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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.
Cnidocytes are a distinctive feature of cnidarians (jellyfishes, sea anemones, corals, hydrae, etc .). These are explosive cells used by cnidarians in order to capture their prey (e.g. fish and crustaceans). These cells shoot off threadlike, often toxic, tubule inside the cnidocyst.