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A new ankylosaurid (Ankylosauria: Dinosauria),  Ziapelta sanjuanensis , gen. et sp. nov., is based on a complete skull, an incomplete first cervical half ring, a possible fragment of the second cervical half ring, and additional fragmentary osteoderms. The holotype specimen is from the Upper Cretaceous (Upper Campanian, Kirtlandian Land-Vertebrate Age) Kirtland Formation (De-na-zin Member) at Hunter Wash, San Juan Basin, in northwestern New Mexico, USA. Diagnostic characters of  Ziapelta  include: a large, prominent triangular median nasal caputegulum; a mixture of flat and bulbous frontonasal caputegulae; ventrolaterally oriented squamosal horns with a sharp, prominent dorsal keel; and the ventral surface of basicranium with three prominent anteroposteriorly oriented fossae. A phylogenetic analysis suggests that  Ziapelta  is not closely related to the other ankylosaurid from the De-na-zin Member,  Nodocephalosaurus , but allies it to the northern North American ankylosaurids  Ankylosaurus ,  Anodontosaurus ,  Euoplocephalus ,  Dyoplosaurus , and  Scolosaurus .

plos one

A New Ankylosaurid Dinosaur from the Upper Cretaceous (Kirtlandian) of New Mexico with Implications for Ankylosaurid Diversity in the Upper Cretaceous of Western North America