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Another aspect of cnidarians is that all cnidarians have two layers of living tissue. These two layers are always separated by a gelatinous layer called mesoglea. The first layer of living tissue is known as the dermis, and the second layer is know as the gastordermis.
There are two types (or body plans) of cnidarians. There is the Medusa, which is a Jellyfish, really. And there is a Polyp, which is like an upside-down Jellyfish, if you want it simply.A polyp would be your sea anemone or coral.They spend most of their lives attached to a hard surface underwater. All Cnidarians are aquatic and carnivorous, and they occur in two basic body shapes: polyps,â¦. 2  Characteristics of Cnidaria Cnidaria is an alternative name for the invertebrate phylum Coelenterata, giving emphasis to the stinging structures as characteristic of the phylum.