Laopteryx Laopteryx Laopteryx is the name assigned to a pterosaur (flying reptile) from the Upper Jurassic Morrison Formation of Wyoming, United States; it was originally thought to be a bird. The genus was named in 1881 by Othniel Charles Marsh. The generic name is derived from Greek "laas", "stone", and "pteryx", "wing". The full species name given by Marsh was "Laopteryx priscum"; the specific name meaning "of venerable age" in Latin. However, Marsh incorrectly used the neuter form, while "pteryx" is feminine in Greek. (See grammatical gender.) This was in the 19th century emended to an, also incorrect, masculine "priscus" and
Therizinosaurus Therizinosaurus Therizinosaurus (; 'scythe lizard', from the Greek "therizo" meaning 'rake' or 'to cut off' and "sauros" meaning 'lizard') is a genus of very large theropod dinosaurs. "Therizinosaurus" comprises the single species T. cheloniformis, which lived in the late Cretaceous Period (early Maastrichtian stage, around 70 million years ago), and was one of the last and largest representatives of its unique group, the Therizinosauria. Fossils of this species were first discovered in Mongolia and were originally thought to belong to a turtle-like reptile (hence the species name, "T. cheloniformis" – "turtle-formed"). It is known only from a few bones, including