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
Macrurosaurus Macrurosaurus Macrurosaurus (meaning "large-tailed lizard") is the name given to a genus of dinosaur from the Early Cretaceous. It was a titanosauriform which lived in what is now Europe. The genus "Macrurosaurus" was named by Harry Govier Seeley in 1869 but not yet described so that it remained a "nomen nudum". In 1876 Seeley described the type species, "Macrurosaurus semnus", making the name valid. No other species are known. The generic name is derived from Greek "makros", "large", and "oura", "tail". The specific name is derived from Greek "semnos", "stately" or "impressive". The holotype of "Macrurosaurus", SM B55630, consists of