Image: Ankylosaur caputegulae

Description: Skulls of Ankylosaurus, Euoplocephalus, and Nodocephalosaurus, in left anterolateral view. In Euoplocephalus, the supranarial caputegulum is rugose and forms an arch over the anteriorly placed nasal vestibule. In Ankylosaurus, the nasal vestibule and external naris is roofed by the loreal caputegulum, and the supranarial caputegulum is small and flush with the premaxilla. The holotype of Nodocephalosaurus is poorly preserved in the premaxillary region, but the external nares are also posteriorly placed and may be partly roofed by a ridge-like loreal caputegulum; the supranarial caputegulum is also ridged and projects anteriorly. asca, anterior supraorbital caputegulum; frca, frontal caputegulum; laca, lacrimal caputegulum; loca, loreal caputegulum; mnca, median nasal caputegulum; msca, middle supraorbital caputegulum; mx, maxilla; nasca, nasal caputegulum; nar, external naris; nav, nasal vestibule; nuca, nuchal caputegulum; o, orbit; pmx, premaxilla; psca, posterior supraorbital caputegulum; q, quadrate; qjh, quadratojugal horn; snca, supranarial caputegulum; sqh, squamosal horn.
Title: Ankylosaur caputegulae
Credit: http://www.facetsjournal.com/doi/10.1139/facets-2017-0063
Author: Victoria M. Arbour, Jordan C. Mallon
Usage Terms: Creative Commons Attribution 4.0
License: CC BY 4.0
License Link: https://creativecommons.org/licenses/by/4.0
Attribution Required?: Yes