Isolated theropod teeth from the Upper Jurassic to Lower Cretaceous Khorat Group: Implications for theropod diversity in Thailand

Cretaceous Research, Год журнала: 2025, Номер unknown, С. 106147 - 106147

Опубликована: Апрель 1, 2025

Язык: Английский

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Theropod dinosaur diversity of the lower English Wealden: analysis of a tooth‐based fauna from the Wadhurst Clay Formation (Lower Cretaceous: Valanginian) via phylogenetic, discriminant and machine learning methods

Papers in Palaeontology, Год журнала: 2024, Номер 10(6)

Опубликована: Ноя. 1, 2024

Abstract The Lower Cretaceous Wealden Supergroup of southern England yields a diverse assemblage theropod dinosaurs, its taxa being represented by fragments in addition to some the most informative associated skeletons European Mesozoic. Spinosaurids, neovenatorid allosauroids, tyrannosauroids and dromaeosaurids are among reported clades. However, majority relevant specimens from Barremian Upper Weald Clay Wessex formations, diversity older Berriasian–Valanginian Hastings Group has remained poorly known, fragmentary thus far remaining enigmatic both terms phylogenetic affinities sometimes provenance. A better understanding would be welcome given paucity dinosaurs worldwide. Here, we describe an teeth Valanginian Wadhurst Formation, mostly collected Ashdown Brickworks locality near Bexhill, East Sussex. These were assessed using phylogenetic, discriminant machine learning analyses found include members Spinosauridae, Tyrannosauroidea Dromaeosauridae, others that remain uncertain affinity within Coelurosauria. appear distinct those already known strata: spinosaurid cannot referred Baryonyx or tyrannosauroid Eotyrannus , for example, but have not named new at this time. Combined with other findings our study indicates was comparable younger units, implying ‘characteristic’ components faunas established early deposition famous geological succession.

Язык: Английский

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Fossil assemblage from the Khok Pha Suam locality of northeastern, Thailand: an overview of vertebrate diversity from the Early Cretaceous Khok Kruat Formation (Aptian-Albian)

Fossil record, Год журнала: 2022, Номер 25(1), С. 83 - 98

Опубликована: Март 23, 2022

The Khok Pha Suam locality in the province of Ubon Ratchathani, northeastern, Thailand, is known as “the last home Thai dinosaurs”, because it belongs to Lower Cretaceous Kruat Formation (Aptian-Albian) which currently youngest Mesozoic vertebrate fossil producing formation Khorat Group. Here, we describe a diverse assemblage, including hybodonts, ray-finned fishes, turtles, crocodyliforms, pterosaurs, and dinosaurs from locality. updated data on fauna provides better understanding variety distribution Early continental ecosystems, are useful for palaeoenvironmental reconstruction. In addition consolidating unincorporated fauna, this study also palaeontological necessary illustrate palaeoecosystem general public, well improving academic value Chan-Sam Phan Bok Geopark.

Язык: Английский

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New contributions to the skull anatomy of spinosaurid theropods: Baryonychinae maxilla from the Early Cretaceous of Igea (La Rioja, Spain)

Historical Biology, Год журнала: 2022, Номер 35(6), С. 909 - 923

Опубликована: Май 17, 2022

Spinosaurid dinosaurs show a wide geographical and temporal distribution, being present in Gondwanan Laurasian landmasses, at least, during the Lower Cretaceous Cenomanian. European spinosaurids are more diverse than previously thought with five, probably six, currently recognised genera. The revision of CPI 477, fragment left maxilla from La Rioja (Spain) assigned to Baryonyx, demonstrates that this specimen cannot be referred genus likely belongs an indeterminate baryonychine closer Baryonyx Suchomimus. 477 exhibits tooth replacement process comparable other theropods and, besides, similar large theropods, two teeth could simultaneously developed same alveolus, partly explaining high ratios overabundance spinosaurid some fossil sites. Furthermore, Oxalaia shares anteriorly located external naris Irritator spinosaurids, which differ retracted ones African spinosaurines. Finally, addition noticed differences between Baryonychinae Spinosaurinae, paradental groove spinosaurines differs baryonychines sinusoidal instead straight.

Язык: Английский

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On the first Baryonychinae (Theropoda, Spinosauridae) teeth from South America

Zootaxa, Год журнала: 2023, Номер 5264(4), С. 526 - 544

Опубликована: Апрель 17, 2023

We report the first occurrence in South America of spinosaurid specimens belonging to clade Baryonychinae. The material comprises three tooth crowns recovered from Lower Cretaceous (Berriasian-Valanginian) Feliz Deserto Formation, State Sergipe, northeast Brazil. have typical conidont condition, displaying a fluted morphology, veined enamel texture and carinae extending cervix region, conditions similar those shared among theropods. Furthermore, notable feature is presence serrated composed 6-7 diminutive denticles per millimetre, key by baryonychine spinosaurids. Phylogenetic multivariate analyses performed on dentition-based crown-based datasets theropod taxa confirm relationship described here with well-supported clade. Our results retrieve which comprise "classically" as individual branches within polytomy includes subclade spinosaurines (Spinosaurus + Angaturama/Irritator). Additionally, discriminant cluster suggest that materials are more Suchomimus than Baryonyx morphometrically, but clearly bearing similarities baryonychines (sharing morphospace). These new findings paleogeographically expand this western Gondwana, one oldest records worldwide, brings implications hypotheses for emergence evolution these indicate taxon deltaic paleoenvironment Formation.

