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Making the world better, one answer at a time. Cnidarians are important in balancing the ecosystem, as all other organisms are. If there were a decrease in numbers, other living things which rely on cnidarians would also have problems.For example, when a jellyfish kills a fish for food, it is actually helping the other populations of fish that would need to compete with the one slain for food, territory, etc.es, many species of cnidarians have powerful stinging cells and potent venom strong enough to cause injury and or death to humans. These include the Portuguese man of war, th â¦ e sea wasp, lion's mane jellyfish, fire coral, and the carpet sea anemone.
Cnidarians. Cnidarians are a group of invertebrates that includes jellyfish, corals, sea anemones, and hydras. There are between 8,000 and 9,000 species of cnidarians alive today.The articles listed below provide information about the characteristics, classification and evolution of cnidarians.nidarians are a group of invertebrates that includes jellyfish, corals, sea anemones, and hydras.