Genre
Valide Éteint

Nodocephalosaurus

Sullivan 1999

Nodocephalosaurus est un genre fossile de dinosaure ankylosaure du Campanien découvert dans le bassin de San Juan, au Nouveau-Mexique. L'holotype a été trouvé dans la partie appelée De-na-zin de la formation de Kirtland, dans le bassin de San Juan, datée du Campanien supérieur. Il s'agit d'un crâne incomplet. Le genre Nodocephalosaurus est monotypique : on ne lui connaît que l'espèce type, Nodocephalosaurus kirtlandensis. Nodocephalosaurus ressemble à des dinosaures asiatiques et pourrait être un indice de migrations de dinosaures d'Asie vers l'Amérique du Nord au Crétacé supérieur.

Plage temporelle
Trias
Jurassique
Crétacé
Paléogène
Néogène
252 201 145 66 0 Ma
Occurrences PBDB
6
Groupe
Dinosaures
Herbivore Vivant au sol, grégaire Terrestre
Nodocephalosaurus
cliquer pour agrandir
Comparison of cranial features between closely related southern Laramidian taxa; (A), Akainacephalus johnsoni (UMNH VP 20202) from the Late Cretaceous Kaiparowits Formation of Utah; and (B), Nodocephalosaurus kirtlandensis (SMP VP-900) from the Late Cretaceous Kirtland Formation of New Mexico, in left lateral views. Various synapomorphies are shared with N. kirtlandensis (highlighted in black and white arrows) and includes “flaring nostrils”; enlarged, laterally projecting, loreal osteoderms that are situated directly dorsal to the external nares. Other synapomorphies include pyramid-shaped nasal and frontal osteoderms positioned on the dorsal regions of the skull. A number of significant differences have been observed between both specimens; in A. johnsoni, the anterior, and posterior supraorbital bosses form an enlarged element that is somewhat backswept, whereas in N. kirtlandensis, the posterior and anterior supraorbital bosses are clearly defined as individual osteoderms, and are much smaller in size. Additionally, the squamosal horn in Akainacephalus is very small but is prominent and tetrahedrally shaped in Nodocephalosaurus. The quadratojugal horn in Akainacephalus is massive, has a subtriangular morphology in lateral view and projects almost entirely ventral, whereas in Nodocephalosaurus, the quadratojugal horn is smaller and has a typical fin-shaped morphology. Study sites: asob, anterior supraorbital boss; ext naris, external naris; laca, lacrimal caputegulum; loca, loreal caputegulum; naca, nasal caputegulae; orb, orbit; psob, posterior supraorbital boss; qjh, quadratojugal horn; sqh, squamosal horn. © Jelle P. Wiersma​, Randall B. Irmis · CC BY-SA 4.0 · Wikimedia

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PBDB ↗ Wikipedia ↗
Classification
Dinosauria Clade non classé
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Ornithischia Clade non classé
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Parapredentata Clade non classé
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Saphornithischia Clade non classé
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Prionodontia Clade non classé
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Genasauria Clade non classé
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Thyreophora Clade non classé
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Thyreophoroidea Superfamille
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Eurypoda Clade non classé
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Ankylosauria Clade non classé
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Euankylosauria Clade non classé
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Ankylosauridae Famille
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Ankylosaurinae Sous-famille
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Nodocephalosaurus Genre
Sites de découverte 6 sites géolocalisés
Répartition
Principaux pays
🇺🇸 États-Unis
6
Formations géologiques
Kirtland
6
Distribution temporelle
Campanien (83.6–72.2 Ma)
6
Espèces (1)
Nodocephalosaurus kirtlandensis 84 Ma
Images 1
Bibliographie
Description originale
R. M. Sullivan. 1999. 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. Journal of Vertebrate Paleontology 19(1):126-139 DOI ↗
Bibliographie (3)
M. E. Burns and R. M. Sullivan. 2011. The tail club of Nodocephalosaurus kirtlandensis (Dinosauria: Ankylosauridae), with a review of ankylosaurid tail club morphology and homology. Fossil Record 3. New Mexico Museum of Natural History and Science Bulletin 53:179-186
R. M. Sullivan and D. W. Fowler. 2006. New specimens of the rare ankylosaurid dinosaur Nodocephalosaurus kirtlandensis (Ornithischia: Ankylosauridae) from the Upper Cretaceous Kirtland Formation (De-na-zin Member), San Juan Basin, New Mexico. Late Cretaceous Vertebrates from the Western Interior. New Mexico Museum of Natural History and Science Bulletin 35:259-261
R. M. Sullivan. 1999. 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. Journal of Vertebrate Paleontology 19(1):126-139 DOI ↗