Язык: Английский

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A European giant: a large spinosaurid (Dinosauria: Theropoda) from the Vectis Formation (Wealden Group, Early Cretaceous), UK

PeerJ, Год журнала: 2022, Номер 10, С. e13543 - e13543

Опубликована: Июнь 9, 2022

Postcranial elements (cervical, sacral and caudal vertebrae, as well ilium, rib limb bone fragments) belonging to a gigantic tetanuran theropod were recovered from the basal unit (the White Rock Sandstone equivalent) of Vectis Formation near Compton Chine, on southwest coast Isle Wight. These remains appear pertain same individual, with enormous dimensions similar those Spinosaurus holotype exceeding largest European theropods previously reported. A combination features—including presence spinodiapophyseal webbing an anterior vertebra—suggest that this is member Spinosauridae, though lack convincing autapomorphies precludes identification new taxon. Phylogenetic analysis supports spinosaurid affinities but we unable determine more precise position within clade weak support for Spinosaurinae or early-diverging Spinosauridae found in some data runs. Bioerosion form curved tubes evident several pieces, potentially related harvesting behaviour by coleopteran bioeroders. This first reported youngest British material referred clade. unusual majority dinosaurs Lower Cretaceous units Wealden Supergroup are fluviolacustrine deposits underlying Barremian Wessex Formation. In contrast, lagoonal facies upper Barremian–lower Aptian only rarely yield dinosaur material. Our conclusions keeping previous studies emphasise western Europe pivotal region origination diversification.

Язык: Английский

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A new spinosaurid dinosaur species from the Early Cretaceous of Cinctorres (Spain)

Scientific Reports, Год журнала: 2023, Номер 13(1)

Опубликована: Май 18, 2023

Abstract A new spinosaurid genus and species is described based on the right maxilla five caudal vertebrae of a single specimen from Arcillas de Morella Formation (Early Cretaceous) at locality Cinctorres (Castellón, Spain). Protathlitis cinctorrensis gen. et sp. nov. diagnosed by one autapomorphic feature as well unique combination characters. The autapomorphy includes subcircular depression in anterior corner antorbital fossa maxilla. Iberian recovered basal baryonychine. recognition first baryonychine dinosaur identified (late Barremian) same time Vallibonavenatrix cani , spinosaurine formation subbasin (Maestrat Basin, eastern Spain), indicates that Peninsula was home to highly diverse assemblage medium-to-large bodied dinosaurs. It seems spinosaurids appeared during Early Cretaceous Laurasia, with two subfamilies occupying western part Europe this period. Later, Barremian–Aptian, they migrated Africa Asia, where would diversify. In Europe, baryonychines were dominant, while Africa, spinosaurines most abundant.

Язык: Английский

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Isolated tooth reveals hidden spinosaurid dinosaur diversity in the British Wealden Supergroup (Lower Cretaceous)

PeerJ, Год журнала: 2023, Номер 11, С. e15453 - e15453

Опубликована: Май 31, 2023

Isolated spinosaurid teeth are relatively well represented in the Lower Cretaceous Wealden Supergroup of southern England, UK. Until recently it was assumed that these were referable to

Язык: Английский

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The vertebrate fossil record from the Feliz Deserto Formation (Lower Cretaceous), Sergipe, NE Brazil: paleoecological, taphonomic, and paleobiogeographic implications

Cretaceous Research, Год журнала: 2023, Номер 147, С. 105463 - 105463

Опубликована: Янв. 3, 2023

Язык: Английский

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A well preserved pan-pleurodiran (Dortokidae) turtle from the English Lower Cretaceous and the first radiometric date for the Wessex Formation (Hauterivian–Barremian) of the Isle of Wight, United Kingdom

Cretaceous Research, Год журнала: 2023, Номер 150, С. 105590 - 105590

Опубликована: Май 27, 2023

The oldest record of a dortokid turtle (Testudines, Pan-Pleurodira) and the first occurrence group in UK is reported. This find corresponds to pan-pleurodiran country, only one from Mesozoic UK. new specimen, Lower Cretaceous (Barremian) Wessex Formation Isle Wight, comprises relatively complete shell with post cranial elements within calcite-filled vacuity. Micro CT scanning has revealed these tiny bones include cervical, dorsal caudal vertebrae, scapulae, pelvic girdle appendicular elements. In addition, aspects internal morphology carapace plastron are revealed. No features allow specimen be distinguished coeval Eodortoka morellana Spain, we therefore identify it as cf. morellana. was found ex-situ, due questions raised regarding provenance U–Pb geochronology diagenetic calcite filling performed establish age specimen. Previously, been challenging determine absolute timing constraints for fossil material lack minerals dateable radiometric techniques. analysis thus provided date 127.3 ± 2.7 Ma.

Язык: Английский

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