Alexis Mauro Aranciaga Rolando

Alexis Mauro Aranciaga Rolando
Museo Argentino de Ciencias Naturales "Bernardino Rivadavia" · laboratorio de anatomía comparada y evolución de los vertebrados

Gen. et. sp. indet.

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45
Publications
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548
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Publications

Publications (45)
Article
Full-text available
Anurans are characterized by a biphasic life cycle, with an aquatic larval (tadpole) stage followed by an adult (frog) stage, both connected through the metamorphic period in which drastic morphological and physiological changes occur¹. Extant tadpoles exhibit great morphological diversity and ecological relevance², but their absence in the pre-Cre...
Conference Paper
Full-text available
The primary function of the forelimbs of non-avian theropod dinosaurs is associated with diverse and often very demanding tasks, such as feeding and social behavior. Among the different clades of non-avian theropods, there are radically different forelimb morphologies that result in a wide variety of functional specializations, as they reflect a ba...
Article
Megaraptora is a group of enigmatic, carnivorous non‐avian theropod dinosaurs from the Cretaceous of Asia, Australia, and especially South America. Perhaps the most striking aspect of megaraptoran morphology is the large, robustly constructed forelimb that, in derived members of the clade, terminates in a greatly enlarged manus with hypertrophied,...
Article
Full-text available
Megaraptora is a theropod clade known from former Gondwana landmasses and Asia. Most members of the clade are known from the Early to Late Cretaceous (Barremian–Santonian), with Maastrichtian megaraptorans known only from isolated and poorly informative remains. The aim of the present contribution is to describe a partial skeleton of a megaraptorid...
Article
Full-text available
Here we describe a new hadrosaurid from the Upper Cretaceous (Campanian-Maastrichtian) Allen Formation of R ıo Negro Province, northwest Patagonia. The new taxon is based on cranial and postcranial elements from subadult and adult specimens. The new taxon may have reached 8-9 m in total body length, and it is diagnosed by a unique combination of ch...
Article
The deposits of the Chorrillo Formation (Maastrichtian) were accumulated during a ‘continental window’ that occurred during the Late Cretaceous in the Austral-Magallanes foreland basin, southern Patagonia, Argentina. The aim of the present contribution is to describe the depositional conditions as well as new vertebrate and plant fossils from this...
Preprint
Full-text available
Megaraptorans are a theropod clade distributed in former Gondwana landmasses and Asia. Most members of the clade are known from early Cretaceous to Turonian times whereas Maastrichtian megaraptorans are known just from isolated and poorly informative remains. The aim of present contribution is to describe a partial skeleton of a megaraptorid coming...
Article
The fossil record of the genus Bothrops is still sparse in South America. Most records belong to extant species recovered in strata not older than the late Pleistocene. The genus was also tentatively reported from the early Pliocene and earlymiddle Pleistocene of Buenos Aires province, Argentina, based on fragmentary specimens. The aim of the prese...
Article
The record of sauropods in the Upper Cretaceous of Patagonia is rich. However, there are still several blanks on this record. Here it is described a new sauropod assemblage coming from the Salitral Ojo de Agua Area, Río Negro province, northern Patagonia, Argentina (Allen Formation; Maastrichtian). Remains of indeterminate saltasaurines, aeolosauri...
Article
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Carcharocles megalodon is considered a macropredatory shark that inhabited the seas around the world from middle Miocene to late Pliocene. In Argentina, it has only been formally recorded at two localities. Here, we report the first record for this taxon in the Buenos Aires Province. This occurrence is based on an isolated tooth recovered on the be...
Article
Aerosteon riocoloradensis represents one of the most complete megaraptorans yet discovered. This theropod comes from Anacleto Formation (Campanian) of Mendoza Province, Argentina. The aims of this contribution are: to present a detailed, bone by bone description of this specimen with figures of each bone; provide comparisons to other closely relate...
Article
Abelisaurid theropods are well known in Cretaceous beds along South America, particularly Patagonia. However, the record of latest Cretaceous abelisauroids is still far from satisfactory. Until recently, few taxa were described from Maastrichtian beds: Carnotaurus sastrei and Quilmesaurus curriei, but also perhaps Abelisaurus comahuensis. In this c...
Article
Full-text available
In this article we investigate the contributions made by the art professor Alejandro Gavriloff (1914-1993), based on his artistic work which illustrated scientifc publications in the feld of natural sciences and natural history. In particular, we present the seven paintings in watercolors made by him that show representation sofliving fauna based on...
Article
Full-text available
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 divertic...
Article
Full-text available
The first fossil remains of vertebrates, invertebrates, plants and palynomorphs of the Chorrillo Formation (Austral Basin), about 30km to the SW of the town of El Calafate (Province of Santa Cruz), are described. Fossils include the elasmarian (basal Iguanodontia) Isasicursor santacrucensis gen. et sp. nov., the large titanosaur Nullotitan glaciari...
