Cnidarians are aquatic organisms that can be found in both freshwater and marine habitats. They were previously classified as part of the phylum Coelenterata.
Cnidarians are a phylum of marine creatures that have radial symmetry and tissue level organisation.
These were considered to be the first animals to have a distinct shape in evolutionary history.
Massive medusae and corals, colonial siphonophores, feathery hydroids, and box jellyfish with sophisticated eyes are only a few examples of this group's members.
Cnidarians don't have true mesoderm, which is a third germ layer that develops as a result of gastrulation.
Cnidaria is made up of two germ layers: endoderm and ectoderm.