any animal lacking a backbone or notochord; the term is not used as a scientific classification

hydras; polyps; jellyfishes; sea anemones; corals

the saclike body cavity of a coelenterate

one of two forms that coelenterates take (e.g. a hydra or coral): usually sedentary with a hollow cylindrical body usually with a ring of tentacles around the mouth

one of two forms that coelenterates take: it is the free-swimming sexual phase in the life cycle of a coelenterate; in this phase it has a gelatinous umbrella-shaped body and tentacles

any of numerous usually marine and free-swimming coelenterates that constitute the sexually reproductive forms of hydrozoans and scyphozoans

any of various usually free-swimming marine coelenterates having a gelatinous medusoid stage as the dominant phase of its life cycle

colonial coelenterates having the polyp phase dominant

hydras; polyps; jellyfishes; sea anemones; corals

the saclike body cavity of a coelenterate