CELINA - Though dinosaurs are the most notable of the prehistoric animals, smaller mammals and fish walked and swam in Ohio, ...

The Devonian ancestors of fishes living today belonged to two main nonarmored groups. The cartilaginous fish, so-called because cartilage formed their skeletons, later gave rise to sharks and rays.

The early appearance of sharks can be attributed to the aquatic environment of the Devonian seas. Water, despite its penchant for chaos and turbulence, provided a stable medium for life due to ...