Question: why are cnidarians not considered coelomates?
Answer: Cnidarians are not considered to have a coelom because they are diploblastic, so they don't have any mesodermic tissue. Cnidaria are a phylum consisting of aquatic animals like jellyfish, anemones, and corals. ... Cnidarians have an incomplete digestive tract, which means that they eat and excrete from the same opening.