Relevant bibliographies by topics / Allosauroidea

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  2. Dissertations / Theses

Academic literature on the topic 'Allosauroidea'

Author: Grafiati
Published: 5 June 2025
Last updated: 8 July 2025

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Journal articles on the topic "Allosauroidea"

1

Bates, Karl T., Roger B. J. Benson, and Peter L. Falkingham. "A computational analysis of locomotor anatomy and body mass evolution in Allosauroidea (Dinosauria: Theropoda)." Paleobiology 38, no. 3 (2012): 486–507. http://dx.doi.org/10.1666/10004.1.

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We investigate whether musculoskeletal anatomy and three-dimensional (3-D) body proportions were modified during the evolution of large (>6000 kg) body size in Allosauroidea (Dinosauria: Theropoda). Three adaptations for maintaining locomotor performance at large body size, related to muscle leverage, mass, and body proportions, are tested and all are unsupported in this analysis. Predictions from 3-D musculoskeletal models of medium-sized (Allosaurus) and large-bodied (Acrocanthosaurus) allosauroids suggest that muscle leverage scaled close to isometry, well below the positive allometry required to compensate for declining muscle cross-sectional area with increasing body size. Regression analyses on a larger allosauroid data set finds slight positive allometry in the moment arms of major hip extensors, but isometry is included within confidence limits. Contrary to other recent studies of large-bodied theropod clades, we found no compelling evidence for significant positive allometry in muscle mass between exemplar medium- and large-bodied allosauroids. Indeed, despite the uncertainty in quantitative soft tissue reconstruction, we find strong evidence for negative allometry in the caudofemoralis longus muscle, the single largest hip extensor in non-avian theropods. Finally, we found significant inter-study variability in center-of-mass predictions for allosauroids, but overall observe that consistently proportioned soft tissue reconstructions produced similar predictions across the group, providing no support for a caudal shift in the center of mass in larger taxa that might otherwise reduce demands on hip extensor muscles during stance. Our data set provides further quantitative support to studies that argue for a significant decline in locomotor performance with increasing body size in non-avian theropods. However, although key pelvic limb synapomorphies of derived allosauroids (e.g., dorsomedially inclined femoral head) evolved at intermediate body sizes, they may nonetheless have improved mass support.
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2

BENSON, ROGER B. J., and XU XING. "The anatomy and systematic position of the theropod dinosaurChilantaisaurus tashuikouensisHu, 1964 from the Early Cretaceous of Alanshan, People's Republic of China." Geological Magazine 145, no. 6 (2008): 778–89. http://dx.doi.org/10.1017/s0016756808005475.

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AbstractThere is little consensus on the systematic position of the colossal theropod dinosaurChilantaisaurus tashuikouensisfrom the Cretaceous (Aptian–?Albian or Upper Cretaceous) Ulansuhai Formation of Inner Mongolia, which has been recovered as a derived member of both Allosauroidea and Spinosauroidea by numerical phylogenetic analyses. Redescription of the type material ofC. tashuikouensisreveals an unusual combination of morphological features that render determination of its systematic position problematic. It possesses anatomical features that have been proposed as synapomorphies of Neotetanurae: a preacetabular fossa on the ilium, and a wedge-shaped cross-section of the shaft of the third metatarsal. It also shares some features with specific allosauroid taxa: a pronounced ulnar epicondyle on the humerus, and a prominent medial shelf bounding the preacetabular fossa on the ilium (also present in tyrannosauroids). However, it lacks some features that are present in all other allosauroids: a marked depression on the anterior surface of the distal humerus adjacent to the ulnar condyle, and a humerus that is less than 0.4 times the length of the femur; it furthermore possesses a tibial astragalar facet that is approximately 10% of the tibial length, which suggests a more basal position within Tetanurae.Chilantaisaurusshares certain features with some spinosauroids: an enlarged and elongated first manual ungual, and a suprastragalar buttress that has been modified to a vertical ridge, but these characters are not unique to spinosauroids. A highly reduced fourth trochanter may be an autapomorphy ofChilantaisaurus, as has previously been suggested, or unite the taxon with Coelurosauria in an entirely novel grouping. On the basis of these observations it is likely thatChilantaisaurusis a neotetanuran, but unlikely that it is an allosauroid.Chilantaisaurusmay belong to an alternative lineage of very large theropods that continued into the Cretaceous from the diversification of basal neotetanurans during the Middle Jurassic.
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3

Brusatte, Stephen L., and Paul C. Sereno. "Phylogeny of Allosauroidea (Dinosauria: Theropoda): Comparative analysis and resolution." Journal of Systematic Palaeontology 6, no. 2 (2008): 155–82. http://dx.doi.org/10.1017/s1477201907002404.

