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Phylum CnidariaDomain Eukarya Kingdom Animalia Sub-kingdom Eumetazoa Sub-sub-kingdom Radiata Phylum Cnidaria This group contains the hydras, hydroids, jellyfish, sea anemones and corals, about 9,000 species in all. They can be free swimming or sessile, and have tentacles surrounding the mouth. They all have nematocysts, which are specialised stinging cells used in prey capture and self defence. (Dorit et al, 1991) Class Anthozoa Class Cubozoa Class Hydrozoa Class Scyphozoa |