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Euoplocephalus tutus and the Diversity of Ankylosaurid Dinosaurs in the Late Cretaceous of Alberta, Canada, and Montana, USA

Figure 5

Skulls in lateral view.

Skulls from Alberta appear above the horizontal line, and skulls from Montana below the line. The left column of skulls from Alberta includes skulls without postocular caputegulae around the base of the squamosal and quadratojugal horns, in right lateral view (AMNH 5337, AMNH 5404, AMNH 5405, ROM 1930, TMP 1991.127.1, and UALVP 31). The right column of skulls from Alberta includes skulls with postocular caputegulae around the base of the squamosal and quadratojugal horns, in left lateral view (AMNH 5238, CMN 8530 (Anodontosaurus lambei holotype), NHMUK R4947, ROM 832, TMP 1997.59.1, TMP 1997.132.1. Below the horizontal line are skulls from Montana (MOR 433 (Oohkotokia horneri holotype), NSM PV 20381, TMP 2001.42.9, and USNM 11892). The anterior rostrum of TMP 2001.42.9 and NSM PV 20381 are heavily reconstructed. AMNH 5404, AMNH 5405, and TMP 1991.127.1 are mirrored left lateral views, and AMNH 5238 is a mirrored right lateral view. Photograph of NSM PV 20381 by T. Miyashita and used with permission. Scale equals 10 cm. Abbreviations: asca, anterior supraorbital caputegulum; co, ciliary osteoderm; laca, lacrimal caputegulum; loca, loreal caputegulum; mx, maxilla; nar, naris; nasca, nasal caputegulum; orb, orbit; pmx, premaxilla; pnca, postnarial caputegulum; poca, postocular caputegulum; psca, posterior supraorbital caputegulum; pt, pterygoid; qjh, quadratojugal horn; snca, supranarial caputegulum; sqh, squamosal horn.

Figure 5

doi: https://doi.org/10.1371/journal.pone.0062421.g005