Water entering the spongocoel is extruded via a large common opening called the osculum. Water can enter into the spongocoel from numerous pores in the body wall. Intracellular digestion.The morphology of the simplest sponges takes the shape of a cylinder with a large central cavity, the spongocoel, occupying the inside of the cylinder. Food particles are trapped in mucus produced by the sieve-like collar of the choanocytes and are ingested by phagocytosis. The beating of flagella from allĬhoanocytes moves water through the sponge. The choanocyte is embedded in mesohyl but protruding into the spongocoel is a mesh-like collar surrounding a single flagellum. The mesohylĬontains embedded amoeboid cells that secrete tiny needles called spicules or protein fibers that help give the sponge its structural strength. Sponges consist of an outer layer of flattened cells and an inner layer of cells called choanocytes separated by a jelly-like substance called mesohyl. However, sponges exhibit a diversity of body forms, which vary in the size and branching of the spongocoel, the number of osculi, and where the cells that filter food from the water Water flows out through a large opening called the osculum ( Figureġ5.9). Water enters the spongocoel from numerous pores in theīody wall. The body of the simplest sponges takes the shape of a cylinder with a large central cavity, the spongocoel.
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