Adaptation
Because Plakortis
simplex is classified into the phylum
Porifera, it is sessile or immobile during
its adult stage. This also implies
that it has no true tissues. However,
P. simplex does have a layer of cells
that forms most of the epidermis which is
similar to a true tissue but still is not
considered to be. Plakortis simplex
maintains support by a proteinacious
substance called spongin which forms a
strong fibrous system as well as spicules
made from silica. It does
not have any sensory cells, but it does have
ostia which are openings in the wall of the
sponge. It
closes its ostia when there is too much
matter in the water or if it is touched.
For nutrition information on P. simplex click here.