[D] Nodocephalosaurus kirtlandensis [Su] [sG] [T]
Cretaceous Late Campanian
Ornithischia Thyreophora Eurypoda Ankylosauria Ankylosauridae
Kirtland Formation, San Juan Basin, New Mexico, US
Genus - Typespecies - Skull
Kirkland, J. I., Lucas, S. G. & Estep, J. W., 1998. \\\\\\\"Cretaceous Dinosaurs of the Colorado Plateau,\\\\\\\" in Lucas, Kirkland, & Estep, J. W., eds., 1998: \\\\\\\"Nodocephalosaurus kirtlandi\\\\\\\" Sullivan (in press) Official described by Sullivan in 1999 as N. kirtlandensis
A partial skull of a new ankylosaurid dinosaur, Nodocephalosaurus kirtlandensis gen. et sp. nov., differs from known ankylosaurids in possessing a distinctive post- maxillary/lacrimal (osteoderm) ridge and a prominent quadratojugal protuberance that projects anteroventrally.
Furthermore, it is distinguished by semi-inflated to bulbous, polygonal, cranial osteoderms that are bilaterally and symmetrically arranged on the frontonasal region of the skull, similar to the Asian ankylosaurids Saichania chulsanensis and Tarchia gigantea. Nodocephalosaurus kirtlandensis and these Asian genera are thus interpreted as composing a clade within the Ankylosauridae.
Nodocephalosaurus kirtlandensis is from the Upper Cretaceous Kirtland Formation, De-na-zin Member, now considered to be late Campanian in age. Previously collected ankylosaurid material, from the Kirtland Formation, may pertain to this taxon rather than Euoplocephalus or Panoplosaurus, but this cannot be determined with certainty
[Abstract: Sullivan, RM, (1999) Journal of Vertebrate Paleontology, 19(1): 126 Nodocephalosaurus kirtlandensis, gen. et. sp nov., a new ankylosaurid dinosaur (Ornithischia : Ankylosauria) from the Upper Cretaceous Kirtland Formation (upper Campanian), San Juan Basin, New Mexico]