A gastrovascular cavity serves as both a mouth and an anus in members, all of which exhibit radial symmetry.
The smallest class of this phylum contains Chironex fleckeri, which contains poison that can be fatal to humans. The endoderm and ectoderm of members of this phylum are held together by a layer of gelatinous material called a mesoglea. A gastrovascular cavity serves as both a mouth and an anus in members, all of which exhibit radial symmetry. Members of class Anthozoa only have a polyp form, while members of class Hydrozoa have a polyp and medusa form. For ten points -- name this phylum, whose members include sea anemones, corals, and jellyfish.
The smallest class of this phylum contains Chironex fleckeri, which contains poison that can be fatal to humans.
Cnidaria