1991 in paleontology

Archosauromorphs

 * Sankar Chatterjee's discovery of a possible Triassic bird, Protoavis, if genuine, would push avian origins back almost 70 million years. The find ignites controversy over the connection between dinosaurs and birds.

Newly named dinosaurs
Data courtesy of George Olshevsky's dinosaur genera list.

Genera no longer considered to be birds

 * Protoavis. The avian status of Protoavis has since been almost universally rejected by paleontologists.