This is an example of a brittle fish
The Ophiuroidea have a skeleton of calcium carbonate which is in the material of calcite. The plates are covered by the skin, which consists of a smooth syncytium. Most times the joints are covered by the plates and do not allow the arms to move upwards, but in the basket stars, the arms are flexible in all directions.
The ossicles are surrounded by thin ring of soft tissue, and then by four layers of plates. In ophiuroids the vertebrates are linked by well-structured muscles. Ophiuroida move left to right, and Euryalina move up and down. Euryalina have bigger vertebrae and smaller muscles. They can wrap their arms around objects because of the soft ring of tissue.
The ossicles are surrounded by thin ring of soft tissue, and then by four layers of plates. In ophiuroids the vertebrates are linked by well-structured muscles. Ophiuroida move left to right, and Euryalina move up and down. Euryalina have bigger vertebrae and smaller muscles. They can wrap their arms around objects because of the soft ring of tissue.