Italiano: Catopsbaatar catopsaloides. Three skulls and dentaries from Hermiin Tsav, Gobi Desert, Mongolia, ?upper Campanian, showing size variation related to the age of individuals.PM120/107 is from Hermiin Tsav I; detailed localization of PIN 4537/4 and PIN 4537/5 is not known. A. PIN 4537/4, incomplete skull of juvenile individual, zygomatic arches and posteriormost part not preserved, in ventral (A1), dorsal (A2), and anterior (A3) views; incomplete left dentary of the same in lateral view (A4), and incomplete right dentary of the same in lateral view (A5). B. PIN 4537/5, almost complete skull of juvenile individual in right lateral (B1), ventral (B2), and dorsal (B3) views; the right dentary of the same in lateral view (B4). C. PM120/107, almost complete skull associated with both dentaries of adult individual in left lateral (C1), right lateral (C2), occipital (C3), ventral (C4), and anterior (C5) views; isolated skull of the same in dorsal view (C6); left dentary of the same in medial (C7) and lateral (C8) views. All in the same scale. Note the tripartite infraorbital foramen (right side of PIN 4537/4, A3); double (right side of PIN 4537/5, B1, B2); and single (both sides of PM 120/107, C1, C2, C5). The structures seen in C3 are explained. For explanation of structures in other figures, see Figs. 2–4, 9, and reconstructions in Figs. 6–8.