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Nodocephalosaurus
・ Nododelphinulidae
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Nodocephalosaurus : ウィキペディア英語版
Nodocephalosaurus

''Nodocephalosaurus'' is a genus of herbivorous ankylosaurine ankylosaurid dinosaur from Upper Cretaceous (late Campanian stage) deposits of San Juan Basin, New Mexico. The holotype was recovered from the Late Campanian De-na-zin Member of the Kirtland Formation and consists of an incomplete skull. ''Nodocephalosaurus'' (Greek ''nodus'' = knob, ''kephale'' = head and ''sauros'' = lizard) is a monotypic genus, including only the type species, ''Nodocephalosaurus kirtlandensis''. Dinosaurs like ''Nodocephalosaurus'' resembled Asian forms, and may be evidence for Asian dinosaurs migrating to North America in the Late Cretaceous.〔
==Description and classification==

The pattern of cranial ornamentation present in this ankylosaurid "is distinguished by semi-inflated to bulbous, polygonal, cranial osteoderms that are bilaterally and symmetrically arranged on the frontonasal region of the skull",〔 and includes deltoid quadratojugal flanges and pyramid-shaped squamosal bosses.

The type description noted the taxon's similarity to the Monogolian ankylosaurids ''Saichania chulsanensis'' and ''Tarchia gigantea'', and suggested that these three taxa form a clade within the subfamily Ankylosaurinae. However, Vickaryous and others consider this assignment provisional and list the genus as Ankylosaurinae ''incertae sedis''.〔
There is also evidence of a paranasal sinus cavity in the maxilla. Sullivan also noted that material previously collected from the Kirtland Formation and assigned to the taxa ''Euoplocephalus'' or ''Panoplosaurus'' might actually represent additional remains of ''Nodocephalosaurus''.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Nodocephalosaurus」の詳細全文を読む



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