腔肠动物
6.Any of various invertebrate animals of the phylum Coelenterata, characterized by a radially symmetrical body with a saclike internal cavity, and including the jellyfishes, hydras, sea anemones, and corals.
8.coelenterates in which the polyp stage is absent or at least inconspicuous: jellyfishes.
9.comb jellies; sea acorns; a small phylum formerly considered a class of Coelenterata.
10.Any of numerous coelenterates of the class Hydrozoa, including the freshwater hydras, hydroids, hydrocorals, and siphonophores.


