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Pachyrhinosaurini was a subfamily of centrosaurine dinosaurs. The clade existed during the Late Cretaceous, about 84.9 to 66 million years ago, evolving during the earliest Campanian,〔 and becoming extinct in the latest Maastrichtian.〔〔 ==Classification== Pachyrhinosaurini was defined in 2012 by Fiorillo & Tykoski. It was defined as "all centrosaurine ceratopsids more closely related to ''Pachyrhinosaurus canadensis'' than to ''Centrosaurus apertus''. It was defined during the description of ''Pachyrhinosaurus petorum'', a species from Alaska〔 Below is a cladogram by Sampson ''et al.'' 2013,〔 with clade names such a Pachyrhinosaurini as defined by Fiorillo and Tykoski (2012).〔 }} |label2=Pachyrhinosaurini |2= }} }} }} }} }} }} }} }} }} }} 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「Pachyrhinosaurini」の詳細全文を読む スポンサード リンク
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