A New Maastrichtian Species of the Centrosaurine Ceratopsid<i>Pachyrhinosaurus</i>from the North Slope of Alaska

Fiorillo, Anthony R.; Tykoski, Ronald S.

doi:10.4202/app.2011.0033

Cited by 53 publications

(54 citation statements)

References 21 publications

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“…Our results are also largely congruent with those of Xing et al (2014) (Erickson and Druckenmiller 2011;Druckenmiller et al 2013). The Paaŋaqtat fauna is characterized by polar dinosaurian species that are endemic to the Prince Creek Formation, including the pachycephalosaurid Alaskacephale gangloffi (Gangloff et al 2005;Sullivan 2006), the centrosaurine ceratopsid Pachyrhinosaurus perotorum (Fiorillo and Tykoski 2012), and the tyrannosaurid Nanuqsaurus hoglundi (Fiorillo and Tykoski 2014). Additional evidence suggests a potentially unique orodromine and thescelosaurine thescelosaurid (Brown and Druckenmiller 2011;Druckenmiller et al 2013) and a distinct large-toothed species of Troodon (Fiorillo 2008b;Druckenmiller et al 2013) that cannot be referred to any known species from more southerly latitudes.…”

Section: Discussionmentioning

confidence: 99%

An ornithomimosaurian from the Upper Cretaceous Prince Creek Formation of Alaska

Watanabe

Erickson

Druckenmiller

2013

Journal of Vertebrate Paleontology

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Section: Discussionmentioning

confidence: 99%

An ornithomimosaurian from the Upper Cretaceous Prince Creek Formation of Alaska

Watanabe

Erickson

Druckenmiller

2013

Journal of Vertebrate Paleontology

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“…The absence of sauropod remains in these sediments is problematic, because the richest, most-sampled dinosaur faunas on the continent are known from these deposits. Even the Beringian dispersal route between Asia and Laramidia has a growing record of body and trace fossils of dinosaurs and other terrestrial vertebrates of this age (Gangloff et al 2005;Fiorillo 2008;Fiorillo & Adams 2012;Fiorillo & Tykoski 2012. To date, no trace of sauropods has been found in the Beringian corridor connecting the two continents.…”

Section: Palaeobiogeographical Implicationsmentioning

confidence: 99%

An articulated cervical series of Alamosaurus sanjuanensis Gilmore, 1922 (Dinosauria, Sauropoda) from Texas: new perspective on the relationships of North America's last giant sauropod

Tykoski

Fiorillo

2016

Journal of Systematic Palaeontology

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The sauropod dinosaur Alamosaurus sanjuanensis Gilmore, 1922 has been known from Maastrichtian deposits of southwestern North America for nearly a century. Alamosaurus is the youngest sauropod taxon known in North America. Originally described from an isolated scapula and ischium from New Mexico, more of Alamosaurus was revealed by an incomplete skeleton from southern Utah. Additional referred specimens from western Texas provided the first few examples of cervical, dorsal and sacral vertebrae known for the taxon, but these came from relatively small and immature individuals. Here we describe an articulated series of cervical vertebrae of a large, mature titanosaur from Big Bend National Park, Texas, and provide evidence that the specimen can be referred to A. sanjuanensis. The specimen represents the first articulated cervical vertebral series described for the taxon, which clarifies aspects of cervical vertebral anatomy and provides at least one new diagnostic character for Alamosaurus. Many previous cladistic analyses found Alamosaurus to be a saltasaurid titanosaur, sometimes closely related to the Asian taxon Opisthocoelicaudia skarzynskii. We present cladistic analyses incorporating new data from this and other specimens from Big Bend National Park. The first places Alamosaurus as a lithostrotian titanosaur outside Saltasauridae. The second analysis, with greater focus on South American titanosaurs, finds Alamosaurus allied to Lognkosauria, a clade of South American titanosaurs notable for giant size and exceptionally robust necks. This relationship may be more congruent with the fossil record than hypotheses of phylogeny that would require saltasaurid titanosaurs to inhabit northern Laramidia, Beringia and Central Asia through the late Campanian and Maastrichtian while leaving no record of their presence.

