Books by Sebastián Apesteguía
This work relates the dinosaur faunas from the Triángulo Minero, in center-south Brazil, the Nort... more This work relates the dinosaur faunas from the Triángulo Minero, in center-south Brazil, the Norte Basin in western Uruguay and those from the Neuquina Basin, in the Argentinian Patagonia. The bioestratigraphical and biochronological comparison, considering not only those taxa efectively found but also those absent but frequent in other basins allow discussing the age and distribution relationships among the three basins. It is discussed the assignation of post-Coniacian isolated teeth to Carcharodontosauridae as well as the purported spinosaurs in Argentina. Other materials are evaluated as that of Entre Ríos, an Argentinian part of the Norte Basin of Uruguay, as well as materials from deinonychosaurs, neovenatorids, ankylosaurs, hadrosaurids and sauropods, particularly those assigned to the genus Aeolosaurus. Egg material is included too.
Este trabajo relaciona las faunas de dinosaurios del Triángulo Minero, en el centro-sur de Brasil, los de la Cuenca Norte en el oeste de Uruguay y los de la Cuenca Neuquina, en la Patagonia argentina. La comparación bioestratigráfica y biocronológica, teniendo en cuenta no solo los taxones presentes sino también aquellos ausentes que son frecuentes en otras cuencas permiten discutir las relaciones de edad y de distribución entre las tres cuencas. Se discute la asignación de dientes aislados post-Coniacianos a Carcharodontosauridae así como los supuestos espinosaurios de Argentina. Otros materiales son evaluados, como aquellos de Entre Ríos, parte argentina de la Cuenca Norte de Uruguay, así como materiales de deinonicosaurios, neovenatóridos, anquilosaurios, hadrosáuridos y saurópodos, particularmente del género Aeolosaurus. Se incluyen los materiales de huevos.
Nuestros Dinosaurios Sauropodos
Nuestros Dinosaurios Ornitisquios
Vida en Evolución
Una obra imprescindible que reúne los últimos conocimientos sobre la evolución de la vida en nues... more Una obra imprescindible que reúne los últimos conocimientos sobre la evolución de la vida en nuestro planeta, desde sus orígenes hasta nuestros días. Por primera vez se describen estos temas con ejemplos tomados de la Argentina y Sudamérica con un lenguaje ameno y didáctico, profusamente ilustrado con gráficos, fotografías y dibujos accesibles para todas las edades. Opiniones sobre el Libro: “La actualización de conocimientos que brinda este libro, en una secuencia ordenada y con un lenguaje didáctico, accesible, es resultado del rápido progreso de las disciplinas involucradas que en gran parte no son publicadas por medios accesibles”. Dr. José F. Bonaparte. Investigador Superior del CONICET. / “Encontré en este libro a uno de esos especímenes raros –tanto como algunas de las criaturas prehistóricas mencionadas en sus páginas–, en donde se conjuga hábilmente erudición y amenidad; disfruté mucho leerlo, y seguramente vos lector, también lo harás, tengas la edad que tengas... Los ejemplos tomados en su mayoría de nuestra región, hacen que este libro sea imprescindible”. Dr. Leonardo Salgado. Investigador Independiente del CONICET.
Papers by Sebastián Apesteguía
Lepidosaurs from Gondwana: An Introduction
Journal of Herpetology, 2017
Lepidosaurian reptiles (squamates and rhynchocephalians) comprise one of the world’s most diverse... more Lepidosaurian reptiles (squamates and rhynchocephalians) comprise one of the world’s most diverse groups of tetrapods, with most of that diversity found in regions of the world that once formed the supercontinent of Gondwana. In this special section of the
Journal of Herpetology, we present both review and original studies on the evolution of lepidosaurs from Gondwana. In this contribution, we provide a brief introduction to those studies and also present metadata collected from the Web of Science on the progress of the study of lepidosaurian evolution. The latter indicate a substantial increase of research interest in multiple aspects of lepidosaur evolution worldwide, with special increase for lepidosaurs from Gondwanan continents. We conclude by setting some of the main goals we hope to achieve in the study of lepidosaurs from Gondwana in the near future.
New materials from sauropods from the Portezuelo Hill (Neuquén Province, Argentina) are described... more New materials from sauropods from the Portezuelo Hill (Neuquén Province, Argentina) are described. They consist on three vertebrae and a metacarpus belonging to the Portezuelo Formation, considered as belonging to the Neuquenian Tetrapod Assemblage. They are consistent with an intermediate stage between the diplodocoid-dominated Limayan assemblages and the saltasaurines of the last endemic Coloradoan assemblage of younger beds.
