X-rays of an ancient jawless fish shows earliest-known example of internal cartilage skull, unlike that of any other known vertebrate.
A 455-million-year-old fossil fish provides a new perspective on how vertebrates evolved to protect their brains, a study has found.
This ancient fish had separated, independent cartilages encasing the brain, rather than the solid bone or cartilage structure of jawless and jawed fish that followed it.
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