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Article ; Online: Paleobiological inferences from paleopathological occurrences in the Arctic ceratopsian Pachyrhinosaurus perotorum.

Fiorillo, Anthony R / Tykoski, Ronald S

Anatomical record (Hoboken, N.J. : 2007)

2022 Volume 306, Issue 7, Page(s) 1697–1711

Abstract: As a key tool for understanding how animals lived in the past, paleopathology informs us about the lives and deaths of fossil animals. We identify paleopathologies within an assemblage of bones of the pachyrostran centrosaurine Pachyrhinosaurus perotorum, ...

Abstract	As a key tool for understanding how animals lived in the past, paleopathology informs us about the lives and deaths of fossil animals. We identify paleopathologies within an assemblage of bones of the pachyrostran centrosaurine Pachyrhinosaurus perotorum, an Arctic ceratopsian. More than 1,000 bones of this dinosaur were collected from the Prince Creek Formation of North Slope, Alaska from fossil sites along the Colville River. Our survey shows the occurrence of paleopathology to be very low and comparable to other populations of horned dinosaurs from the lower latitudes, suggesting that the ancient Arctic environment did not impose intense hardships on these dinosaurs greater than in other environments, as expressed by paleopathological modification of the skeleton. This result may be due to the more equable mean annual temperatures in the Arctic region during the Cretaceous. Also of interest, the frequency of occurrence of paleopathology in the Arctic Pachyrhinosaurus population is very low compared to populations of fossil and historic quadrupedal artiodactyls that are recognized as long distance wanderers.
MeSH term(s)	Animals ; Arctic Regions ; Dinosaurs/anatomy & histology ; Fossils ; Bone and Bones/anatomy & histology ; Alaska
Language	English
Publishing date	2022-10-22
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
ZDB-ID	2269667-2
ISSN	1932-8494 ; 1932-8486
ISSN (online)	1932-8494
ISSN	1932-8486
DOI	10.1002/ar.25104
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Article ; Online: Evolutionary insights from an anatomical network analysis of the hyolaryngeal apparatus in extant archosaurs (birds and crocodilians).

Yoshida, Junki / Kobayashi, Yoshitsugu / Fiorillo, Anthony R

Anatomical record (Hoboken, N.J. : 2007)

2023 Volume 306, Issue 7, Page(s) 1631–1645

Abstract: Adaptive radiation of archosaurs, represented by crocodilians, non-avian dinosaurs, and birds, since the Mesozoic has been studied mainly based on their major skeletal elements (skull, vertebrae, and limbs). However, little is known about the evolution ... ...

Abstract	Adaptive radiation of archosaurs, represented by crocodilians, non-avian dinosaurs, and birds, since the Mesozoic has been studied mainly based on their major skeletal elements (skull, vertebrae, and limbs). However, little is known about the evolution of their hyolaryngeal apparatus, which is involved with feeding, respiration, and vocalization, because of poor fossil preservation and the difficulty in determining the musculoskeletal homology of the apparatus. Network analysis is a framework to quantitatively characterize the topological organization of anatomical structures for comparing structural integration and modularity regardless of ambiguous homology. Herein, we modeled the musculoskeletal system of hyolarynx in six species of extant archosaurs and its sister-taxon turtle, and conducted a network analysis using network parameters, modular partition, and bone centrality in a phylogenetic framework. The network parameters reveal that ancestral archosaurs have reduced the numbers of elements and links and acquired complex networks as a whole domain with strong modularity in the hyolarynx. Furthermore, the modular partition and centrality reveal that the hyoids are highly evolvable, while the larynx is constrained and less evolvable. The archosaur hyolarynx exhibits different evolutionary trends: crocodilians with the system integration, basihyal simplification, and ceratobranchial centralization; and birds with the simplicity, weak integration, and modularity of the hyolarynx, laryngeal integration with cricoid centrality, and tongue-module expansion with the acquisition of paraglossal. Four hyolaryngeal bones (ceratobranchial, basihyal, paraglossal, and cricoid) have played important roles in archosaur evolution, and their fossil records are keys to understanding the two major archosaur lineages toward crocodilians and birds.
MeSH term(s)	Animals ; Phylogeny ; Biological Evolution ; Alligators and Crocodiles ; Skull/anatomy & histology ; Dinosaurs ; Birds
Language	English
Publishing date	2023-01-03
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2269667-2
ISSN	1932-8494 ; 1932-8486
ISSN (online)	1932-8494
ISSN	1932-8486
DOI	10.1002/ar.25153
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Article ; Online: Introduction to Dinosaurs: New Ideas from Old Bones papers honoring Peter Dodson.

