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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.
Cnidaria is a phylum or scientific classification involving about 9000 species of animals that mostly can be found on water. Animals that belong to this scientific phylum or class are called âcnidariansâ. Cnidarians have distinct cells called âcnidocytesâ which are mainly used for catching prey.Most members of the Cnidaria phylum have jelly-like bodies like the common jellyfish known to people.Other animals belonging to this group include corals, sea pens, hydras, and sea anemones.For some people, some members of the Cnidaria phylum may seem to look more like plants but are actually animals that have similar structures to other âcommonâ animals like fishes, birds, reptiles, and mammals.he last group of Cnidarians is called Hydrozoa and this group includes a very diverse collection of sea creatures and forms. Most members of the Cnidaria group eat plankton and other animals to survive.