Three-dimensional reconstruction of the lower jaw of Siagonodon exigumm sp. nov. based on µ-CT data in lateral (a, c, e) and medial (b, d, f) views. MNRJ 27562 (a–b), MNHN-RA-2023.0001 (c–d), MNRJ 27558 (e–f). Abbreviations: an angular; asf anterior surangular foramen; co coronoid; de dentary; dppd dorsoposterior process of dentary; mf mental foramen; par prearticular lamina of compound bone; qd quadrate; qdf quadrate foramen; rp retroarticular process; sp splenial; spd symphyseal process of dentary.