Diplocaulus (meaning "double stalk") was not a dinosaur but an early amphibian, now extinct.

However, in early amphibians the stapes was too large, making the footplate area oversized, preventing the hearing of high frequencies.

The period also saw the demise of the Ichthyostegalia, the early fish-like amphibians with more than five digits.

Oklahoma was home a variety of insects as well as early amphibians and reptiles.

Altenglanerpeton belongs to a group of early amphibians called microsaurs, characterized by their small size and simple vertebrae.

The gastralia may have been involved in the breathing process in early amphibians and reptiles.

The earliest amphibians were certainly predators, and there was suitable prey both on land and in the water.

Based on his research of early amphibians, he reorganised the labyrinthodontians.

It was not the dinosaurs that concerned him, nor the earlier amphibians, nor all the other creatures that moved in time about the hills.

For example, tooth rows on the palate have evolved multiple times independently in early amphibians.