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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.
Jellyfish, corals, and other stingers. Cnidarians are incredibly diverse in form, as evidenced by colonial siphonophores, massive medusae and corals, feathery hydroids, and box jellies with complex eyes. Yet, these diverse animals are all armed with stinging cells called nematocysts.Cnidarians are united based on the presumption that their nematocysts have been inherited from a single common ancestor. The name Cnidaria comes from the Greek word cnidos, which means stinging nettle.nidarians are incredibly diverse in form, as evidenced by colonial siphonophores, massive medusae and corals, feathery hydroids, and box jellies with complex eyes. Yet, these diverse animals are all armed with stinging cells called nematocysts.