Shahararren masanin ilimin halittu Barnum Brown ya dawo da kwanyar duckbill a 1915 don Gidan Tarihi na Tarihi na Tarihi na Amurka (AMNH 5836) daga Kogin Red Deer na Alberta, kusa da Steveville. Ya bayyana samfurin a 1916 a matsayin sabon jinsi, Prosaurolophus. Zaɓin sunan Brown ya fito ne daga kwatankwacin jinsin Saurolophus, wanda ya bayyana a 1912. Saurolophus yana da irin wannan, amma ya fi tsayi kuma ya fi kama da spike-like kai. kwanyar tana da ƙwanƙwasa mai lalacewa kuma an sake gina shi da daɗewa, amma ba da daɗewa ba an sami ragowar mafi kyau wanda ya nuna ainihin siffar; daya shine kusan kwarangwal da kwanyar kwanyar kwanyar, wanda William Parks ya bayyana a 1924.
Kogin Red Deer