Paleontology in Ohio

thumb|Dunkleosteus (left) and Titanichthys (right)

Dinichthys (from , 'terrible' and 'fish') is an extinct monospecific genus of large marine arthrodire placoderm from the Late Devonian (Famennian stage) measuring around long. Fossils were recovered from the Ohio Shale Formation along the Olentangy River in Delaware County, Ohio.

natural history museum in Cleveland, Ohio, USA

Acidaspis is an extinct genus of odontopleurid trilobite from the Ordovician to Silurian of North America and Europe. Although small, it had long spines along its body.

Odonterpeton is an extinct genus of "microsaur" (small reptiles or reptile-like amphibians) from the Late Carboniferous of Ohio, containing the lone species Odonterpeton triangulare. It is known from a single partial skeleton preserving the skull, forelimbs, and the front part of the torso. The specimen was found in the abandoned Diamond Coal Mine of Linton, Ohio, a fossiliferous coal deposit dated to the late Moscovian stage (Westphalian D), about 310 million years ago.