“…3.1-3.6) is completely preserved and possesses a less-eroded bone surface than the radius. The ulna is elongate as in other hadrosaurids, but considerably more gracile than the corresponding element in other taxa (e.g., Brown, 1913;Parks, 1919Parks, , 1922Parks, , 1923Pinna, 1979;Godefroit et al, 2001Godefroit et al, , 2004Godefroit et al, , 2012aPrieto-Márquez et al, 2006Evans and Reisz, 2007;Senter, 2012;Prieto-Márquez, 2014;Anné et al, 2016;Kobayashi et al, 2019), with the exception of many hadrosauromorphs (e.g., Gilmore, 1933;Dalla Vecchia, 2009;Prieto-Márquez and Norell, 2010;McDonald et al, 2012;Tsogtbaatar et al, 2019). The ulna gently expands proximally in anterior and posterior views.…”