A new abelisaurid dinosaur from the end Cretaceous of Patagonia and evolutionary rates among the Ceratosauria

Cladistics, Год журнала: 2024, Номер 40(3), С. 307 - 356

Опубликована: Май 21, 2024

Abstract Gondwanan dinosaur faunae during the 20 Myr preceding Cretaceous–Palaeogene (K/Pg) extinction included several lineages that were absent or poorly represented in Laurasian landmasses. Among these, South American fossil record contains diverse abelisaurids, arguably most successful groups of carnivorous dinosaurs from Gondwana Cretaceous, reaching their highest diversity towards end this period. Here we describe Koleken inakayali gen. et sp. n., a new abelisaurid La Colonia Formation (Maastrichtian, Upper Cretaceous) Patagonia. is known skull bones, an almost complete dorsal series, sacrum, caudal vertebrae, pelvic girdle and hind limbs. The shows unique set features anatomical differences Carnotaurus sastrei (the only other Formation). retrieved as brachyrostran abelisaurid, clustered with abelisaurids latest Cretaceous (Campanian–Maastrichtian), such Aucasaurus , Niebla . Leveraging our phylogeny estimates, explore rates morphological evolution across ceratosaurian lineages, finding them to be particularly high for elaphrosaurine noasaurids around base Abelisauridae, before Early radiation latter clade. Noasauridae sister clade show contrasting patterns evolution, undergoing early phase accelerated axial limb skeleton Jurassic, exhibiting sustained cranial Cretaceous. These results provide much needed context evolutionary dynamics theropods, contributing broader understanding macroevolutionary dinosaurs.

Язык: Английский

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A new unenlagiine (Theropoda, Dromaeosauridae) from the Upper Cretaceous of Brazil

Papers in Palaeontology, Год журнала: 2021, Номер 7(4), С. 2075 - 2099

Опубликована: Авг. 5, 2021

Abstract The record of unenlagiines in Brazil, except for one dorsal vertebra, is still under debate based on isolated teeth. Here, we describe Ypupiara lopai gen. et sp. nov., the first dromaeosaurid species from Maastrichtian Bauru Group, Paraná Basin. specimen consists a partial right maxilla (with three teeth loci ) and dentary. characterized by restricted number neurovascular foramina lateral surface maxilla, rectangular anteroposteriorly expanded interdental plate, labiolingual compression teeth, which have diameter more than 3/5 rostrocaudal diameter. Our phylogenetic analysis recovers as an unenlagiine fluted places it sister taxon Austroraptor due to ratio mesiodistal diameters being 3/5. We also erect new group Unenlagiinia, includes Unenlagiinae Halszkaraptorinae. nests within Unenlagiinia widely spaced lack mesial distal carinae maxillary morphology similar Buitreraptor , although proportions are markedly distinct. comparisons with other support fish part diet . performed parsimony endemicity, suggested that presence Brazilian Upper Cretaceous outcrops explained dispersion or extinction events. provides information evolution Gondwanan dromaeosaurids, its preserved provide data enable assignment Group.

Язык: Английский

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Elemgasem nubilus: a new brachyrostran abelisaurid (Theropoda, Ceratosauria) from the Portezuelo Formation (Upper Cretaceous) of Patagonia, Argentina

Papers in Palaeontology, Год журнала: 2022, Номер 8(5)

Опубликована: Сен. 1, 2022

Abstract Abelisaurids are medium–large‐sized theropod dinosaurs that were predominant in the carnivorous fauna during Late Cretaceous of Gondwana. These predators abundant fossil strata Patagonia, which yield best record for this group. In Cretaceous, abelisaurids appear almost all regions Gondwana and stages, except Coniacian, they globally unknown. Here we describe a new abelisaurid, Elemgasem nubilus gen. et sp. nov., from Portezuelo Formation (Turonian–Coniacian), Argentina. The palaeohistology appendicular bones shows holotype was subadult individual, but had achieved sexual maturity. This taxon is based on several axial elements, diagnosed by presence marked pattern rugosity lateral surface fibula dorsoventrally deep wall calcaneum. Moreover, posterior caudal vertebrae have morphology slightly different any other abelisaurid. recovered as an unstable within Brachyrostra, given it sister Furileusauria or positions clade. Despite problematic phylogenetic relationships , important because first abelisaurid Turonian–Coniacian interval increases diversity family at time turnover tetrapod South America, global climate change, mass extinction events recorded worldwide marine realm.

