Skeletal diagram of the lectotype AMNH 6554 of the medium-sized tyrannosauroid Alectrosaurus olseni, known from the Iren Dabasu Formation in Inner Mongolia.[1][2] Though a large number of specimens have been referred to this genus, including cranial and hindlimb material from the Bayan Shireh Formation, none of these specimens can be safely attributed as there are no reliable redescriptions and/or analyses.[2][3][4] Color Key   Known   Known but unfigured   Unknown