Pelvic and hindlimb muscular reconstruction of the paravian theropod Buitreraptor gonzalezorum and its palaeobiological implications

Historical Biology, Год журнала: 2024, Номер unknown, С. 1 - 27

Опубликована: Янв. 14, 2024

Soft tissue reconstructions of fossil vertebrates provide valuable data and support for functional interpretations. Here, we present the pelvic hindlimb muscular reconstruction Buitreraptor gonzalezorum, a unenlagiine dromaeosaurid theropod. Dromaeosaurids employed their hindlimbs locomotion predation, with specialised pedal digit II. Using 'extant phylogenetic bracket' methodology, reconstruct 29 muscles out 37 typically found in extant archosaur hindlimbs. Some characteristics resemble those cursorial tetrapods. For example, M. iliotibialis shows an increased hip abduction moment arm, while primary protractors exhibit flexion main retractors display decreased extension arm. However, positive allometric growth limb inertia relative to body mass gradual transition 'knee-based' observed birds may have influenced muscle arms. Regarding predatory functions, features length proportions metatarsus II phalanges suggest faster movements compared derived dromaeosaurids. Also, robust flexor muscle, likely perforans et perforatus digiti II, was inserted on proximoventral heel second phalanx These interpretations presence behaviours different from more

Язык: Английский

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Shed teeth from Portezuelo Formation at Sierra del Portezuelo reveal a higher diversity of predator theropods during Turonian-Coniacian times in northern Patagonia

Research Square (Research Square), Год журнала: 2024, Номер unknown

Опубликована: Март 1, 2024

The study of thirty-two shed crowns from the Portezuelo Formation (middle Turonian-late Coniacian) at Sierra del locality, reveals six distinct tooth morphotypes identified through cladistic, discriminant, and cluster analyses. Two were as belonging to Megaraptoridae, three Abelisauridae, one Abelisauroidea, Alvarezsauridae. Additionally, two exhibit a combination dental features typically found in megaraptorid abelisauridtheropods. These results suggest greater diversity theropods original ecosystem than previously thought, including presence second morphotype alvarezsaurid undocumented this formation. Furthermore, existence Morphotype 6 indicates potential coexistence medium-sized abelisauroids alongside larger abelisaurids same ecosystem. findings underscore importance future expeditions locality further our understanding these unknown theropod species.

Язык: Английский

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Appendicular myology of Skorpiovenator bustingorryi: A first attempt to reconstruct pelvic and hindlimb musculature in an abelisaurid theropod

The Anatomical Record, Год журнала: 2024, Номер unknown

Опубликована: Июль 11, 2024

Abstract We present the pelvic and hindlimb musculature of abelisaurid Skorpiovenator bustingorryi , constituting most comprehensive muscle reconstruction to date in ceratosaur theropods. Using extant phylogenetic bracket method, we reconstructed 39 muscles that can commonly found archosaurs. Through identification bone correlates, recognized thigh including knee extensors, m. iliofibularis flexor tibialis externus mm. caudofemorales puboischiofemorales crus important foot extension flexion (e.g., anterior gastrocnemii ). Also, autopodial intrinsic were whose function involve ( extensor digiti 2–4 ), digitorum brevis superficialis interdigital adduction interosseus dorsalis ) abduction interosseous plantaris abductor 4 Abelisaurids like show a deep pre‐ postacetabular blade ilia enlarged cnemial crests, which would have helped increasing moment arm related hip extension. pedal pronation probably but reduced pronator profundus Despite some gross differences morphology outgroups crocodilian metatarsus avian tarsometatarsus), study allows us hypothesize several . These not be arranged tendinous bundles as Neornithes, rather condition similar crocodilians with layers formed by fleshy bellies on plantar dorsal aspects metatarsus. The is key for future studies concerning biomechanics, integration functional ichnological data.

Язык: Английский

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Caletodraco cottardi: A New Furileusaurian Abelisaurid (Dinosauria: Theropoda) from the Cenomanian Chalk of Normandy (North-Western France)

Fossil Studies, Год журнала: 2024, Номер 2(3), С. 177 - 195

Опубликована: Авг. 19, 2024

An articulated group of skeletal elements comprising a sacrum, both ilia and first caudal vertebra, plus an isolated tooth found in immediate proximity to the bones, from lower Cenomanian Chalk at Saint-Jouin-Bruneval (Seine-Maritime, Normandy, France) is described attributed new genus species abelisaurid theropod, Caletodraco cottardi, on basis several characters sacrum pelvis. The peculiar shape transverse process vertebra shows that cottardi differs majungasaurine abelisaurids previously Europe, such as Arcovenator escotae, belongs Furileusauria, derived hitherto recognized only South America. presence furileusaurian Normandy suggests biogeographical history Abelisauridae Europe was more complex than admitted. Several European abelisaurids, Albian Genusaurus sisteronis, may fact belong Furileusauria.

