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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.
Share. By Laura Klappenbach. Cnidarians (Cnidaria) are a group of aquatic animals that includes jellyfish, corals, sea anemones, and hydras. The basic form of the cnidarian body is quite simple and consists of a gastrovascular cavity with a single opening through which food is ingested and waste is released.nidarians (Cnidaria) are a group of aquatic animals that includes jellyfish, corals, sea anemones, and hydras.