Journal of Vertebrate Paleontology Publication details, including instructions for authors and su... more Journal of Vertebrate Paleontology Publication details, including instructions for authors and subscription information:
Diplodocids are by far the most emblematic sauropod dinosaurs. They are part of Diplodocoidea, a ... more Diplodocids are by far the most emblematic sauropod dinosaurs. They are part of Diplodocoidea, a vast clade whose other members are well-known from Jurassic and Cretaceous strata in Africa, Europe, North and South America. However, Diplodocids were never certainly recognized from the Cretaceous or in any other southern land mass besides Africa. Here we report a new sauropod, Leikupal laticauda gen. et sp. nov., from the early Lower Cretaceous (Bajada Colorada Formation) of Neuquén Province, Patagonia, Argentina. This taxon differs from any other sauropod by the presence of anterior caudal transverse process extremely developed with lateroventral expansions reinforced by robust dorsal and ventral bars, very robust centroprezygapophyseal lamina in anterior caudal vertebra and paired pneumatic fossae on the postzygapophyses in anterior-most caudal vertebra. The phylogenetic analyses support its position not only within Diplodocidae but also as a member of Diplodocinae, clustering together with the African form Tornieria, pushing the origin of Diplodocoidea to the Middle Jurassic or even earlier. The new discovery represents the first record of a diplodocid for South America and the stratigraphically youngest record of this clade anywhere.
PLoS ONE, 2012
Ecological relationships among fossil vertebrate groups are interpreted based on evidence of modi... more Ecological relationships among fossil vertebrate groups are interpreted based on evidence of modification features and paleopathologies on fossil bones. Here we describe an ichnological assemblage composed of trace fossils on reptile bones, mainly sphenodontids, crocodyliforms and maniraptoran theropods. They all come from La Buitrera, an early Late Cretaceous locality in the Candeleros Formation of northwestern Patagonia, Argentina. This locality is significant because of the abundance of small to medium-sized vertebrates. The abundant ichnological record includes traces on bones, most of them attributable to tetrapods. These latter traces include tooth marks that provde evidence of feeding activities made during the sub-aerial exposure of tetrapod carcasses. Other traces are attributable to arthropods or roots. The totality of evidence provides an uncommon insight into paleoecological aspects of a Late Cretaceous southern ecosystem.
VERTEBRATES OF THE PASO DEL SAPO FORMATION (CAMPANIANO/MAASTRICHTIANO), CHUBUT PROVINCE, ARGENTINA
AMEGHINIANA
VERTEBRATES OF THE PASO DEL SAPO FORMATION (CAMPANIANO/MAASTRICHTIANO), CHUBUT PROVINCE, ARGENTINA
AMEGHINIANA
The Toro Toro tracksite reveals long sauropod, theropod, and ornithischian trackways on Late Cret... more The Toro Toro tracksite reveals long sauropod, theropod, and ornithischian trackways on Late Cretaceous limestones from the Lower Member of the El Molino Formation (Middle Maastrichtian), deposited in a lacustrine environment, also related to shallow marine conditions. The rocks outcrop at the left margin of the Toro Toro river, before joning the Mayu Mayu river, in the Toro Toro National Park, Bolivia. It is one of the few globally known Latest Cretaceous dinosaur tracksites. Some of the observed theropod trackways belong to a taxon whose inner toe is reduced in length to bear a distal bump. The same morphology was recognised in three different trackways and an isolated track, all of them in the same area and showing both left and right specimens, accounting for a total of nine footprints produced by a bipedal trackmaker that left tridactyl footprints, notably asymmetric respect to the central axis of the digit III impression, with no hallux preserved, most of the cases with poor t...
The tetrapod assemblage of the Bajo de la Carpa Formation (Late Cretaceous; Santonian-early Campa... more The tetrapod assemblage of the Bajo de la Carpa Formation (Late Cretaceous; Santonian-early Campanian) is dominated by archosaurs, represented by saurischians, such as alvarezsaurid, enanthiornithine, and abelisauroid theropods (e.g. Velocisaurus unicus Bonaparte, 1991) and titanosaurs (e.g. Bonitasaura salgadoi Apesteguía, 2004), as well as crocodyliform remains which are the most abundant specimens (e.g. Notosuchus terrestris Woodward, 1896). Here we report new archosaur remains from the Bajo de la Carpa Formation at the ‘La Bonita’ locality, consisting of isolated shed teeth. Two of these specimens present a crown with a straight distal border and denticles with shape and density similar to that observed in abelisaurid theropods. A third tooth is more distally curved, without mesial denticles, and with a figure eight shaped basal cross-section, resembling the dental features described for the basal tetanuran Orkoraptor burkei Novas, Ezcurra and Lecuona, 2008, but differing from t...