Fiorillo, Anthony R / Forster, Catherine A / Weishampel, David B

Anatomical record (Hoboken, N.J. : 2007)

2023 Volume 306, Issue 7, Page(s) 1595–1601

Abstract: This special volume of The Anatomical Record honors the life-long commitment to anatomy and paleontology by Professor Peter Dodson (Emeritus, University of Pennsylvania). Peter's legacy is not only rooted in his own research interests, but also in the ... ...

Abstract	This special volume of The Anatomical Record honors the life-long commitment to anatomy and paleontology by Professor Peter Dodson (Emeritus, University of Pennsylvania). Peter's legacy is not only rooted in his own research interests, but also in the wealth of former students he mentored over his career, many of whom have made their own new contributions to the fields of anatomy and paleontology through original scientific investigation. Within these 18 scientific papers, which cover multiple taxa, multiple continents, and multiple methodologies, each of the contributors brought to this volume their own unique work that can be traced back to some form of inspiration by the honoree.
MeSH term(s)	Animals ; Dinosaurs/anatomy & histology ; Paleontology ; Humans
Language	English
Publishing date	2023-05-13
Publishing country	United States
Document type	Biography ; Introductory Journal Article
ZDB-ID	2269667-2
ISSN	1932-8494 ; 1932-8486
ISSN (online)	1932-8494
ISSN	1932-8486
DOI	10.1002/ar.25241
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Article ; Online: Illuminating dinosaurs under the aurora borealis-A commentary on the creation of the Arctic cover for Dinosaurs: New Ideas from Old Bones.

Hartstone-Rose, Adam / Berger, Arin / Tuman, Mot / Fiorillo, Anthony R

Anatomical record (Hoboken, N.J. : 2007)

2023 Volume 306, Issue 7, Page(s) 1611–1617

MeSH term(s)	Animals ; Dinosaurs/anatomy & histology ; Bone and Bones ; Fossils
Language	English
Publishing date	2023-04-19
Publishing country	United States
Document type	Journal Article
ZDB-ID	2269667-2
ISSN	1932-8494 ; 1932-8486
ISSN (online)	1932-8494
ISSN	1932-8486
DOI	10.1002/ar.25226
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Article: Permian lobed Zoophycos as the product of the terrestrialization process: Behavioral innovation in the Tahkandit Limestone (Yukon River, Alaska, USA)

Fiorillo, Anthony R. / Fanti, Federico / Baucon, Andrea / Chiarenza, Alfio Alessandro

Palaeogeography, palaeoclimatology, palaeoecology. 2022 May 01, v. 593

2022

Abstract: Paleontological survey in the remote Yukon-Charley Rivers National Preserve in Alaska led to the discovery of lobed Zoophycos from the lower Tahkandit Limestone (informally named Sandstone unit), an interval characterized by grayish-green glauconitic ... ...

Abstract	Paleontological survey in the remote Yukon-Charley Rivers National Preserve in Alaska led to the discovery of lobed Zoophycos from the lower Tahkandit Limestone (informally named Sandstone unit), an interval characterized by grayish-green glauconitic sandstone and conglomerate of coastal origin. The studied Zoophycos consists of a lobate skirt-like spreite bounded by a marginal tube. Smaller tongue-shaped lobes branch off from larger parent lobes that share the same tongue-like shape. Sedimentological features, together with body fossils and associated trace fossils (Planolites, Chondrites), indicate a shoreface habitat for the Zoophycos producer. This shallow-marine environmental setting is in contrast with the deeper bathymetries in which lobed Zoophycos are recovered in post-Palaeozoic times. The producer of the lobed Zoophycos of the Yukon River is interpreted as a deposit-feeder that used sensory-driven, directed search for locating heterogeneously distributed trophic resources. The Zoophycos producer filled its burrow with Coprolus-like fecal pellets, possibly complementing deposit feeding with microbial gardening and/or food caching. Data presented here provide useful insight into the morphological evolution and bathymetric distribution of Zoophycos, suggesting two ‘Golden Ages’ for lobed Zoophycos: (1) Carboniferous–Permian and (2) Cretaceous–Neogene. This stratigraphic distribution supports the important ecological role of major terrestrialization events, that are, the Palaeozoic expansion of land plants and the Mesozoic expansion of angiosperms. The consequent increased input of nutrients to coastal areas was an important contributor to declining trends in porewater oxygen concentrations. This phenomenon favored adaptive traits to exploit nutrient-rich but oxygen-poor niches, among which the U-shaped marginal tube of lobed Zoophycos was an efficient adaptation to bring oxygenated water into low-oxygen substrates.
Keywords	Mesozoic era ; Permian period ; burrows ; conservation areas ; limestone ; oxygen ; palaeogeography ; paleoclimatology ; paleoecology ; rivers ; sandstone ; surveys ; Alaska
Language	English
Dates of publication	2022-0501
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	417718-6
ISSN	0031-0182
ISSN	0031-0182
DOI	10.1016/j.palaeo.2022.110931
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: A new basal hadrosaurid (Dinosauria: Ornithischia) from the latest Cretaceous Kita-ama Formation in Japan implies the origin of hadrosaurids.

