All sponges have osties, channels that lead inside through the mesohyl, and in most sponges, these are controlled by tubular poroccytes that form lockable inlet valves. Pinacocytes, plate-like cells, form a single-layer outer skin on top of all other parts of the mesohyl that are not covered with choanocytes, and pinacocytes also digest food particles too large to penetrate ostia,[28][30] while those at the base of the animal are responsible for anchoring. .
Show Agreement To Carry About A Thousand Small Sponges