Язык: Английский

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New theropod dinosaur from the Late Cretaceous of Brazil improves abelisaurid diversity

Journal of South American Earth Sciences, Год журнала: 2021, Номер 112, С. 103551 - 103551

Опубликована: Сен. 4, 2021

Язык: Английский

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The smallest known specimen of Microraptor (Dinosauria: Dromaeosauridae) from the Jiufotang Formation in northeastern China

Historical Biology, Год журнала: 2024, Номер unknown, С. 1 - 11

Опубликована: Авг. 13, 2024

Язык: Английский

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Evolutionary and paleobiogeographic implications of new carcharodontosaurian, megaraptorid, and unenlagiine theropod remains from the upper Lower Cretaceous of Victoria, southeast Australia

Journal of Vertebrate Paleontology, Год журнала: 2025, Номер unknown

Опубликована: Фев. 19, 2025

Язык: Английский

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New Dinosaur Teeth from the Upper Cretaceous Nenjiang Formation in Songliao Basin, Northeast China

Acta Geologica Sinica - English Edition, Год журнала: 2025, Номер 99(2), С. 320 - 331

Опубликована: Апрель 1, 2025

Abstract Twelve new dinosaur teeth have recently been recovered from three localities in the Upper Cretaceous Nenjiang Formation of Songliao Basin. Although fragmentary, material offers enough evidence to identify following taxa: tyrannosaurids, dromaeosaurines, velociraptorines, hadrosauroids, and titanosaurs. In addition previously known dinosaurs basin, several ones identified, extending paleogeographic range related taxa. The discovery these fossil remains provides valuable insights into diversity sheds light on terrestrial ecosystem during Late

Язык: Английский

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Overabundance of abelisaurid teeth in the Açu Formation (Albian-Cenomanian), Potiguar Basin, Northeastern Brazil: morphometric, cladistic and machine learning approaches

Journal of Vertebrate Paleontology, Год журнала: 2025, Номер unknown

Опубликована: Июнь 2, 2025

Язык: Английский

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The predominance of teeth in the non-avian dinosaur record from Cretaceous Brazil: a review

Historical Biology, Год журнала: 2023, Номер 36(10), С. 2019 - 2034

Опубликована: Авг. 8, 2023

ABSTRACTDinosaur fossils are commonly found in Brazilian Mesozoic strata, with teeth being frequently Cretaceous outcrops. Many studies have been made the aim of reviewing known diversity dinosaurs, mostly focusing solely on their palaeobiogeography. However, few tried to typify these body order see which kinds were most prevalent fossil record. This study aims count and identify all occurrences non-avian dinosaur (isolated or situ) unearthed from strata objectively measure representativity national Our literature search showed that almost half record Brazil is composed by teeth, those particularly abundant Alcântara, Adamantina Marília formations. Theropod more comparison sauropod spinosaurids, deinonychosaurs, abelisaurids amply found. Despite representing a large share record, only recently studied depth, many specimens reassessed through current identification methods. Other aspects besides primary taxonomic can also be further explored using latest technologies allowing deeper understanding palaeobiology reptiles.KEYWORDS: TeethBrazilCretaceousDinosauriareview AcknowledgmentsThe authors would like thank researchers students who collaborated obtaining articles abstracts used for this study. We two anonymous reviewers, Prof. Carlos Roberto dos Anjos Candeiro Maria Alice Santos Alves comments suggested improvement manuscript. work was supported [Fundação de Amparo à Pesquisa do Estado Rio Janeiro] under Grants [E 04 E-26/204.053/2022 TBR; PDR10 E-26/201.995/2020 PVLGCP. PMB partially Conselho Nacional Desenvolvimento Cientifico e Tecnologico [#305118/2021-8] Fundação Janeiro [#E-26/201.172/2022].Disclosure statementNo potential conflict interest reported author(s).Supplemental dataSupplemental data article accessed online at https://doi.org/10.1080/08912963.2023.2238965.Additional informationFundingThe Chagas Filho [#E-26/201.172/2022 #PDR10 E-26/201.995/2020]; [#305118/2021-8].

Язык: Английский

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A theropod tooth from the Missão Velha Formation (Late Jurassic-Early Cretaceous) of the Araripe Basin: oldest Brazilian Abelisaurid record

Historical Biology, Год журнала: 2024, Номер unknown, С. 1 - 11

Опубликована: Апрель 15, 2024

The Missão Velha Formation (Late Jurassic-Early Cretaceous), often referred to as Brejo Santo Formation, is one of the stratigraphic units Araripe Basin, included within Vale do Cariri Group. This locality, characterised by its fluvio-estuarine paleoenvironment, yielded a diverse paleoichthyofauna while terrestrial vertebrate record still poorly known, with single isolated theropod lateral tooth being briefly cited until now. study aims revisit this specimen (UERJ-PMB R008) in order identify it through current quantitative and qualitative methods. analyses were unable properly classify group, indicating paravian, piatnitzkysaurid abelisaurid affinities, most cladistic assigned UERJ-PMB R008 an tooth. was finally due almost straight distal margin, hooked denticles, similarly sized mesial lanceolate cross section irregular enamel texture. assignment represents not only first definitive for also oldest South America, filling part 30-million-year gap between Eoabelisaurus Spectrovenator.

Язык: Английский

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