Cniderea
Man of War Jellyfish
Most cniderea are dipoblastic which means they are made of only 2 main layers of cells, the outer layer called the epidermis and the inner layer called the endoderm. All cniderea have one main cavity in the center of their body that acts as its mouth and uses it for waste removal. The cniderea has two basic structures polyps witch are abound to one spot and are usually tube shaped and with either an exo or endo skeleton that are made up of minerals like calcium carbonate or organic material like chitin. The tentacles for most polyps are Invertebrate skeletons witch allows the tentacles to move more freely and to capture food. Another form of cniderea is medusa witch only has a hydrostatic skeletal system that allows these creatures to swim freely and give it buoyancy. Some creatures even start as polyps and eventually evolve in to medusa, this is called polymorphic.
Anthozoa
Sea Anemone
This class of cniderea has over 6,000 species and is mostly colonial or solitary polyps. They lack a medusa phase and stay anchored their entire life. These animals have a V shaped cavity in the center of their bodies. An example of an Anthozoa is sea anemones.
Hydrozoa
Fire Coral
This class of cniderea contains over 2,700 species consisting of many different types of colonial hydroids and fire coral. Hydrozoa animals contain all the different forms of Cniderea, Polyps, medusa and polymorphic.
Scyphoza
Jelly fish Diagram
The scyphoza contains 200 species of large jelly fish. Most jelly fish live in the medusa stage but several jelly fish were found in the polyps and polymorphic phases. Jellyfish do not have bones’ but a hydrostatic skeletal system. An example of a scyphoza would be the box jelly fish.