Kobayashi, Yoshitsugu / Takasaki, Ryuji / Kubota, Katsuhiro / Fiorillo, Anthony R

Scientific reports

2021 Volume 11, Issue 1, Page(s) 8547

Abstract: Here we describe a partial hadrosaurid skeleton from the marine Maastrichtian Kita-ama Formation in Japan as a new taxon, Yamatosaurus izanagii gen. et sp. nov., based on unique characters in the dentition. Our phylogenetic analysis demonstrates ... ...

Abstract	Here we describe a partial hadrosaurid skeleton from the marine Maastrichtian Kita-ama Formation in Japan as a new taxon, Yamatosaurus izanagii gen. et sp. nov., based on unique characters in the dentition. Our phylogenetic analysis demonstrates Yamatosaurus izanagii belongs to Hadrosauridae, composed of Hadrosaurus foulkii + (Yamatosaurus izanagii + (Saurolophinae + Lambeosaurinae)). The coracoid lacks a biceps tubercle as in non-hadrosaurid hadrosauroids, suggesting its presence is a key feature for the clade of Saurolophinae and Lambeosaurinae. The evolutionary rates analysis further supports that shoulder and forelimb features, which are likely to have been involved in locomotion, were important for the early evolution of Hadrosauridae. Our biogeographic analyses show that basal hadrosaurids were widely distributed in Asia and Appalachia, that the clade of Saurolophinae and Lambeosaurinae originated in Asia, and that eastern Asia may have served as a refugium of relict hadrosauroid taxa such as Plesiohadros djadokhtaensis, Tanius sinensis, and Yamatosaurus izanagii during the Late Cretaceous. The contemporaneous occurrence of basal (Yamatosaurus izanagii) and derived (Kamuysaurus japonicus) hadrosaurids during the Maastrichtian in Japan is the first record in Asia. Because of the long geographical distance between these localities, they likely did not co-exist, but instead demonstrate some level of provinciality.
Language	English
Publishing date	2021-04-27
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-021-87719-5
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Article ; Online: New therizinosaurid dinosaur from the marine Osoushinai Formation (Upper Cretaceous, Japan) provides insight for function and evolution of therizinosaur claws.

Kobayashi, Yoshitsugu / Takasaki, Ryuji / Fiorillo, Anthony R / Chinzorig, Tsogtbaatar / Hikida, Yoshinori

Scientific reports

2022 Volume 12, Issue 1, Page(s) 7207

Abstract: The record of therizinosaurs is rich in Asian countries such as Mongolia and China. Fragmentary therizinosaur specimens have been reported from the Lower and Upper Cretaceous deposits in Japan. One of these specimens, from the lower Campanian Osoushinai ... ...

