Fig. 5 in A unique dentary suggests a third genus of batrachosauroidid salamander existed during the latest Cretaceous in the western USA

Fig. 5. Referred dentaries of other, paracontemporaneous (upper Maastrichtian) batrachosauroidid salamanders from the North American Western Interior. A–C. Opisthotriton kayi Auffenberg, 1961. A. Posteriorly incomplete left dentary, UW 14575, from Robber's Roost, Lance Formation, Wyoming, USA, in lingual (A1) and lingual and slightly dorsal (A2) views. B. Nearly complete left dentary, UALVP 12093, from Bushy Tailed Blowout, Lance Formation, Wyoming, USA, lingual views of complete specimen (B1) and detail of anterior end (B2), the latter with arrow denoting slightly constricted zone of weakness between pedicel and crown typical of subpedicellate teeth. C. Posteriorly incomplete right dentary, UALVP 60835, from Wounded Knee, Frenchman Formation, Saskatchewan, Canada, lingual views of complete specimen (C1) and detail of anterior end (C2). D, E. Prodesmodon copei Estes, 1964. D. Anteriorly incomplete left dentary, UALVP 12092, from Bushy Tailed Blowout, Lance Formation, Wyoming, USA, in lingual view. E. Posteriorly incomplete left dentary, UALVP 39928, from Bushy Tailed Blowout, Lance Formation, Wyoming, USA, in lingual (E1) and ventral (E2) views. The three O. kayi dentaries (A–C) each bear a shallow pit in approximately the same position as the flattened and shallowly concave knob in AMNH FARB 22965, whereas the more anteriorly complete Pro. copei dentary (E) bears a convex knob positioned more ventrolabially relative to the potentially homologous pit in O. kayi and the flattened and shallowly concave knob in AMNH FARB 22965. Also note how many of the incomplete teeth in the three O. kayi dentaries (A–C) are broken at the same level, along the plane of weakness between the crown and pedicel, whereas nonpedicellate teeth in the two Pro. copei dentaries (D, E) are broken at various positions along the basal-apical lengths of the teeth. All images are photographs, with specimens lightly dusted with ammonium chloride to enhance surface details.