Palaeognathae is an infraclass of birds, called paleognaths or palaeognaths, It is one of the two infraclasses of birds, the other being Neognathae, both of which form Neornithes. Palaeognathae contai

Lithornithidae is an extinct, possibly paraphyletic group of early paleognath birds. They are known from fossils dating to the Upper Paleocene through the Middle Eocene of North America and Europe, wi