Although it was briefly mixed up with hadrosaurs, and even considered to be a possible synonym of Trachodon, it was recognized as a horned dinosaur in time for the first monograph on horned dinosaurs (1907), wherein it was regarded as based on indeterminate material. Today, the name is used as little more than a historical curiosity, as it dates from a time before horned dinosaurs were known to exist.
Although initially mistaken for hadrosaurs and even considered a possible synonym of Trachodon, this dinosaur was eventually recognized as a member of the horned dinosaur group in 1907, when its classification was based on uncertain evidence. Today, it is mostly viewed as an historical curiosity because it predates our understanding of horned dinosaurs.