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Comparisons of anterior right vomers of Bolg amondol (A) and selected monstersaur taxa. (B) Right vomer of IGM 3/14 (holotype, Estesia mongoliensis, modified from [5]). (C) Right vomer of UF 153328 (Heloderma horridum). (D) Right vomer of Gobiderma pulchrum, modified from [12]. Anatomical abbreviations: ac, articular crest; evf, external vomeronasal fenestra; frm, foramen; vc, ventral crest.
