Aniksosaurus darwini gen. et sp. nov., a new coelurosaurian theropod from the Early Late Cretaceous of Central Patagonia, Argentina

Martı́nez, Rubén D.; Novas, Fernando E.

doi:10.22179/revmacn.8.325

Cited by 33 publications

(31 citation statements)

References 24 publications

(35 reference statements)

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“…Nevertheless, Aniksosaurus differs from the latter one in having limb bones proportionally more robust, especially regarding the humerus and femur. The ilium of Aniksosaurus clearly differs from Bicentenaria in having a greatly expanded and flaring outwards brevis shelf (Martínez & Novas, 2006). The femur of Aniksosaurus differs from that of Bicentenaria in lacking a welldeveloped mediodistal crest, and a deep posteromedial sulcus for the passage of the Lig.…”

Section: Discussionmentioning

confidence: 89%

“…The Lower Bajo Barreal Formation yielded the remains of the basal coelurosaur Aniksosaurus darwini (Martínez & Novas, 2006), with a body size somewhat smaller than its roughly coeval Bicentenaria. Nevertheless, Aniksosaurus differs from the latter one in having limb bones proportionally more robust, especially regarding the humerus and femur.…”

Section: Discussionmentioning

confidence: 99%

“…In the present analysis, the Brazilian Mirischia (Naish et al, 2004) and the South African Nqwebasaurus (De Clerk et al, 2000) are nested within Compsognathidae, indicating a cosmopolitan distribution for this family during, at least, the Early Cretaceous. The problematic Brazilian Santanaraptor (Kellner, 1999) & Novas, 2006). The body size of all these basal coelurosaurs is considerably smaller than those of non-coelurosaurian averostrans, such as ceratosaurians, spinosauroids, and allosauroids.…”

Section: Discussionmentioning

confidence: 99%

“…The discovery of multiple individuals in a single monospecific quarry (interpreted as indicative of gregarious habits) have been usually documented among non-avian theropods (Horner, 1997), being present in at least seven non-avian theropod taxa: coelophysoids (Colbert, 1990), ceratosaurians (Xu et al, 2009), carcharodontosaurids (Coria & Currie, 2006), Aniksosaurus (Martínez & Novas, 2006), tyrannosauroids (Currie, 2000;Eberth & McCrea, 2002), ornithomimosaurids (Kobayashi & Lü, 2003), troodontids (Varricchio, 1995), and dromaeosaurids (Roach & Brinkman, 2007). Thus, based on available evidence, a gregarious behaviour seems to represent an ancestral ethological condition for Theropoda, if not Dinosauria as a whole.…”

Section: Discussionmentioning

confidence: 99%

“…The femur of Bicentenaria is long and slender (a composite restoration indicates a maximum length of approximately 31 cm), differing from the robust condition of basal tetanurans (e.g., Allosaurus; Madsen, 1976) and Aniksosaurus (Martínez & Novas, 2006). The femur of Bicentenaria (Fig.…”

Section: Systematicsmentioning

confidence: 99%

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New Patagonian Cretaceous theropod sheds light about the early radiation of Coelurosauria

