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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 include jellyfish and corals. Cnidarians are less  complex than annelids or mollusks because the latter have gills  with many layers of tissue.cientists also believe they have a common ancestor because both phylla contain species w â¦ hich produce free-swimming Trochophore Larvae (most molluscs except Cephalopods, and Class Polychaeta in Annelids). 2 people found this useful.