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. 2025 Jun 18;12(6):250435. doi: 10.1098/rsos.250435

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© 2025 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Comparisons of the medial subdental margin (depicted in white) on the dentaries of monstersaurian taxa — Comparisons of the medial subdental margin (depicted in white) on the dentaries of monstersaurian taxa. (A) Reconstructed left dentary of Bolg amondol, upper Campanian Kaiparowits Formation (Fm), Utah, USA, using a mirrored image of the right dentary fragment UMNH VP 16266.6. (B) Left dentary ANSP 18664 (holotype, Labrodioctes montanaensis, upper Campanian Oldman Fm, Alberta,Canada, modified from [7]. (C) Left dentary span >MNHAH D1049652 (holotype, Morohasaurus kamitakiensis, lower Albian Ohyamashimo Formation, Japan, modified from [15]. (D) Left dentary OMNH 27750 (referred specimen, Primaderma nessovi, Cenomanian Mussentuchit Member, Cedar Mountain Fm, Utah, USA, modified from [10]. (E) Right dentary (reflected for comparison) TMP 1989.121.0001 (referred specimen, Palaeosaniwa canadensis, upper Campanian Oldman Fm, Alberta, Canada, modified from [7]. (F) Left dentary UALVP 29845 (referred specimen, Paraderma bogerti, Maastrichtian Scollard Fm, Alberta, Canada, modified from [7]. (G) Left dentary IGM 3/14 (holotype, Estesia mongoliensis, Campanian Djadokhta Fm, Mongolia, modified from [5]. (H) Left dentary TMM-M 9001 (referred specimen, Heloderma suspectum, modern, modified from [19]. (I) Left dentary SDSNH 59469 (referred specimen, Heloderma horridum, modern, modified from [19]. (J) Right dentary (reflected for comparison) BMNHR 3487 (referred specimen, Eurheloderma gallicum, Eocene Phosphorites du Quercy, France, modified from [16]. (K) Left dentary IGM 3/55 (referred specimen, Gobiderma pulchrum, Campanian Djadokhta Fm, Mongolia, modified from [12].