A new Arctic hadrosaurid from the Prince Creek Formation (lower Maastrichtian) of northern Alaska

• Autorzy: Mori H. , Druckenmiller P.S. , Erickson G.M.
• Języki publikacji: EN

Abstrakty

EN

The Liscomb bonebed in the Price Creek Formation of northern Alaska has produced thousands of individual bones of a saurolophine hadrosaurid similar to Edmontosaurus; however, the specific identity of this taxon has been unclear, in part because the vast majority of the remains represent immature individuals. In this study, we address the taxonomic status of the Alaskan material through a comparative and quantitative morphological analysis of juvenile as well several near adult-sized specimens with particular reference to the two known species of Edmontosaurus, as well as a cladistic analysis using two different matrices for Hadrosauroidea. In the comparative morphological analysis, we introduce a quantitative method using bivariate plots to address ontogenetic variation. Our comparative anatomical analysis reveals that the Alaskan saurolophine possesses a unique suite of characters that distinguishes it from Edmontosaurus, including a premaxillary circumnarial ridge that projects posterolaterally without a premaxillary vestibular promontory, a shallow groove lateral to the posterodorsal premaxillary foramen, a relatively narrow jugal process of the postorbital lacking a postorbital pocket, a relatively tall maxilla, a relatively gracile jugal, a more strongly angled posterior margin of the anterior process of the jugal, wide lateral exposure of the quadratojugal, and a short symphyseal process of the dentary. The cladistic analyses consistently recover the Alaskan saurolophine as the sister taxon to Edmontosaurus annectens + Edmontosaurus regalis. This phylogenetic assessment is robust even when accounting for ontogenetically variable characters. Based on these results, we erect a new taxon, Ugrunaaluk kuukpikensis gen. et sp. nov. that contributes to growing evidence for a distinct, early Maastrichtian Arctic dinosaur community that existed at the northernmost extent of Laramidia during the Late Cretaceous.

Słowa kluczowe

EN

new species; Arctic; hadrosaurid; Dinosauria; Hadrosauridae; Saurolophinae; Edmontosaurini; ontogenesis; Cretaceous; Prince Creek Formation; Maastrichtian; Alaska

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2016
• Tom: 61
• Numer: 1
• Opis fizyczny: p.15-32,fig.,ref.

Twórcy

autor

Mori H.

• Department of Geosciences, University of Alaska Fairbanks, 900 Yukon Drive, Fairbanks, AK 99775-5780, USA
• University of Alaska Museum, 907 Yukon Drive, Fairbanks, AK 99775, USA
• Saikai City Board of Education; Setoitanoura Go, Oseto Cho, Saikai City, Nagasaki Prefecture, 857-2301, Japan

autor

Druckenmiller P.S.

• University of Alaska Museum, 907 Yukon Drive, Fairbanks, AK 99775, USA
• Department of Geosciences, University of Alaska Fairbanks, 900 Yukon Drive, Fairbanks, AK 99775-5780, USA

autor

Erickson G.M.

• Department of Biological Science, Florida State University, 319 Stadium Drive, Tallahassee, FL 32306-4295, USA

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Identyfikatory

DOI

10.4202/app.00152.2015