New leptoceratopsids from the Upper Cretaceous of Alberta, Canada

► Two new leptoceratopsids are described from the Campanian and Santonian of Alberta. ► The Campanian taxon has a unique dentary tooth shape not shared by other leptoceratopsids. ► The Santonian taxon represents the oldest known leptoceratopsid (∼83 Ma). ► The Santonian taxon represents the smallest adult-sized ceratopsian from North America.