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Publications (40)
Azhdarchid pterosaurs in South America were hitherto represented by two taxa coming from Coniacian-Santonian and Maastrichtian beds, of the Mendoza and Río Negro provinces, respectively, in Argentina. Here we report an incomplete pterosaur cervical vertebra from Cenomanian beds exposed at the east shore of Ezequiel Ramos Mexía Reservoir at the Río...
Vegavis iaai is without any doubt the most complete and well-known Mesozoic bird from Antarctica. In spite of being known by several specimens, its highly specialized postcranial anatomy has obscured the recognition of its phylogenetic affinities. Skull material from Vegavis is scarce, and the lower jaw is known by a relatively well-preserved artic...
The Neogene avifauna record from San Juan Province is poorly known. The aim of the present contribution is the description of a new diverse Late Miocene assemblage from Las Flores Formation, cropping out in the area of Puchuzum in the Calingasta Valley (San Juan Province, Argentina). Bearing levels represent fluvial systems of meandering rivers and...
The most representative ankylosaurian remains from Argentina have been found in sediments of the Allen Formation (Campanian–Maastrichtian) in Salitral Moreno, Río Negro Province. Several authors have discussed the identity and history of these remains. In this study, we review all published material along with some new remains in order to summarize...
Enantiornithes were the dominant avialan clade in the Mesozoic. However, their record for the Upper Cretaceous is scarce. In this study, we present and describe Yatenavis ieujensis gen. et sp. nov., one of the youngest occurrence of an enantiornithine bird. The specimen, the distal half of a right humerus, was found in Chorrillo Formation, southern...
Vegavis iaai es una de las aves más completas y mejor conocidas del Cretácico de Antártida. A pesar de esto, su anatomía postcraneana altamente especializada dificulta deducir su posición filogenética. Los materiales craneanos son muy escasos, entre ellos se encuentra la región articular de una mandíbula y un pterigoides, ambos pertenecientes al ej...
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...
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...
The fossil record of Early Cretaceous birds in South America has been restricted to members of Enantiornithes from the Crato Formation (Aptian) of Brazil. Here we describe a new genus and species of bird discovered at Pedra Branca Mine, Nova Olinda County, Ceará State, Brazil, which adds to the avian fossil record from the Crato Formation. The spec...
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...
We describe the basal mesoeucrocodylian Burkesuchus mallingrandensis nov. gen. et sp., from th Upper Jurassic (Tithonian) Toqui Formation of southern Chile. The new taxon constitutes one of the few records of non-pelagic Jurassic crocodyliforms for the entire South American continent. Burkesuchus was found on the same levels that yielded titanosaur...
In 1976 John Ostrom published an enlightening paper about the anatomical transformations in the shoulder girdle and forelimb elements along the origin of birds. Most of his ideas were based on comparing Archaeopteryx lithographica with the extant New World vulture Cathartes aura. Ostrom offered innovative ideas about range of movements and function...
The fossil record of ornithischians in South America is sparse, and they are clearly underrepresented when compared with sauropod dinosaurs. However, recent discoveries indicate that ornithischians were more diversified than thought. The aim of the present contribution is to describe isolated remains belonging to ankylosaurs, and ornithopods, inclu...
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...
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...
La presente contribución se centra en la histología ósea de dos ornitópodos antárticos de
la Formación Snow Hill Island (Maastrichtiano-Campaniano), Trinisaura
santamartaensis y Morrosaurus antarcticus. El objetivo es establecer el estadio
ontogenético de ambos taxones, así como determinar si su crecimiento presenta
diferencias significativas con f...
Talenkauen santacrucensis represents one of the most complete South American ornithopods yet discovered. This dinosaur comes from the Mata Amarilla Formation (Turonian) of Santa Cruz Province, Argentina. The aim of this contribution is to present a detailed description of Talenkauen santacrucensis. Features of the cervical series of Talenkauen, whi...
Short Note Were ibises (Aves, Threskiornithidae) present in Antarctica? - Volume 31 Issue 1 - Federico Lisandro Agnolin, Sergio Bogan, Sebastián Rozadilla
Since its original description as a feather belonging to a basal bird, the phylogenetic position of Praeornis
sharovi was debated. It was considered as belonging to a bird, a cycad leaf, or as a ‘transitional’ integumentary
structure between reptile scales and bird feathers. Recently, a basal enantiornithine bird was collected in
Early Cretaceous b...
Pisanosaurus mertii was originally described on the basis of an incomplete skeleton from the early Late Triassic (Carnian) of northern Argentina. It is consistently regarded by most authors as a very basal ornithischian, the sister group of remaining members of the clade. The referral to Ornithischia is based mainly on tooth-bearing bones and tooth...
En este trabajo se presentan nuevos registros de aves para la costa rioplatense de los partidos de Quilmes y Avellaneda (Provincia de Buenos Aires, Argentina). La zona estudiada incluye dos áreas protegidas: Reserva Natural Municipal Los Sauces y el Parque Natural y Reserva Ecológica Municipal Selva Marginal Quilmeña, como también sectores sin cate...
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...
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...
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...
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...
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...
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...
