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sponges aquatic animals that make up the phylum porifera , have no tissues, no organs and no symmetry; have pores sessile describes an organism that remains attached to a surface for its entire life regeneration (biology) growth anew of lost tissue or destroyed parts or organs cnidarians invertebrates that have stinging cells and take food into a central body cavity, have radial symmetry medusa form free-swimming polyp form sessile tentacles long arm-like limbs with suction cups, like on an octopus cnidocytes specialized cells used for defense and capturing prey, stinging cells nematocysts stinging cells that discharge when tentacles are touched jellyfish any of numerous usually marine and free-swimming coelenterates that constitute the sexually reproductive forms of hydrozoans and scyphozoans coral marine colonial polyp characterized by a calcareous skeleton