This jellyfish is an example of a cnidarian.
any of a phylum (Cnidaria) of invertebrate animals, mainly marine, including jellyfishes, hydrozoans, and anthozoans, characterized by stinging cells and a saclike body cavity with a single opening for ingesting food and eliminating wastes; coelenterate
Origin of cnidarianModern Latin Cnidaria ; from Classical Greek knidē, nettle + -aria: so called for the creatures' stinging cells
Any of various invertebrate animals of the phylum Cnidaria, characterized by a radially symmetrical body with a saclike internal cavity and stinging nematocysts, and including the jellyfishes, hydras, sea anemones, and corals.
Origin of cnidarianNew Latin Cnīdāria, phylum name, from Greek knīdē, sea nettle.