In this study, Sharma and colleagues examined the anatomy and development of joints in members of two early-branching vertebrate lineages: one species of jawless fish, sea lampreys, and two ...

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 ...

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 ...