Nidaria

Nidariya  say diploblastika (Diploblastic) refers to animals, the animals dbistara with the fetus. They were formerly known as Coelenterata. Most of these are marine, some freshwater inhabitants of the Greek word Knide meaning Rome or thorn and Aria meaning attached. The word Cnidaria is a combination of these two words. Scientist Hatschek in 18

Cnidaria was the first to name the episode. Due to the variety of colors, the members of this episode have contributed the most to the colorful appearance of the sea. Corals and coral wall forming animals are members of this episode. This is why Niederian animals are called the flower of the sea 

Features

Although some cells form tissues (e.g., neurons), most cells are isolated but specialized for specific functions.

• Diploblastic animals i.e. their embryos have two layers. The outer layer is the ectoderm and the inner layer is the endoderm. Between these two layers lies a substance called aqueous mesoglia, a liquid jelly.
• Adult animals also have two layers. The wide cavity inside the body is known as the gastrovascular cavity or coelenteron and it is exposed to a single perforated passage (the orifice).
• Radial symmetry means that the body can be divided evenly two or more times by intersecting along a single plane passing through the central axis of their body.
• The epidermis is surrounded by a large number of cells called cnidoblasts around the mouth, which contains a sac called the tomatocyst, which carries toxins, and a strap-like tube called a thread tube to apply the toxins.
• Acoelomate animals, i.e. body cavities or silos are missing here.

photo : googol