Ennatosaurus (meaning "the 9th reptile") was a synapsid that lived in European Russia during the Wordian stage of the Permian period. It is included in the synapsid clade Caseidae in the order Pelycosauria. Ennatosaurus was herbivorous, possibly using its broad forefeet to dig at plants. Like all caseids, Ennatosaurus had a small head compared to its wide, lizard-like body. Its mouth was lined with blunt, peg-like teeth. It lived alongside other Permian creatures, such as the herbivorous Nyctiphruretus and the carnivorous Biarmosuchus.