The final class
Is most diminutive and small
In respect to its origins
Some say it doesn't exist at all
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."