A new abelisaurid from the Huincul Formation (Cenomanian-Turonian; Upper Cretaceous) of Río Negro province, Argentina

Cerroni, Mauricio A.; Motta, Matías J.; Agnolín, Federico; Rolando, Alexis Mauro Aranciaga; Egli, Federico Brissón; Novas, Fernando E.

doi:10.1016/j.jsames.2019.102445

Cited by 17 publications

(8 citation statements)

References 36 publications

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“…The Violante Farm Locality houses a large variety of carnivorous theropods such as the mid‐sized abelisaurid Tralkasaurus (Cerroni et al ., 2020), large‐sized carcharodontosaurid Taurovenator (Motta et al ., 2016), mid‐sized megaraptoran Aoniraptor (Motta et al ., 2016) and a small‐sized paravian (Motta et al, 2020), as well as the enigmatic Gualicho (Apesteguía et al ., 2016). In the original description, Apesteguía and collaborators placed Gualicho at the base of Coelurosauria, very close to Megaraptora.…”

Section: Discussionmentioning

confidence: 99%

Histology and pneumaticity of Aoniraptor libertatem (Dinosauria, Theropoda), an enigmatic mid‐sized megaraptoran from Patagonia

2020

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Aoniraptor libertatem is a mid‐sized megaraptoran that comes from the Late Cretaceous (Turonian) Huincul Formation at Río Negro province, Patagonia, Argentina. In this study, we conducted a detailed analysis of pneumaticity of the sacrum and tail of Aoniraptor. This shows a complex structure within these vertebrae, being composed by small diverticulae surrounding large pneumatic canals and a central chamber that opens outside through pleurocoels or pneumatic canals. Further, we carried out a histologic analysis which confirms the pneumatic nature of these anatomical features. Both analyses found that chevrons in Aoniraptor were invaded by pneumaticity, a feature that appears to be unique to this taxon. In addition, a comparative analysis between Aoniraptor and other theropods (e.g. Gualicho and other megaraptorans) was carried out. This resulted in the modification of previous schemes about the evolution of pneumaticity through Theropoda, the finding of some evolutionary pneumatic traits through Megaraptora, and the usefulness of pneumatic traits as a taxonomic tool.

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Section: Discussionmentioning

confidence: 99%

Histology and pneumaticity of Aoniraptor libertatem (Dinosauria, Theropoda), an enigmatic mid‐sized megaraptoran from Patagonia

2020

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“…Pleurocoels are uncommon in the caudal vertebrae of theropods [33]. Although few megaraptorid caudal vertebrae are known, pleurocoels are present in Aerosteon [29], Megaraptor [32], Orkoraptor [33] and Aoniraptor [37]. Caudal pleurocoels are absent in the immediate outgroups to Megaraptoridae (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…The spatio-temporal range of Megaraptora (and Megaraptoridae) is becoming ever better understood as a result of numerous discoveries made within the last 2 decades. The South American record is the most extensive, diverse and abundant, with six taxa named to date: Aoniraptor libertatem [37], Orkoraptor burkei [33], Megaraptor namunhuaiquii [32,38,39], Murusraptor barrosaensis [30,40,41], Aerosteon riocoloradensis [28], and Tratayenia rosalesi [42]. Numerous fragmentary specimens have also been reported from South America (see supplementary table 7 in [1]), which include the oldest (Albian [43]) and the youngest (Campanian [44]).…”

Section: Introductionmentioning

confidence: 99%

“…The Asian record of megaraptorans is steadily improving, with occurrences in Japan (Fukuiraptor kitadaniensis) [31,45], China (Chilantaisaurus tashukouensis) [46,47] and Thailand (Phuwiangvenator yaemniyomi and possibly Vayuraptor nongbualamphuensis) [48]. No megaraptorans are known from Antarctica, Europe or Africa (unless Bahariasauridae is a subclade of Megaraptora [37]) and only one taxon (Siats meekerorum [49]) is known from North America. Of these discoveries the best source of understanding megaraptoran skeletal anatomy have come from Australia and Argentina, thereby facilitating the identification of isolated and or fragmentary megaraptorid material.…”