Abstract	The record of therizinosaurs is rich in Asian countries such as Mongolia and China. Fragmentary therizinosaur specimens have been reported from the Lower and Upper Cretaceous deposits in Japan. One of these specimens, from the lower Campanian Osoushinai Formation in Nakagawa Town of Hokkaido Prefecture, was previously identified as a maniraptoran theropod dinosaur, possibly therizinosaur, but its taxonomic status remained unresolved. This study re-examines the specimen and provides a more detailed description and attempts to resolve its taxonomic status. Our study demonstrates that it is a new taxon, Paralitherizinosaurus japonicus gen. et sp. nov., because it shows a unique combination of characters in the metacarpal I and unguals. Our phylogenetic analysis places this new taxon within an unresolved clade of Therizinosauridae in the strict consensus tree. The 50% majority-rule consensus tree shows better resolution within Therizinosauridae, showing an unresolved monophyletic clade of Paralitherizinosaurus, Therizinosaurus, Suzhousaurus, and the Bissekty form. Geometric morphometric analysis suggests that Paralitherizinosaurus unguals most closely resemble Therizinosaurus unguals in being slender and has weak flexor tubercles. This study also shows an evolutionary trend in ungual shape, which associates a decrease in mechanical advantage, development of flexor tubercle, and hypothesized output (product of mechanical advantage and development of flexor tubercle) in derived therizinosaurs, supporting the hook-and-pull function of claws to bring vegetation to its mouth. Paralitherizinosaurus is the youngest therizinosaur from Japan and the first recovered from the marine deposits in Asia. This suggests a long temporal existence of therizinosaurs at the eastern edge of the Asian continent and adaptation of therizinosaurs to coastal environments.
MeSH term(s)	Animals ; Dinosaurs/anatomy & histology ; Fossils ; Hoof and Claw ; Japan ; Phylogeny
Language	English
Publishing date	2022-05-03
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-022-11063-5
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Article ; Online: A giant tyrannosaur from the Campanian-Maastrichtian of southern North America and the evolution of tyrannosaurid gigantism.

Dalman, Sebastian G / Loewen, Mark A / Pyron, R Alexander / Jasinski, Steven E / Malinzak, D Edward / Lucas, Spencer G / Fiorillo, Anthony R / Currie, Philip J / Longrich, Nicholas R

Scientific reports

2024 Volume 13, Issue 1, Page(s) 22124

Abstract: Tyrannosaurid dinosaurs dominated as predators in the Late Cretaceous of Laurasia, culminating in the evolution of the giant Tyrannosaurus rex, both the last and largest tyrannosaurid. Where and when Tyrannosaurini (T. rex and kin) originated remains ... ...

Abstract	Tyrannosaurid dinosaurs dominated as predators in the Late Cretaceous of Laurasia, culminating in the evolution of the giant Tyrannosaurus rex, both the last and largest tyrannosaurid. Where and when Tyrannosaurini (T. rex and kin) originated remains unclear. Competing hypotheses place tyrannosaurin origins in Asia, or western North America (Laramidia). We report a new tyrannosaurin, Tyrannosaurus mcraeensis, from the Campanian-Maastrichtian Hall Lake Formation of New Mexico, based on a fossil previously referred to T. rex. T. mcraeensis predates T. rex by ~ 6-7 million years, yet rivaled it in size. Phylogenetic analysis recovers T. mcraeensis as sister to T. rex and suggests Tyrannosaurini originated in southern Laramidia. Evolution of giant tyrannosaurs in southern North America, alongside giant ceratopsians, hadrosaurs, and titanosaurs suggests large-bodied dinosaurs evolved at low latitudes in North America.
MeSH term(s)	Animals ; Phylogeny ; Gigantism ; Fossils ; North America ; New Mexico ; Dinosaurs/anatomy & histology ; Biological Evolution
Language	English
Publishing date	2024-01-11
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-023-47011-0
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Article ; Online: Re-examination of the cranial osteology of the Arctic Alaskan hadrosaurine with implications for its taxonomic status.

Takasaki, Ryuji / Fiorillo, Anthony R / Tykoski, Ronald S / Kobayashi, Yoshitsugu

PloS one

2020 Volume 15, Issue 5, Page(s) e0232410

Abstract: Hadrosaurid fossils from the Liscomb Bonebed (Prince Creek Formation, North Slope, Alaska) were the first dinosaur bones discovered from the Arctic. While the Prince Creek Formation hadrosaurids were long identified as Edmontosaurus, a member of the sub- ... ...

