Cnidarians: Freshwater Hydra, Jellyfish and Corals

"Cnidarians" is a Greek "hedgehog" ("introduction of Cnidaria"). Phnum Cnidaria contains freshwater jellyfish, jellyfish and coral. Each of these invertebrates changes its body type. Jellyfish is the most unusual and complicated in the door. Jellyfish belongs to Scyphozoa and means true jellyfish. Kunidaria is found in the Mediterranean Sea and the ocean. They can live in the ocean and coastal waters. However, the main habitat of Cnidarians is in the high seas.

Classification of the animal kingdom and quasi-states of metazoans (organisms with organs and organ systems such as jellyfish, sea anemone, water, coral) have the Kujidarian gate which is a jellyfish. Group to which it belongs. They alternate between polyp and jellyfish stages. They are usually small and may be colonial or different. Siffophonores are included in this class. They are floating colonies of polyps and jellyfish, large and rich toxic cells used for self-defense, and in some cases can become fatal to people. Siphons form complex colonies specialized for individuals with different functions; things used as floating organs, something used for nutrition, defense or sensation

There are three different types of Kunidaria: (1) Hydroza containing water, (2) jellyfish, (3) polyps including anemone and coral. All animals in this group were described as tentacles with stinging cells. Their digestive tract has only one opening. This opening needs to balance both the mouth and the anus. The body walls consist of at least two layers. The outer layer forms a covering of the body called ectoderm and the interior called endoderm that aligns the gastrointestinal tract. Some cnidarians have a third layer composed of substances like hard jelly that helps to support animals.

In a true animal (multicellular) animal the echinoderms (anemone, coral and jellyfish) are diploid and the endoderm and ectoderm are separated by acellular mesothelium. Anemones and corals also grow to quite large sizes and may exhibit complex external structures, which also have the effect of increasing the surface area. Those essentially simple structures - the gastric vascular lumen that is contiguous with the water of the external environment - allows endoderm and ectodermal cells of the body wall to enter the aeration water and allows direct diffusion