Section: Introductionmentioning

confidence: 99%

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New theropod remains and implications for megaraptorid diversity in the Winton Formation (lower Upper Cretaceous), Queensland, Australia

et al. 2020

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The holotype specimen of the megaraptorid Australovenator wintonensis , from the Upper Cretaceous Winton Formation (Rolling Downs Group, Eromanga Basin) of central Queensland, is the most complete non-avian theropod found in Australia to date. In fact, the holotype of A. wintonensis and isolated megaraptorid teeth (possibly referable to Australovenator ) constitute the only theropod body fossils reported from the Winton Formation. Herein, we describe a new fragmentary megaraptorid specimen from the Winton Formation, found near the type locality of A. wintonensis . The new specimen comprises parts of two vertebrae, two metatarsals, a pedal phalanx and multiple unidentifiable bone fragments. Although the new megaraptorid specimen is poorly preserved, it includes the only megaraptorid vertebrae known from Queensland. The presence of pleurocoels and highly pneumatic caudal centra with camerate and camellate internal structures permit the assignment of these remains to Megaraptora gen. et sp. indet. A morphological comparison revealed that the distal end of metatarsal II and the partial pedal phalanx II-1 of the new specimen are morphologically divergent from Australovenator . This might indicate the presence of a second megaraptorid taxon in the Winton Formation, or possibly intraspecific variation.

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“…The specimen comes from beds of the Huincul Formation (middle Cenomanian-early Turonian; Garrido 2010), cropping out at 39°23′52.37″ S, 68°37′4.30″ W, southeast of the Ezequiel Ramos-Mexía lake, NW Río Negro province, Argentina (the fossil locality is historically known as "Violante farm"). These beds have yielded remains of different theropod clades, including Carcharodontosauridae (i.e., Mapusaurus rosae and Taurovenator violantei) (Coria and Currie 2006;Motta et al 2016), Abelisauridae (i.e., Ilokelesia aguadagrandensis, Skorpiovenator bustingorryi, Huinculsaurus montesi, and Tralkasaurus cuyi) (Coria and Salgado 1998, Canale et al 2009, Baiano et al 2020, Cerroni et al 2020, and Megaraptora (i.e., Gualicho shinyae and Aoniraptor libertatem) (Apesteguía et al 2016, Motta et al 2016.…”

Section: Locality and Horizonmentioning

confidence: 99%

New theropod dinosaur from the Upper Cretaceous of Patagonia sheds light on the paravian radiation in Gondwana

Motta

Agnolín

Egli

et al. 2020

Sci Nat

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The fossil record of basal paravians in Gondwana is still poorly known, being limited to the Cretaceous unenlagiids from South America and the problematic Rahonavis from Madagascar. Here we report on a new paravian from the Cenomanian-Turonian (Late Cretaceous) of Río Negro province, NW Patagonia, Argentina. The new taxon exhibits a derived bird-like morphology of the forelimbs (e.g., robust ulna with prominent, anteriorly oriented, and proximally saddle-shaped radial cotyle and wide medial flange on metacarpal I) and a plesiomorphic foot with a raptorial pedal digit II. Phylogenetic analysis recovers the new taxon in a monophyletic clade with Rahonavis, being the sister group of the remaining Avialae and more derived than other non-avian dinosaurs. Both exhibit derived forelimb traits in opposition with their plesiomorphic hind limbs. The position of the new taxon and Rahonavis as stem avialans indicates that Gondwanan basal paravians are represented by two different clades, at least. The new taxon probably constitutes a previously unknown grade in the avian-line theropods in which some flight-related adaptations of the forelimbs are present in cursorial taxa. The present discovery sheds light on the acquisition of flight-related traits in nonavian dinosaurs and on the still poorly known paravian radiation in Gondwana.

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A new abelisaurid from the Huincul Formation (Cenomanian-Turonian; Upper Cretaceous) of Río Negro province, Argentina

Cited by 17 publications

References 36 publications

Histology and pneumaticity of Aoniraptor libertatem (Dinosauria, Theropoda), an enigmatic mid‐sized megaraptoran from Patagonia

Histology and pneumaticity of Aoniraptor libertatem (Dinosauria, Theropoda), an enigmatic mid‐sized megaraptoran from Patagonia

New theropod remains and implications for megaraptorid diversity in the Winton Formation (lower Upper Cretaceous), Queensland, Australia

New theropod dinosaur from the Upper Cretaceous of Patagonia sheds light on the paravian radiation in Gondwana

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