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“…; Loewen et al 2010) to Alaska (Pachyrhinosaurus perotorum; Fiorillo and Tykoski, 2012). The Chinese taxon Sinoceratops zhuchengensis (Xu et al, 2010) probably represents a migrant from North America.…”

Section: Introductionmentioning

confidence: 99%

A basal ceratopsid (Centrosaurinae: Nasutoceratopsini) from the Oldman Formation (Campanian) of Alberta, Canada

et al. 2017

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A partial skull (CMN 8804) of a ceratopsid from the upper unit of the Campanian Oldman Formation of Alberta is the first Canadian example of the newly established Nasutoceratopsini, a new subclade of Centrosaurinae defined as the stembased clade of centrosaurine ceratopsids more closely related to Nasutoceratops titusi than to Centrosaurus apertus. The new clade is diagnosed, in part, by having a parietosquamosal frill lacking modified epimarginals; a small nasal horncore; large, rostrolaterally directed postorbital horncores; and a relatively short, deep face. Although the CMN 8804 taxon closely resembles Nasutoceratops, its phylogenetic position within Nasutoceratopsini is unresolved. The CMN 8804 taxon would have been contemporaneous with dinosaurs from the lower portion of the Dinosaur Park Formation 200 km to the northwest in Dinosaur Provincial Park. The presence of the CMN 8804 taxon in Alberta, and the approximately contemporaneous Nasutoceratops in Utah, indicates that the nasutoceratopsins persisted in both north and south Laramidia well after the first appearance (i.e., Coronosaurus brinkmani) of the newly defined Centrosaurini. This stem-based clade is composed of centrosaurine ceratopsids with welladorned parietosquamosal frills and short postorbital horncores that are more closely related to Centrosaurus apertus than Pachyrhinosaurus canadensis. The rarity of nasutoceratopsins in the well-sampled sediments of Laramidia suggests that they may have had different ecological preferences than centrosaurins, or that their relatively non-diagnostic, fragmentary remains may be misidentified as other centrosaurins. The temporally (ϳ79-76 Ma) and geographically (Utah to Alberta) large distributions of Nasutoceratopsini weakens the hypothesis of distinct north and south Laramidian provinciality.Résumé : La boîte crânienne partielle (CMN 8804) d'un cératopsidé de l'unité supérieure de la Formation d'Oldman, du Campanien de l'Alberta, est le premier exemple canadien de Nasutoceratopsini, un nouveau sous-clade de centrosaurinés défini comme étant le clade de tronc de cératopsidés centrosaurinés plus étroitement apparenté à Nasutoceratops titusi qu'à Centrosaurus apertus. Le diagnostic du nouveau clade repose en partie sur la présence d'une frange pariétosquamosale exempte d'ornementation épimarginale modifiée, d'un petit cornillon nasal, de grands cornillons postorbitaux dirigés rostrolatérale-ment et d'une face profonde et relativement courte. Bien que le taxon de CMN 8804 ressemble de près à Nasutoceratops, sa position phylogénétique au sein des Nasutoceratopsini n'est pas résolue. Le taxon de CMN 8804 aurait été contemporain de dinosaures de la partie inférieure de la Formation de Dinosaur Park, à 200 km au nord-ouest, dans le Dinosaur Provincial Park. La présence du taxon de CMN 8804 en Alberta et de Nasutoceratops environ en même temps en Utah indique que les nasutocératopsinés ont persisté tant dans le nord que dans le sud de la Laramidie bien après la première apparition (c.-à -d., Coronosaurus ...

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A New Maastrichtian Species of the Centrosaurine CeratopsidPachyrhinosaurusfrom the North Slope of Alaska

Cited by 53 publications

References 21 publications

An ornithomimosaurian from the Upper Cretaceous Prince Creek Formation of Alaska

An ornithomimosaurian from the Upper Cretaceous Prince Creek Formation of Alaska

An articulated cervical series of Alamosaurus sanjuanensis Gilmore, 1922 (Dinosauria, Sauropoda) from Texas: new perspective on the relationships of North America's last giant sauropod

A basal ceratopsid (Centrosaurinae: Nasutoceratopsini) from the Oldman Formation (Campanian) of Alberta, Canada

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