Palaeovaranus

Palaeovaranus is an extinct genus of varanoid lizards from the Late Eocene of France and Germany. It contains two species, "Palaeovaranus cayluxensis" and "Palaeovaranus giganteus" (formerly assigned to a separate genus "Melanosauroides"). The genus was first named by Henri Filhol in 1877, but he had named the species "Palaeovaranus cayluxi" earlier as "Palaeosaurus cayluxi" in 1873, and as "Necrosaurus cuxleyi" in 1876 after it was discovered that "Palaeosaurus" was preoccupied. However, he failed to provide any kind of valid description, which renders Karl Alfred Ritter von Zittel's 1887 description of the taxon as the valid authority on its validity. Despite this, the name "Necrosaurus" was widely used in the literature afterwards.