While the common ancestor of vertebrates with synovial joints is still a mystery, the oldest specimen with evidence of these ...

A research team led by Neelima Sharma from the University of Chicago examined the anatomy and development of joints in modern cartilaginous fish, such as sharks, and compared them to jawless fish ...

3 min read During the Ordovician period, part of the Paleozoic ... extinct. Fish started becoming more widespread in the fossil record. They were small and had downward-pointing, jawless mouths ...