Cnidaria
A Cnidarian is any invertebrate animal belonging to the phylum Cnidaria. The Cnidarians include the Hydro ids, Jellyfish, Anemones, and Corals. The unique quality of this phylum's skeletal system is that it is able to move around even without having a backbone. The animals of this phylum are able to move through the use of their tentacles and umbrella like upper body.
Anemone
The Anemone is a soft-bodied member of the phylum Cnidaria. Its body structure is mainly composed of their tentacles and their circular base where their mouth is located. This Cnidarian is not able to move freely around in the ocean. Its body is attached to a a hard surface. Anemones have no solid skeleton but may secrete a horny covering. Its tentacles also use electricity as a defense mechanism.
Coral
Coral is another member of the phylum Cnidaria. Its skeletal structure is constructed of aragonitic crystals organized into fan systems. Corals usually form colonies containing many individuals. Corals are comprised of either hard or soft anatomy. Hard Corals have a white skeleton that is made of limestone. Hard Corals usually build the coral reefs found in the ocean. Soft Corals have little limestone crystals in their jelly-like tissue.
Jellyfish
The Jellyfish's skeletal system is known as a hydro skeleton which consists of a fluid-filled cavity surrounded by muscles. This skeletal system is mostly found in cold-blooded and soft-bodied animals. The Jellyfish is able to move around with the use of its umbrella like body and its tentacles. These tentacles are the animal's defense since they use electricity. This animal has no bones contained within its body, instead it has a gelatinous substance. This substance acts like a structural support in the water. The jellyfish's body is very fragile which is why it would collapse if it were ever to washed up upon a shore.