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Download 3) Sponges and Cnidarians
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November 15, 2011 Sponges and Cnidarians Characteristics of Sponges • Sessile - cannot move, are attached to one place. • Filter Feeders – take out tiny organisms and oxygen from the water as it passes over the sponge. • Flagella– thin, whiplike structures that help move water over the sponge. • Have soft bodies that are supported by sharp, needle like structures. • Bodies are asymmetrical Characteristics of Cnidarians • Have tentacles that surround their mouth to catch food and for protection. • Tentacles have stinging cells on them. • Get Oxygen from water passing over body. • All have radial symmetry 2 Body Forms of Cnidarians 1) Polyp – vase shaped body, attached to ground *example – sea urchin and sea anemones 2) Medusa– bell shaped body, free swimming *example – jellyfish
