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amoebocytes cells within a sponge that produce its skeletal structure, perform digestion, and repair cell damage metamorphosis a complete morphological change larval to adult form polyp an attached cnidarian stage, appearing sac-like or barrel-like medusa a free-swimming cnidarian stage, appearing bell-like or umbrella-like mesoglea a jelly-like substance between the inner layer and outer layer of cells in a cnidarian mutualism a relationship between two or more organisms of different species where both benefit from the association commensalism a relationship between two or more organisms where one benefits and the other is neither harmed nor benefited parasitism a relationship between two or more organisms of different species where one benefits and the other is harmed radial symmetry example: sea anemone bilateral symmetry example: flatworm spongin a web-like skeleton of elastic protein fibers spicules very rough, glassy structures that are made of calcium carbonate or silica polyps and medusas mouth, tentacles, gastrovascular cavity tapeworms long bodies made up of repeated units hydrozoa example: Portugese Man-O-War scyphozoa example: jellyfish anthozoa example: coral polyps parasites example: flukes lophophore crown of ciliated tentacles around the mouth used for gathering food osculum a large opening on a sponge through which filtered water is expelled gemmule a group of cells surrounded by a shell made of spicules coelom a body cavity within organisms containing specialized tissue gills extensions of the body containing thin-walled blood vessels that allow for easy absorption of oxygen from the outside surface