Unquillosaurus ceibali Powell, a giant maniraptoran (Dinosauria, Theropoda) from the Late Cretaceous of Argentina

Novas, Fernando E.; Agnolín, Federico

doi:10.22179/revmacn.6.73

Cited by 18 publications

(6 citation statements)

References 5 publications

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“…The new Patagonian taxon, together with the previously recorded evidence, indicates that by Maastrichtian times southern South America was populated by large coelurosaurians belonging to different lineages, including the basal coelurosaurian Orkoraptor (see Novas et al 2008), the derived maniraptoran Unquillosaurus (see Novas & Agnolin 2004) and the unenlagiine Austroraptor. This record is in agreement with previous ideas suggesting that large-sized coelurosaurians became common after the loss of dominance of carcharodontosaurid tetanurans ( Leanza et al 2004).…”

Section: Discussionmentioning

confidence: 58%

A bizarre Cretaceous theropod dinosaur from Patagonia and the evolution of Gondwanan dromaeosaurids

et al. 2008

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Fossils of a predatory dinosaur provide novel information about the evolution of unenlagiines, a poorly known group of dromaeosaurid theropods from Gondwana. The new dinosaur is the largest dromaeosaurid yet discovered in the Southern Hemisphere and depicts bizarre cranial and postcranial features. Its long and low snout bears numerous, small-sized conical teeth, a condition resembling spinosaurid theropods. Its short forearms depart from the characteristically long-armed condition of all dromaeosaurids and their close avian relatives. The new discovery amplifies the range of morphological disparity among unenlagiines, demonstrating that by the end of the Cretaceous this clade included large, short-armed forms alongside crow-sized, long-armed, possibly flying representatives. The new dinosaur is the youngest record of dromaeosaurids from Gondwana and represents a previously unrecognized lineage of large predators in Late Cretaceous dinosaur faunas mainly dominated by abelisaurid theropods.

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Section: Discussionmentioning

confidence: 58%

A bizarre Cretaceous theropod dinosaur from Patagonia and the evolution of Gondwanan dromaeosaurids

et al. 2008

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“…During the last decade, many new types of theropod dinosaurs have been described from the Upper Cretaceous sediments of South America. These include abelisauroids [ 1 – 12 ], carcharodontosaurids [ 13 – 15 ], dromaeosaurids [ 16 – 18 ] and an assortment of species whose affinities are less certain [ 19 – 20 ].…”

Section: Introductionmentioning

confidence: 99%

A New Megaraptoran Dinosaur (Dinosauria, Theropoda, Megaraptoridae) from the Late Cretaceous of Patagonia

Coria

Currie

2016

PLoS ONE

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A skeleton discovered in the Upper Cretaceous Sierra Barrosa Formation (Turonian-Coniacian) of Neuquén Province, Argentina represents a new species of theropod dinosaur related to the long snouted, highly pneumatized Megaraptoridae. The holotype specimen of Murusraptor barrosaensis n.gen et n.sp. (MCF-PVPH-411) includes much of the skull, axial skeleton, pelvis and tibia. Murusraptor is unique in having several diagnostic features that include anterodorsal process of lacrimal longer than height of preorbital process, and a thick, shelf-like thickening on the lateral surface of surangular ventral to the groove between the anterior surangular foramen and the insert for the uppermost intramandibular process of the dentary. Other characteristic features of Murusraptor barrosaensis n.gen. et n. sp.include a large mandibular fenestra, distal ends of caudal neural spines laterally thickened into lateral knob-like processes, short ischia distally flattened and slightly expanded dorsoventrally. Murusraptor belongs to a Patagonian radiation of megaraptorids together with Aerosteon, Megaraptor and Orkoraptor. In spite being immature, it is a larger but more gracile animal than existing specimens of Megaraptor, and is comparable in size with Aerosteon and Orkoraptor. The controversial phylogeny of the Megaraptoridae as members of the Allosauroidea or a clade of Coelurosauria is considered analyzing two alternative data sets.

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“…The presence of these taxa in the Cretaceous period of South America and Africa dismisses the previous hypothesis 21 claiming that deinonychosaurians were endemic from Laurasia. Moreover, the Gondwanan record of non-avian maniraptorans is also formed by presumed oviraptorosaurs 22 , alvarezsaurids (Patagonykus, Alvarezsaurus) 23,24 and bizarre representatives of large size 25,26 . This information strongly supports the hypothesis that an important adaptive radiation of maniraptoran theropods took place in the southern continents during the Cretaceous period.…”

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confidence: 99%

New evidence on deinonychosaurian dinosaurs from the Late Cretaceous of Patagonia

Novas

Pol

2005

Nature

104

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Most of what is known about the evolution of deinonychosaurs (that is, the group of theropods most closely related to birds) is based on discoveries from North America and Asia. Except for Unenlagia comahuensis and some fragmentary remains from northern Africa, no other evidence was available on deinonychosaurian diversity in Gondwana. Here we report a new, Late Cretaceous member of the clade, Neuquenraptor argentinus gen. et sp. nov., representing uncontroversial evidence of a deinonychosaurian theropod in the Southern Hemisphere. The new discovery demonstrates that Cretaceous theropod faunas from the southern continents shared greater similarity with those of the northern landmasses than previously thought. Available evidence suggests that deinonychosaurians were probably distributed worldwide at least by the beginning of the Cretaceous period. The phylogenetic position of the new deinonychosaur, as well as other Patagonian coelurosaurian theropods, is compatible with a vicariance model of diversification for some groups of Gondwanan and Laurasian dinosaurs.

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Unquillosaurus ceibali Powell, a giant maniraptoran (Dinosauria, Theropoda) from the Late Cretaceous of Argentina

Cited by 18 publications

References 5 publications

A bizarre Cretaceous theropod dinosaur from Patagonia and the evolution of Gondwanan dromaeosaurids

A bizarre Cretaceous theropod dinosaur from Patagonia and the evolution of Gondwanan dromaeosaurids

A New Megaraptoran Dinosaur (Dinosauria, Theropoda, Megaraptoridae) from the Late Cretaceous of Patagonia

New evidence on deinonychosaurian dinosaurs from the Late Cretaceous of Patagonia

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