Phylum Porifera - Sponges. Among the most ancient animals Mostly marine but some fresh water Porifera - literally means “pore bearer”, which is appropriate because they have tiny openings all over their body Once thought to be plants because they are sessile . What are Sponges?.
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Porocytes = pore cells
Choanocyte = collar cell
Spongocoel = central cavity
Mesohyl = jelly-like inner layer