Inostrancevia is a Gorgonpsid from the Permian. Like all Gorgonpsid they where Synapsids and had both mammal and reptilian features. They can mark there territory like mammals with specialize glens behind the back jaw. They lived mostly alone so they are solitary hunters. They did not have as big enough canines like the Gorgonops but it is still big enough to slice there prey.