Article
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The enigmatic basal coelurosaur Bicentenaria argentina is a small theropod that comes from the Upper Cretaceous of Patagonia. It is constituted by more than 130 elements, including cranial remains. These are represented by an incomplete snout, palate, dermatocranium, and lower jaws still in articulation. The skull material of Bicentenaria was preli...
Article
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The aim of the present contribution is to describe a new genus and species of Pipoidea from the Huitrera Formation (Eocene) from Patagonia, Argentina. The new genus shows a unique combination of characters indicating that it is a valid taxon different from other pipimorphs, including the coeval Llankibatrachus truebae. The phylogenetic analysis res...
Article
Phylogenetic relationships of megaraptorid theropods are under intense debate. Some authors interpret them as archaic allosauroids that survived up to Late Cretaceous, whereas others consider megaraptorids as basal tyrannosauroids. The recently described Patagonian taxon Murusraptor barrosaensis offers novel information on skull, axial and hind lim...
Article
Pipimorpha is a clade of tongueless anurans with a wide fossil record. Furthermore, the oldest South American fossils come from the Late Cretaceous (Cenomanian) of Patagonia, Argentina. The aim of the present contribution is to describe a new genus and species of Pipimorpha from the Crato Formation (Aptian, Early Cretaceous), Araripe Basin, Brazil....
Conference Paper
Full-text available
The Violante’s Farm is a fossiliferous locality located in the northwest of the province of Río Negro, Argentina. In this lo-cality, the Huincul Formation (Neuquén Group, Cenomanian–Turonian, Upper Cretaceous) is widely exposed. Numerous vertebrate remains have been collected from this fossiliferous site and were recently published, including the e...
Article
A specimen composed of a partial sacrum articulated to two anterior caudal vertebrae and an ilium (SMNS 58023) from the Lower Cretaceous (Albian) Santana Formation of Brazil was originally described as an oviraptorosaur, but it is here re-interpreted as the oldest megaraptoran of South America. The phylogenetic relationships of SMNS 58023 were test...
Article
Full-text available
Neuquenraptor argentinus was described as the first undoubted deinonychosaurian theropod from Gondwana. The only known specimen is represented by a fragmentary skeleton, including a nearly complete foot, coming from Late Cretaceous beds of Neuquén Province, Patagonia, Argentina. Neuquenraptor was later considered as belonging to the Southern Hemisp...
Article
Full-text available
Novas, F.E., Aranciaga Rolando, A.M. and Agnolín, F.L. 2016. Phylogenetic relationships of the Cretaceous Gondwanan theropods Megaraptor and Australovenator: the evidence afforded by their manual anatomy. Memoirs of Museum Victoria 74: 49–61. General comparisons of the manual elements of megaraptorid theropods are conducted with the aim to enlarge...
Article
Full-text available
The present contribution describes theropod remains coming from the Huincul Formation (Neuquén Group; Cenomanian-Turonian; Upper Cretaceous) at a single locality located in northwestern Río Negro province, Patagonia, Argentina. This theropod association is composed of abelisauroids, two different-sized carcharodontosaurid allosauroids, a coelurosau...
Article
Full-text available
TALAMPAYA NATIONAL PARK, PROVINCE OF LA RIOJA, ARGENTINA. In this paper disclosed two new records of Crowned Eagle (Buteogallus coronatus) for the Talampaya National Park, La Rioja Province. The first record for the month of May 2013 consists of a pair of adult individuals, with a chick and the second in October 2014 of an adult and a nest. These r...
Conference Paper
Dentro de Sudamérica uno de los grupos de dinosaurios mejor representados es el de los terópodos. Dentro del continente, Patagonia posee uno de los registros más ricos de este grupo, tanto en abundancia como en diversidad. La nueva localidad se encuentra al noroeste de la provincia de Rio negro, Argentina, y cuenta con afloramientos de la Formación...
Conference Paper
Dentro de las escasas especies de ornitisquios registradas para Gondwana, Ornithopoda es el clado mejor conocido. En Patagonia y Antártida muchos de los representantes basales de este clado muestran características anatómicas en común, que sugieren su pertenencia a un clado monofilético. Talenkauen santacrucensis es un taxón representado por uno de...
Conference Paper
Full-text available
Megaraptorans is a clade known from Cretaceous strata from South America, Australia and Asia. Here we describe an incomplete foot and one right metatarsal III belonging to the same individual (Museo de Ciencias Naturales y Antropológicas Juan Cornelio Moyano, Mendoza; MCNA-PV-3138), coming from the Anacleto Formation, Neuquen Group (Santonian, Late...
Conference Paper
Full-text available
El presente trabajo consiste en un análisis anatómico detallado del miembro anterior de Megaraptor namunhuaiquii (MUCPv 595, MUCPv 1353 y MUCPv 341) un terópodo de 8 metros de largo proveniente del Cretácico Superior (Turoniano) de la provincia de Neuquén. Sus relaciones filogenéticas y la de especies cercanas son objeto de debate. Un exhaustivo an...
Conference Paper
En la siguiente presentación se dan a conocer datos adicionales acerca de un nuevo dinosaurio Iguanodontia. Los materiales aquí descriptos (MACN Pv-19777) consisten en un ejemplar compuesto por un miembro posterior izquierdo parcialmente conservado. Dichos materiales proceden de la Isla James Ross de la Antártida Argentina, y fueron recuperados en...

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