👉 The term "archeopteryx" is not a known species or organism, but rather a name for the type of dinosaur that lived during the Late Cretaceous period. Archeopteryx was a large, carnivorous dinosaur that lived in North America about 67 to 54 million years ago. It had long, curved legs and a tail-like appendage called the arachnoid. The fossils of archeopteryx have been found in Canada, Mexico