PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Ziapelta sanjuanensis

Reptilia - Ankylosauridae

Taxonomy

Ziapelta sanjuanensis was named by Arbour et al. (2014). Its type specimen is NMMNH P-64484, a partial skeleton, and it is a 3D body fossil. Its type locality is NMMNH L-8514, Hunter Wash, which is in a Campanian terrestrial horizon in the Kirtland Formation of New Mexico.

Year	Name and author
2014	Ziapelta sanjuanensis Arbour et al. p. 4 fig. 2–4a,b
2015	Ziapelta sanjuanensis Burns and Lucas p. 11
2015	Ziapelta sanjuanensis Jasinski p. 79
2016	Ziapelta sanjuanensis Arbour and Currie p. 422
2017	Ziapelta sanjuanensis Arbour and Mallon p. 772
2018	Ziapelta sanjuanensis Penkalski p. 264

Reference	Diagnosis
V. M. Arbour et al. 2014	Ziapelta is unique among ankylosaurids in having the following features: prominent, large, sub-triangular median nasal caputegulum; dorsoventrally deep squamosal horns curved anteriorly at the tips; three deep fossae on the ventral surface of the basicranium. Differs from other ankylosaurids in possessing a mixture of flat and weakly bulbous frontonasal caputegulae. Differs from Nodocephalosaurus kirtlandensis in the irregular basal shape of the frontonasal caputegulae and in the manner in which the caputegulae are bulbous (conical in Nodocephalosaurus, irregularly convex in Ziapelta), and the shape of the squamosal horns, which have a sharper, more prominent dorsal keel. Distal osteoderm of the cervical half ring does not envelop the terminus of the underlying bony band, unlike the condition in Ankylosaurus magniventris, Anodontosaurus lambei, Euoplocephalus tutus, and Scolosaurus cutleri.
V. M. Arbour and P. J. Currie 2016	Ankylosaurine ankylosaurid with bulbous cranial ornamentation. Unlike other ankylosaurs, squamosal horn has unique smooth-textured keel offset from the rest of the squamosal horn by a distinct and abrupt change to a granular texture; elaborate pattern of postocular caputegulae covering entire postocular region between squamosal and quadratojugal horns, with more postocular caputegulae than Anodontosaurus lambei, Saichania chulsanensis or Tarchia kielanae.