Abstract: The first finding of the docodontan (a lower molar of Sibirotherium sp.) from the Bol’shoi Kemchug 3 locality (Ilek Formation, Lower Cretaceous) in Krasnoyarsk Territory is described. Sibirotherium rossicum, one of the youngest docodontans in the geological record, is known from the Ilek Formation of the Shestakovo 1 locality (Kemerovo Region). Previously, only indeterminable remains of docodontans had been found in the localities of the Ilek Formation (Bol’shoi Terekhtyul’ 2 and Bol’shoi Ilek) on Krasnoyarsk Territory.