Definition that contains entera
- jellyfish any of numerous usually marine and free-swimming coelenterates that constitute the sexually reproductive forms of hydrozoans and scyphozoans
- medusa 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
- polyp 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
- medusan 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
- ctenophora comb jellies; sea acorns; a small phylum formerly considered a class of Coelenterata
- hydrozoa coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes
- anthozoa a large class of sedentary marine coelenterates that includes sea anemones and corals; the medusoid phase is entirely suppressed
- scyphozoa coelenterates in which the polyp stage is absent or at least inconspicuous: jellyfishes
- medusoid 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
- genus acropora coelenterate genus of order Madreporaria, including staghorn corals