A new Arctic hadrosaurid from the Prince Creek Formation (lower Maastrichtian) of northern Alaska
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 in...
Published in: | Acta Palaeontologica Polonica |
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Online Access: | https://doi.org/10.4202/app.00152.2015 http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000371323000002 http://fsu.digital.flvc.org/islandora/object/fsu%3A404017/datastream/TN/view/A%20new%20Arctic%20hadrosaurid%20from%20the%20Prince%20Creek%20Formation%20%28lower%20Maastrichtian%29%20of%20northern%20Alaska.jpg |
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ftfloridastunidc:oai:fsu.digital.flvc.org:fsu_404017 2023-05-15T14:56:56+02:00 A new Arctic hadrosaurid from the Prince Creek Formation (lower Maastrichtian) of northern Alaska Mori, Hirotsugu (authoraut) Druckenmiller, Patrick S. (authoraut) Erickson, Gregory M. (authoraut) 1 online resource computer application/pdf https://doi.org/10.4202/app.00152.2015 http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000371323000002 http://fsu.digital.flvc.org/islandora/object/fsu%3A404017/datastream/TN/view/A%20new%20Arctic%20hadrosaurid%20from%20the%20Prince%20Creek%20Formation%20%28lower%20Maastrichtian%29%20of%20northern%20Alaska.jpg English eng eng Acta Palaeontologica Polonica--0567-7920 Text ftfloridastunidc https://doi.org/10.4202/app.00152.2015 2020-08-10T18:22:58Z 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. Alaska, america, Arctic, coastal-plain, Cretaceous, Dinosauria, dinosauria ornithischia, Edmontosaurini, edmontosaurus, Hadrosauridae, high-latitude, ontogeny, ornithopoda, Prince Creek Formation, relative growth, Saurolophinae, slope, USA The publisher’s version of record is available at http://www.dx.doi.org/10.4202/app.00152.2015 Text Arctic Alaska Florida State University Digital Library (FSUDL) Arctic Prince Creek ENVELOPE(-38.067,-38.067,-54.017,-54.017) Acta Palaeontologica Polonica 61 |
institution |
Open Polar |
collection |
Florida State University Digital Library (FSUDL) |
op_collection_id |
ftfloridastunidc |
language |
English |
description |
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. Alaska, america, Arctic, coastal-plain, Cretaceous, Dinosauria, dinosauria ornithischia, Edmontosaurini, edmontosaurus, Hadrosauridae, high-latitude, ontogeny, ornithopoda, Prince Creek Formation, relative growth, Saurolophinae, slope, USA The publisher’s version of record is available at http://www.dx.doi.org/10.4202/app.00152.2015 |
author2 |
Mori, Hirotsugu (authoraut) Druckenmiller, Patrick S. (authoraut) Erickson, Gregory M. (authoraut) |
format |
Text |
title |
A new Arctic hadrosaurid from the Prince Creek Formation (lower Maastrichtian) of northern Alaska |
spellingShingle |
A new Arctic hadrosaurid from the Prince Creek Formation (lower Maastrichtian) of northern Alaska |
title_short |
A new Arctic hadrosaurid from the Prince Creek Formation (lower Maastrichtian) of northern Alaska |
title_full |
A new Arctic hadrosaurid from the Prince Creek Formation (lower Maastrichtian) of northern Alaska |
title_fullStr |
A new Arctic hadrosaurid from the Prince Creek Formation (lower Maastrichtian) of northern Alaska |
title_full_unstemmed |
A new Arctic hadrosaurid from the Prince Creek Formation (lower Maastrichtian) of northern Alaska |
title_sort |
new arctic hadrosaurid from the prince creek formation (lower maastrichtian) of northern alaska |
url |
https://doi.org/10.4202/app.00152.2015 http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000371323000002 http://fsu.digital.flvc.org/islandora/object/fsu%3A404017/datastream/TN/view/A%20new%20Arctic%20hadrosaurid%20from%20the%20Prince%20Creek%20Formation%20%28lower%20Maastrichtian%29%20of%20northern%20Alaska.jpg |
long_lat |
ENVELOPE(-38.067,-38.067,-54.017,-54.017) |
geographic |
Arctic Prince Creek |
geographic_facet |
Arctic Prince Creek |
genre |
Arctic Alaska |
genre_facet |
Arctic Alaska |
op_relation |
Acta Palaeontologica Polonica--0567-7920 |
op_doi |
https://doi.org/10.4202/app.00152.2015 |
container_title |
Acta Palaeontologica Polonica |
container_volume |
61 |
_version_ |
1766328990977490944 |