AMEGHINIANA
Introducción El territorio argentino ha brindado un amplio y diverso registro de dinosaurios cret... more Introducción El territorio argentino ha brindado un amplio y diverso registro de dinosaurios cretácicos, aunque sesgado regionalmente, ya que la mayoría proviene de la Patagonia y unos pocos taxones del noroeste argentino. En el presente trabajo se dan a conocer restos de dinosaurios hallados en la Formación Puerto Yeruá, en dos localidades cercanas a la ciudad de Colón (provincia de Entre Ríos, Argentina), los cuales enri-quecen el conocimiento de las faunas de vertebrados extra-patagónicas del Cretácico. Los restos fósiles fueron hallados entre el material de canteras de canto rodado extraído por máquinas removedoras en Ita-i-cora y el arroyo Mármol, en la provincia de Entre Ríos (figura 1). Parte del material removido corresponde a conglomerados retrabaja-dos, bien estratificados en la parte más profunda de la cantera, transportados por el río Uruguay y rede-positados durante el Pleistoceno en inmediaciones de la ciudad de Colón. La Formación Puerto Yeruá (De Alba y Serra, 1959) ...
Revista del Museo Argentino de Ciencias Naturales, Nueva Serie
Abstract,: The first radiometric age for the Ncuqu6ii Croup, based on fission-track analysis made... more Abstract,: The first radiometric age for the Ncuqu6ii Croup, based on fission-track analysis made on ail ashflow tuff at the base or Lhe IIuincul Fomacion. is reoorted iil this moor. The radiome!ric am offers a more age of88 i; 3.9 My This value suggost Lhat he i!nincul Forination was deposited botwerii ail ago range ii.orri 84.1 to 91.9 My, chat is froin the biise .if the Turonian to the top of tho Sanlonian.
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Books by Sebastián Apesteguía
Este trabajo relaciona las faunas de dinosaurios del Triángulo Minero, en el centro-sur de Brasil, los de la Cuenca Norte en el oeste de Uruguay y los de la Cuenca Neuquina, en la Patagonia argentina. La comparación bioestratigráfica y biocronológica, teniendo en cuenta no solo los taxones presentes sino también aquellos ausentes que son frecuentes en otras cuencas permiten discutir las relaciones de edad y de distribución entre las tres cuencas. Se discute la asignación de dientes aislados post-Coniacianos a Carcharodontosauridae así como los supuestos espinosaurios de Argentina. Otros materiales son evaluados, como aquellos de Entre Ríos, parte argentina de la Cuenca Norte de Uruguay, así como materiales de deinonicosaurios, neovenatóridos, anquilosaurios, hadrosáuridos y saurópodos, particularmente del género Aeolosaurus. Se incluyen los materiales de huevos.
Papers by Sebastián Apesteguía
Journal of Herpetology, we present both review and original studies on the evolution of lepidosaurs from Gondwana. In this contribution, we provide a brief introduction to those studies and also present metadata collected from the Web of Science on the progress of the study of lepidosaurian evolution. The latter indicate a substantial increase of research interest in multiple aspects of lepidosaur evolution worldwide, with special increase for lepidosaurs from Gondwanan continents. We conclude by setting some of the main goals we hope to achieve in the study of lepidosaurs from Gondwana in the near future.
Este trabajo relaciona las faunas de dinosaurios del Triángulo Minero, en el centro-sur de Brasil, los de la Cuenca Norte en el oeste de Uruguay y los de la Cuenca Neuquina, en la Patagonia argentina. La comparación bioestratigráfica y biocronológica, teniendo en cuenta no solo los taxones presentes sino también aquellos ausentes que son frecuentes en otras cuencas permiten discutir las relaciones de edad y de distribución entre las tres cuencas. Se discute la asignación de dientes aislados post-Coniacianos a Carcharodontosauridae así como los supuestos espinosaurios de Argentina. Otros materiales son evaluados, como aquellos de Entre Ríos, parte argentina de la Cuenca Norte de Uruguay, así como materiales de deinonicosaurios, neovenatóridos, anquilosaurios, hadrosáuridos y saurópodos, particularmente del género Aeolosaurus. Se incluyen los materiales de huevos.
Journal of Herpetology, we present both review and original studies on the evolution of lepidosaurs from Gondwana. In this contribution, we provide a brief introduction to those studies and also present metadata collected from the Web of Science on the progress of the study of lepidosaurian evolution. The latter indicate a substantial increase of research interest in multiple aspects of lepidosaur evolution worldwide, with special increase for lepidosaurs from Gondwanan continents. We conclude by setting some of the main goals we hope to achieve in the study of lepidosaurs from Gondwana in the near future.