Язык: Английский

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A rebbachisaurid-mimicking titanosaur and evidence of a Late Cretaceous faunal disturbance event in South-West Gondwana

Cretaceous Research, Год журнала: 2023, Номер 154, С. 105754 - 105754

Опубликована: Окт. 30, 2023

Язык: Английский

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The evolution and diversification of growth strategies in abelisauroid theropodsCitation for this article: Aureliano, T., Ghilardi, A. M., Fonseca, P. H. M., Martinelli, A. G., & Marinho, T. S. (2024) The evolution and diversification of growth strategies in abelisauroid theropods. Journal of Vertebrate Paleontology . https://doi.org/10.1080/02724634.2023.2298395

Journal of Vertebrate Paleontology, Год журнала: 2023, Номер 43(3)

Опубликована: Май 4, 2023

Theropods comprise a successful group of mostly predatory dinosaurs with varied growth rates that colonized all continents. Much research has addressed the histology Global North's Mesozoic populations, especially coelurosaurians and allosauroids. However, little been done to understand histological patterns Gondwanan abelisauroids. Previous studies detected disparate (parallel-fibered or fibrolamellar) bone profiles between noasaurids abelisaurids but did not include broader quantitative analyses. Here we describe femoral mid-sized abelisaurid from Upper Cretaceous Serra da Galga Formation, Bauru Group, Southeast Brazil. Despite harsh semiarid paleotropical context, our specimen shows rate more similar Patagonian abelisaurids, challenging previous hypothesis on environmental pressure selecting taxa lower parallel-fibered tissue. We also bring data bear several test tissue differentiation within abelisauroid clades. Our logistic regression correlation analyses show variation in can be explained by body size phylogeny when considering fibrolamellar tissue, A decrease through deposition may an example evolutionary convergence some small-bodied sauropods.

Язык: Английский

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Unraveling sauropod diversity in the Portezuelo Formation of Patagonia through a comprehensive analysis of new and existing material

BMC Ecology and Evolution, Год журнала: 2024, Номер 24(1)

Опубликована: Июль 9, 2024

Abstract The Portezuelo Formation preserves an outstanding record of the upper Turonian – lower Coniacian. Despite discovery a significant quantity sauropod fossil material from formation, only two species have been formally described to date: Malarguesaurus florenciae and Futalognkosaurus dukei . Here we present new mostly composed non-articulated caudal vertebrae (MCF-PVPH 916 917) that belong titanosauriforms on basis following features: anterior with procoelous-opisthoplatyan articulations, transverse processes reach posterior articular face centrum neural spines width around 50% their anteroposterior length; middle arch restricted half centrum; centra circular cross-section. Phylogenetic analysis recovers in close relation within monophyletic clade at base Somphospondyli. This shares large pedicel height vertical border vertebrae, orientation distalmost proximalmost subequal relative lengths proximal ulnar condylar processes. specimens presented here are distinct not , but also other indeterminate titanosaurian remains same formation. However, there no differences between specimen MCF-PVPH 917 so they could be considered different species. Whilst err side caution naming taxa here, significantly expand what know about sauropods Turonian–Coniacian ecosystems Patagonia, which will continue do as more is discovered.

Язык: Английский

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A new chelid turtle with an ornamented bony shell (Pleurodira: Chelidae) from the Portezuelo Formation (Upper Cretaceous) of Patagonia, Argentina

Historical Biology, Год журнала: 2024, Номер unknown, С. 1 - 14

Опубликована: Дек. 9, 2024

We describe Baalemys mansillai gen. et sp. nov. a chelid turtle, based on an articulated shell from the Portezuelo Formation of Baal locality, northern shore Barreales lake, Neuquén Province, Argentina. is distinguished other chelids by its oval shape, moderate size, distinctive granulated ornamentation, narrow nuchal plate, first hexagonal neural with short posterolateral margins, second plate that regular hexagon, and posterior lobe longer than both anterior bridge. This unique combination features supports establishment new genus species. nov was discovered in locality sauropod dinosaurs, theropod crocodiles, pelomedusoid turtles genera chelids; similar biota identified localities Formation. The identification significantly adds to our knowledge diversity pleurodiran Formation, Basin, broader Patagonian region.

Язык: Английский

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UNA VÉRTEBRA CAUDAL NO FURILEUSAURIANA DE LA FORMACIÓN BAJO DE LA CARPA (SANTONIAN) Y VARIACIÓN MORFOLÓGICA EN LA COLA DE LOS ABELISAURIDAE

Publicación Electrónica de la Asociación Paleontológica Argentina, Год журнала: 2022, Номер unknown

Опубликована: Янв. 1, 2022

The Cerro Overo-La Invernada area in north Patagonia has provided a rich record of Cretaceous continental tetrapods the last two decades, mainly from Bajo de la Carpa Formation (Upper Cretaceous, Santonian). dinosaur fauna this is diverse, including several new taxa, with abelisaurid theropods particularly abundant. Recently, isolated caudal vertebra (MAU-Pv-CO-598) was here recovered. Although fragmentary, it shows features that differentiate other remains previously found area. It considered mid-caudal and characterized by longitudinal groove on ventral surface centrum; scarcely elevated transverse process an anteroposteriorly expanded laterally concave distal end; dorsal crest anteriorly extended anterior border neural spine; small tubercles ends zygapophyses, which are as accessory interlocking structures between vertebrae. Some characters, such present also non-brachyrostran Majungasaurus. However, similar to vertebrae non-furileusaur brachyrostrans, Ilokelesia, Ekrixinatosaurus, Skorpiovenator. A phylogenetic analysis conducted clusters MAU-Pv-Co-598 latter three taxa. MAU-Pv-CO-598 comes lower levels than furileusaurs Viavenator Llukalkan. presence specimen non-furileusaurian affinities formation indicates possible replacement furileusaur brachyrostrans occurred during Santonian, after proposed Turonian faunal turnover.

Язык: Английский

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