Novas¹,

Ezcurra²,

Agnolín³

et al. 2012

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Abstract:Here we describe a new theropod, Bicentenaria argentina nov. gen. et nov. sp., from the early Late Cretaceous of Patagonia. It is represented by more than a hundred bones belonging to different sized individuals, which were buried together in disarticulation after little transportation. The available association of skeletal elements suggests a gregarious behaviour for Bicentenaria, an ethological trait also recorded among other theropod clades. Increasing documentation of monospecific assemblages of different groups of theropods suggests that a gregarious behaviour may have constituted the ancestral condition for Theropoda, at least. Bicentenaria characterizes for the surangular bone with a high dorsal margin and a prominent lateral shelf, a retroarticular process that is low, wide and spoon-shaped, and quadrate bone with its lateral condyle larger than the medial one. Phylogenetic analysis found the Chinese Tugulusaurus and the Patagonian Bicentenaria as successive sister taxa of all other coelurosaurs, thus revealing the importance of the new taxon in the understanding of the early diversification of Coelurosauria. In particular, Bicentenaria amplifies the array of basal coelurosaurs that inhabited Gondwana during the Cretaceous, also including compsognathids, Aniksosaurus and Santanaraptor. Although still restricted to a handful of forms, available information indicates that Gondwana was a cradle for the evolution of different lineages of basal coelurosaurs, different from those documented in Upper Cretaceous beds in the northern landmasses. Analysis of body size distribution in averostran theropods results in the identification of two main episodes of drastic size reduction in the evolutionary history of Coelurosauria: one occurred at the initial radiation of the group (as represented by Bicentenaria, Zuolong, Tugulusaurus, compsognathids, and Aniksosaurus), and a second episode occurred at the early diverification of Paraves or avialans. Reduction in body size may have allowed adult coelurosaurians to exploit ecological niches not occupied before by larger basal averostrans.Key words: Coelurosauria, gregarism, body size reduction, Cretaceous, South America.Resumen: Nuevo terópodo del Cretácico de Patagonia brinda nuevas evidencias acerca de la radiación temprana de Coelurosauria. En la presente contribución se describe el nuevo terópodo Bicentenaria argentina nov. gen. et nov. sp., del Cretácico Tardío temprano de Patagonia. El nuevo taxón se encuentra representado por más de una centena de huesos pertenecientes a individuos de diferentes tamaños, los cuales fueron enterrados todos juntos en desarticulación, luego de un leve transporte. La asociación disponible de materiales sugiere hábitos gregarios para Bicentenaria, un rasgo etológico también registrado en otros clados de terópodos. La documentación recurrente de asociaciones monoespecíficas de diferentes grupos de terópodos sugiere que los hábitos gregarios pudieron haber constituido la condición ancestral para Theropoda. Bicentenaria se caract...

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Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Systematicsmentioning

confidence: 99%

See 3 more Smart Citations

New Patagonian Cretaceous theropod sheds light about the early radiation of Coelurosauria

Novas¹,

Ezcurra²,

Agnolín³

et al. 2012

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Dinosaurs in the Year of Darwin

Dodson

2009

The Anatomical Record

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This special issue of The Anatomical Record explores the recent advances in the functional morphology and paleobiology of dinosaurs. Although Darwin did not study dinosaurs because paleontology was in its infancy a century and half ago, he considered both paleontology and anatomy as essential subjects for establishing the validity of evolution. The study of dinosaurs constitutes a vigorous subdiscipline within vertebrate paleontology, and anatomists and evolutionary functional morphologists constitute an especially creative subgroup within dinosaur paleontology. The collection of 17 papers presented in this issue encompass cranial anatomy, postcranial anatomy, and paleobiology of dinosaurs and other archosaurs. Soft tissue subjects include studies of brain structure, jaw adductor muscles, and keratinous appendages of the skull. Taxonomically, it includes four papers with a focus on theropods, including Tyrannosaurus, five papers dealing with ceratopsians, three papers on hadrosaurs, and one on ankylosaurs. Modern anatomical techniques such as CT scanning, finite element analysis, and high resolution histology are emphasized. The visual presentation of results of these studies is spectacular. Results include the first-ever life history table of a plant-eating dinosaur; a determination of the head orientation of Tyrannosaurus and its relatives based on interpretation of the semicircular canals. The claws of Velociraptor appear to best adapted for tree climbing, but not for horrific predatory activities. Pachyrhinosaurus evidently used its massive head for head butting. The tail club of the armored dinosaur Euoplocephalus had the structural integrity to be used as a weapon. The pages abound with insights such as these. Dinosaurs once dead for millions of years live again! Anat Rec, 292:1240Rec, 292: -1245Rec, 292: , 2009. V V C 2009 Wiley-Liss, Inc.

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The first crocodyliform from the Chubut Group (Chubut Province, Argentina) and its phylogenetic position within basal Mesoeucrocodylia

Leardi¹,

Pol²

2009

Cretaceous Research

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Aniksosaurus darwini gen. et sp. nov., a new coelurosaurian theropod from the Early Late Cretaceous of Central Patagonia, Argentina

Cited by 33 publications

References 24 publications

New Patagonian Cretaceous theropod sheds light about the early radiation of Coelurosauria

New Patagonian Cretaceous theropod sheds light about the early radiation of Coelurosauria

Dinosaurs in the Year of Darwin

The first crocodyliform from the Chubut Group (Chubut Province, Argentina) and its phylogenetic position within basal Mesoeucrocodylia

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