Phylum porifera
Phylum (porifera)
Three types of sponges are known, the ascon, sycon, and Leon types, according the structureral complexity
A- The ascon type :
Leucosolenia: is a simple sponge which grows on rocks near the sea shore in colonies it has a skeleton of calcium carbonate , deposited mostly in the e form of trirediate spicules.
B-the Sycon type
Sycon :
General body form vase- shaped, with a large osculum at the free end, encircled by a fringe of large straight monoaxonic spicules.
C- The lecon type
The bath sponge
Euspongia:
The skeleton is composed of a complex network of sponging fibers.
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