agathaumas ("great wonder") is a dubious genus of a large ceratopsid dinosaur that lived in wyoming during the late cretaceous (65 million years ago). the name comes from greek, "αγαν" - 'much' and "θαυμα" - 'wonder'. it was seen as the largest land animal known at the time of its discovery and might be a synonym of "triceratops". it was related to "ceratops".