Extended Data Fig. 1: Diagnostic and phylogenetically significant characters of Khankhuuluu. Autapomorphies of Khankhuuluu in yellow.

Synapomorphies of Khankhuuluu+Eutyrannosauria or characters restricted to Eutyrannosauria in magenta. Nasals of Khankhuuluu MPC-D 100/50 (1a, 2a) and Gorgosaurus ROM 1247 (1b, 2b) in dorsal (1a, b) and ventral (2a, b) views. Quadratojugals of Khankhuuluu (3a) and Daspletosaurus (3b). Scapulocoracoid of Khankhuuluu MPC-D 100/50 (4a) and Albertosaurus TMP 1986.064.0001 (4b). Quadrates of Khankhuuluu MPC-D 100/50 (5a) and MPC-D 100/51 (6a) and Gorgosaurus TMP 1986.144.0001 (5b and 6b) in lateral (5) and posterior (6) views. Distal tibia of Khankhuuluu MPC-D 100/51 (7a) and Albertosaurus TMP 1986.064.0001 (7b) in anterior view. Scale bars = 5 cm. Abbreviations: aco, astragalar contact orientation changes across angle (unambiguous synapomorphy); edp, expanded dorsal process of quadratojugal; lcp, lacrimal cornual process; mfp, medial frontal process; npr, small nasal pneumatic recess present; nr, nasal rugosities; qf, quadrate foramen; qjc, quadratojugal contact medial margin; qr, quadrate recess; qrwa, quadrate recess aperture medial wall absent; qrwp, quadrate recess aperture medial wall present; sad, deep subacromial depression; sfp, supernumerary frontal processes present medial frontal process absent; sgf, subglenoid fossa ventral face present.