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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.
Cnidarians. Cnidarians are a group of invertebrates that includes jellyfish, corals, sea anemones, and hydras. There are between 8,000 and 9,000 species of cnidarians alive today.The articles listed below provide information about the characteristics, classification and evolution of cnidarians.nidarians are a group of invertebrates that includes jellyfish, corals, sea anemones, and hydras.