Sharks own vertebral in the center of their bodies. They do not have bony spine, but vertebral from cartilage. That material works almost alike well for back weight, but it weighs much less.
Because of this light quality, the shark is not so strongly drawn down in the water. The soft shape of cartilage helps them slip through the sea by means of whole body and tail fin.
Shark Backbones Made of Cartilage
Although shark skeletons consist chiefly from cartilage, the vertebrae is other reason. The central part of vertebra, called vertebral centra, form the densest part of the skeleton. Here happened more mineralization than in the rest.
Hence commonly stay only vertebrae and teeth. Full fossil shark skeletons are rare to find. When that happens, the vertebrae can become almost stone, although soft.
They tell scientists many secrets, for instance formula that estimates the body length from diameter of one vertebra.
Identify shark from vertebra can be really hard. Vertebrae of various species look commonly similar. Only from pictures almost can’t do.
For right diagnosis you need observe at least 14 main vertebrae and take physical measures. Also the rings in vertebrae help to estimate age, similar to rings in trees. They preserve chemical traces of the environments, in that the sharks lived.
Various species have different vertebrae. Exist lamnoid-type vertebrae and scyliorhinoid, that comes of requiem sharks. If sample from live creature shines white, it is not mineralized.
Widely they are round, some huge, and present on beaches in places as South Carolina or Prince Edward Island. Investigators analyse element tracers in vertebrae of species as Bull Sharks, Bonnethead Sharks, Blacktip Sharks, Spinner Sharks and Shortfin Mako Sharks for understand their habitats and movements. Although they are cartilaginous, those creatures yet belong to vertebrates because of his spinal column.