Abstract	Hadrosaurid fossils from the Liscomb Bonebed (Prince Creek Formation, North Slope, Alaska) were the first dinosaur bones discovered from the Arctic. While the Prince Creek Formation hadrosaurids were long identified as Edmontosaurus, a member of the sub-clade Hadrosaurinae, they were recently assigned to a newly-erected taxon, Ugrunaaluk kuukpikensis. However, taxonomic status of the new taxon is ambiguous largely due to the immature nature of the specimens upon which it was based. Here we reexamine cranial elements of the Prince Creek Formation hadrosaurine in order to solve its taxonomic uncertainties. The Prince Creek Formation hadrosaurine possesses a short dorsolateral process of the laterosphenoid, one of the diagnostic characters of Edmontosaurus. The Prince Creek Formation hadrosaurine also shows affinity to Edmontosaurus regalis in the presence of a horizontal shelf of the jugal. Our morphological comparisons with other North American Edmontosaurus specimens and our phylogenetic analyses demonstrate that the Prince Creek Formation hadrosaurine should be re-assigned to Edmontosaurus. Because the Prince Creek Formation Edmontosaurus shows differences with lower latitude Edmontosaurus in a dorsoventrally short maxilla, presence of a secondary ridge on the dentary teeth, and the absence of the transverse ridge between basipterygoid processes of the basisphenoid, we consider that the Prince Creek Formation Edmontosaurus should be regarded as Edmontosaurus sp. until further discoveries of mature hadrosaurines from the Prince Creek Formation Bonebed and/or equivalently juvenile Edmontosaurus specimens from the lower latitudes allow direct comparisons. The retention of the Prince Creek Formation hadrosaurine as Edmontosaurus re-establishes a significant latitudinal distribution for this taxon. Despite the large latitudinal distribution of the taxon, the morphological disparity of Edmontosaurus is small within Hadrosaurinae. The small morphological disparity may be related to the relatively low latitudinal temperature gradient during the latest Cretaceous compared to present day, a gradient which might not have imposed significant pressure for much morphological adaptations across a broad latitudinal range.
MeSH term(s)	Acclimatization ; Adaptation, Physiological ; Alaska ; Animals ; Arctic Regions ; Biological Evolution ; Dinosaurs/anatomy & histology ; Dinosaurs/classification ; Dinosaurs/physiology ; Ecosystem ; Fossils/anatomy & histology ; Fossils/history ; Geography ; History, Ancient ; Phylogeny ; Skull/anatomy & histology
Language	English
Publishing date	2020-05-06
Publishing country	United States
Document type	Historical Article ; Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
ZDB-ID	2267670-3
ISSN	1932-6203 ; 1932-6203
ISSN (online)	1932-6203
ISSN	1932-6203
DOI	10.1371/journal.pone.0232410
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Article ; Online: Description of the first definitive Corythosaurus (Dinosauria, Hadrosauridae) specimens from the Judith River Formation in Montana, USA and their paleobiogeographical significance.

Takasaki, Ryuji / Chiba, Kentaro / Fiorillo, Anthony R / Brink, Kirstin S / Evans, David C / Fanti, Federico / Saneyoshi, Mototaka / Maltese, Anthony / Ishigaki, Shinobu

Anatomical record (Hoboken, N.J. : 2007)

2022 Volume 306, Issue 7, Page(s) 1918–1938

Abstract: Despite the long history of research in the late Campanian Judith River Formation in northern Montana, most of the vertebrate fossils are represented by fragmentary remains, making precise taxonomic identifications difficult. Contrary to this, the ... ...

Abstract	Despite the long history of research in the late Campanian Judith River Formation in northern Montana, most of the vertebrate fossils are represented by fragmentary remains, making precise taxonomic identifications difficult. Contrary to this, the partially contemporaneous Dinosaur Park Formation, Alberta, Canada is known for its tremendous fossil preservation, permitting rigorous studies of dinosaur diversity, evolution, and biostratigraphy. Hadrosaurids comprise one of the most abundant dinosaur clades in the Dinosaur Park Formation, but taxonomic affinities of hadrosaurid specimens remain poorly understood in the Judith River Formation. Corythosaurus is the most common hadrosaurid in the Dinosaur Park Formation and, to date, has been restricted to this formation. This study reports the first definitive Corythosaurus specimens from the Judith River Formation, which were discovered on two private ranches in northern Montana. The attribution of the most complete skeleton to Corythosaurus is indicated by: wide crest-snout angle, presence of premaxilla-nasal fontanelle, dorsoventrally expanded nasal, laterally exposed ophthalmic canal of the laterosphenoid, and tall neural spines. A second specimen preserves a large ilium that can be positively identified as Corythosaurus based on its associated skull, which is now in private hands. The specimens were recovered from the Coal Ridge Member of the Judith River Formation, which is approximately time equivalent to the Dinosaur Park Formation. Thus, the discovery of Corythosaurus in the Judith River Formation extends the biogeographic range of this genus and establishes a framework for future interformational biostratigraphic studies of Late Cretaceous dinosaur faunas in North America.
MeSH term(s)	Animals ; Dinosaurs/anatomy & histology ; Montana ; Rivers ; Fossils ; Skull/anatomy & histology ; Phylogeny
Language	English
Publishing date	2022-10-23
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2269667-2
ISSN	1932-8494 ; 1932-8486
ISSN (online)	1932-8494
ISSN	1932-8486
DOI	10.1002/ar.25097
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