Eric Walker added Lystrosaurus - Wikipedia to Lystrosaurus
Eric Walker added 250 Million Years Ago, They Hibernated at the Bottom of the World - The New York Times and Lystrosaurus - Wikipedia to Lystrosaurus, and added Lystrosaurus to Lystrosauridae
Eric Walker added Lystrosaurus to Lystrosauridae, and added Lystrosauridae to Dicynodontia