and only twenty-nine years later, it has been "abandoned."