![]() ![]() The tentacles are covered with cells, called nematocytes or cnidocytes, that are used in the trapping and killing of prey, defense against predators and sometimes in the construction of a tube in which the animal lives. Many species go through both of these stages during their life.ĭespite their rather innocent appearance, cnidarians are all predators that eat whatever they can catch and swallow. Like sponges, cnidarians have a very simple construction but they differ in that they have evolved some internal organs and a primitive neural system.Ĭnidarians exist in many sizes but basically only in two shapes: benthic polyps (for instance, anemones) that look like flowers and pelagic medusa (such as jellyfish) that look like parachutes. The Cnidaria are generally considered the second most primitive animals after the sponges. ![]()
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