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4

Burigo, André, and Octávio Mateus. "Allosaurus europaeus (Theropoda: Allosauroidea) Revisited and Taxonomy of the Genus." Diversity 17, no. 1 (2024): 29. https://doi.org/10.3390/d17010029.

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Allosaurus is one of the most famous theropod dinosaurs, but the validity and relationships between the different species have been confusing and often questioned. Portugal is relevant to the understanding of the genus in light of the discovery of A. europaeus ML415 from the Early Tithonian of Lourinhã and Allosaurus MNHNUL/AND.001 from Andrés. However, the exact classification and validity of these two specimens has always been controversial. The presence of Allosaurus in Portugal is strong evidence for a North America–Europe Late Jurassic dispersal, later supported by other taxa. A detailed cranial description and specimen-based phylogeny were performed and resolved many of the open questions: (1) The diversity of Allosaurus is limited to three named species: A. fragilis, A. europaeus, and A. jimmadseni. (2) Nine autapomorphies were found in A. europaeus, confirming the validity of the species. (3) Phylogenetic analyses place both Portuguese specimens in the genus Allosaurus, based on the following synapomorphies: jugal bone lateral view, relative heights of quadratojugal prongs, the dorsal prong is equal in height, the jugal bone in lateral view shows shallow accessory pneumatization of the antorbital fossa, the palatine pneumatic recess shape is small, and lacrimal horn morphology has a triangular horn. (4) The Andrés specimen is placed with the A. europaeus and they are considered here to be the same species, which is paleo-geographically and biochronologically congruent. (5) A. europaeus and A. jimmadseni are sister taxa and closer to each other than to A. fragilis. The genus is distributed in occurrences from the United States, Germany, and Portugal, and from the Late Kimmeridgian to the Late Tithonian, while the Cenomanian report from Japan is reidentified as Segnosaurus.
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5

Rodríguez-de la Rosa, Rubén A., Víctor M. Bravo-Cuevas, Enrique Carrillo-Montiel, and Arturo Ortiz-Ubilla. "Lower Cretaceous Dinosaur Tracks from Puebla, Mexico." Journal of Geological Research 2012 (February 28, 2012): 1–7. http://dx.doi.org/10.1155/2012/808729.

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Dinosaur tracks have been identified near San Martín Atexcal, southern Puebla, Mexico, within the sedimentary sequence of the San Juan Raya Formation of Lower Cretaceous (Albian) age. The tracksite, located in the bed of the Magdalena River, reveals six different ichnofossiliferous levels identified within a 9 m thick sedimentary sequence. The inferred environment is that of a tidal (marginal marine) mudflat (Level I). Level I preserves three theropods trackways (?Allosauroidea), additionally, isolated tracks belonging to iguanodontids (Ornithopoda). Level II preserves faint iguanodontid tracks. Levels III to V preserve sauropod tracks. Younger level VI preserves, although morphologically different, a track belonging to Ornithopoda. The dinosaur tracks from San Martín Atexcal support the existence of continental facies within the San Juan Raya Formation; they represent the second record of dinosaur tracks from the Lower Cretaceous of Mexico and are part of an important but little documented record of Lower Cretaceous dinosaurs in Mexico.
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6

Hendrickx, Christophe, Josef Stiegler, Philip J. Currie, et al. "Dental anatomy of the apex predator Sinraptor dongi (Theropoda: Allosauroidea) from the Late Jurassic of China." Canadian Journal of Earth Sciences 57, no. 9 (2020): 1127–47. http://dx.doi.org/10.1139/cjes-2019-0231.

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The dental morphology of the holotype of the theropod Sinraptor dongi from the Jurassic Shishugou Formation of China is comprehensively described. We highlight a combination of dental features that appear to be restricted to Sinraptor: (i) crowns with denticulated mesial and distal carinae extending from the root and an irregular surface texture on the enamel; (ii) a D- to salinon-shaped cross-sectional outline at the crown base in mesialmost teeth; (iii) mesial crowns with mesial carinae spiraling mesiolingually and lingually positioned longitudinal groove adjacent to the mesial carina; and (iv) particularly labiolingually compressed lateral teeth with weakly labially deflected distal carinae, flat to concave basocentral surfaces of the labial margins of the crowns, and horizontally elongated distal denticles showing short to well-developed interdenticular sulci. Using cladistic, multivariate, discriminant, and cluster analyses, we demonstrate that the dentition of Sinraptor is relatively similar to that of ceratosaurids, megalosauroids, and other allosauroids and is particularly close to that of Allosaurus. The dental anatomy of Sinraptor and Allosaurus, which differs mainly in the labiolingual compression of the lateral crowns and in the number of premaxillary teeth, shows adaptations towards a predatory lifestyle, including premaxillary teeth capable of enduring tooth-to-bone contact and crowns with widely separated mesial and distal carinae capable of inflicting widely open wounds.
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7

Benson, Roger B. J., Matthew T. Carrano, and Stephen L. Brusatte. "A new clade of archaic large-bodied predatory dinosaurs (Theropoda: Allosauroidea) that survived to the latest Mesozoic." Naturwissenschaften 97, no. 1 (2009): 71–78. http://dx.doi.org/10.1007/s00114-009-0614-x.

