![]() ![]() The spongocoel leads into the osculum, which has an adjustable diaphragm. Apopyles open into a central cavity or the spongocoel. The tubes are arranged radially and have openings call apopyles. Internal flagellated tubes are responsible for water current. The spicules appear to lie in a jelly called mesohyl, a structureless jelly containing archaocytes, amoeboid cells, and others. Y-shaped tetraxon calcite spicules lining the spongocoel and triactine spiclules in the walls of the flagellated chambers form the supporting skeleton of the sponge. The spicules surrounding the osculum opening are longer than those at the base of the body. Hairy, needle-like spines (called spicules) cover their bodies. Their bodies are arranged in the asconoid system, which is a simple tube with no folding of the outer body wall. Sycon ciliata are creamy yellow in color and delicate-looking. They are found on the underside of rocks in relatively protected areas among bryozoans, hydroids, and other organisms. Sycon ciliatum live in shallow marine waters, from the intertidal zone out into sublittoral depths. They are predominant in temperate regions. Sycon ciliatum are marine sponges found world-wide, usually in shallow water, but rarely more than 150 meters deep. ![]()
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