Neosaurus is an extinct genus of pelycosaur-grade synapsids from the Late Carboniferous-Early Permian of the Jura region of France. It is known only from a partial maxilla or upper jaw bone and an associated impression of the bone.
The Neosaurus was an extinct species of pelycosaur-like mammal, living during the late Carboniferous and early Permian periods in the Jura region of France.  It has been discovered through a partial maxilla (upper jaw) bone and its associated imprint.