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8

XI-JIN, ZHAO, ROGER B. J. BENSON, STEPHEN L. BRUSATTE, and PHILIP J. CURRIE. "The postcranial skeleton ofMonolophosaurus jiangi(Dinosauria: Theropoda) from the Middle Jurassic of Xinjiang, China, and a review of Middle Jurassic Chinese theropods." Geological Magazine 147, no. 1 (2009): 13–27. http://dx.doi.org/10.1017/s0016756809990240.

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AbstractThe Middle Jurassic was a critical time in the evolution of theropod dinosaurs, highlighted by the origination and radiation of the large-bodied and morphologically diverse Tetanurae. Middle Jurassic tetanurans are rare but have been described from Europe, South America and China. In particular, China has yielded a number of potential basal tetanurans, but these have received little detailed treatment in the literature. Here we redescribe the postcranial skeleton of one of the most complete Chinese Middle Jurassic theropods,Monolophosaurus. Several features confirm the tetanuran affinities ofMonolophosaurus, but the possession of ‘primitive’ traits such as a double-faceted pubic peduncle of the ilium and a hood-like supracetabular crest suggest a basal position within Tetanurae. This conflicts with most published cladistic analyses that placeMonolophosaurusin a more derived position within Allosauroidea. We review the Middle Jurassic record of Chinese theropods and compareMonolophosaurusto other Middle Jurassic theropods globally. These comparisons suggest thatMonolophosaurusandChuandongocoelurusformed an endemic theropod clade limited to the Middle Jurassic of Asia. Other Middle Jurassic Chinese theropods deserve further study.
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9

Royo-Torres, R., A. Cobos, and L. Alcalá. "Diente de un gran dinosaurio terópodo (Allosauroidea) de la Formación Villar del Arzobispo (Titónico-Berriasiense) de Riodeva (España)." Estudios Geológicos 65, no. 1 (2009): 91–99. http://dx.doi.org/10.3989/egeol.39708.049.

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10

Eddy, Drew R., and Julia A. Clarke. "New Information on the Cranial Anatomy of Acrocanthosaurus atokensis and Its Implications for the Phylogeny of Allosauroidea (Dinosauria: Theropoda)." PLoS ONE 6, no. 3 (2011): e17932. http://dx.doi.org/10.1371/journal.pone.0017932.

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Dissertations / Theses on the topic "Allosauroidea"

1

Eddy, Drew Richard. "A Re-Analysis of the Skull of Acrocanthosaurus atokensis (NCSM 14345): Implications for Allosauroid Morphology, Phylogeny, and Biogeography." NCSU, 2008. http://www.lib.ncsu.edu/theses/available/etd-06272008-015218/.

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Considerable debate has surrounded the phylogenetic position of the large-bodied theropod Acrocanthosaurus atokensis from the Early Cretaceous Antlers Formation of North America. Many phylogenetic analyses place Acrocanthosaurus as the sister taxon to the smaller- bodied Allosaurus, known from formations in North America and Europe, whereas others recover it as a member of Carcharodontosauridae, a derived group of large-bodied allosauroids that inhabited Gondwana. Re-examination of a well-preserved skull of Acrocanthosaurus (NCSM 14345) has provided new information regarding the morphology of the palatal complex and inner surfaces of the skull and mandible, features that were obscured by a sediment matrix during a previous description. From this revised description, twenty-three new characters were identified and added to a data matrix (164 characters; 17 terminals), the analysis of which recovered a single most parsimonious tree placing Acrocanthosaurus as a derived member of Carcharodontosauridae. This hypothesis is supported by several shared cranial characteristics, including: a sinuous medial groove for the maxillary dental lamina; a small accessory process between the quadratojugal prongs of the jugal; and a dorsal curvature of the jugal ramus of the ectopterygoid. The phylogeny recovered by this analysis fit significantly better with the stratigraphic record than previous hypotheses that place Acrocanthosaurus as more closely related to Allosaurus, a finding supported by visual assessment of phylograms and stratigraphic consistency metrics. An analysis of the paleobiogeography of Allosauroidea found Asia to be the most likely ancestral area for the clade, consistent with previous analyses. Distribution of carcharodontosaurid ancestors likely reached both North America and Gondwana during the Valanginian or Barremian stages, with Europe providing a connection between the two continents.
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