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A new Cretaceous terrestrial ecosystem from Gondwana with the description of a new sauropod dinosaur Anais da ABC (AABC)
Calvo,Jorge O.; Porfiri,Juan D.; González-Riga,Bernardo J.; Kellner,Alexander W.A..
A unique site at the northern area of Patagonia (Neuquén, Argentina) reveals a terrestrial ecosystem preserved in a detail never reported before in a Late Cretaceous deposit. An extraordinary diversity and abundance of fossils was found concentrated in a 0.5 m horizon in the same quarry, including a new titanosaur sauropod, Futalognkosaurus dukei n.gen., n.sp, which is the most complete giant dinosaur known so far. Several plant leaves, showing a predominance of angiosperms over gymnosperms that likely constituted the diet of F. dukei were found too. Other dinosaurs (sauropods, theropods, ornithopods), crocodylomorphs, pterosaurs, and fishes were also discovered, allowing a partial reconstruction of this Gondwanan continental ecosystem.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dinosauria; Titanosauria; Ecosystem; Taphonomy; Upper Cretaceous; Gondwana; Patagonia; Argentina.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000300013
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A new dinosaur (Theropoda, Spinosauridae) from the Cretaceous (Cenomanian) Alcântara Formation, Cajual Island, Brazil Anais da ABC (AABC)
Kellner,Alexander WA.; Azevedo,Sergio A.K.; Machado,Elaine B.; Carvalho,Luciana B. de; Henriques,Deise D.R..
A new spinosaurid taxon, Oxalaia quilombensis gen. et sp. nov., is described based on the anterior part of a snout and a fragment of a maxilla. These specimens were collected at the Laje do Coringa site, Late Cretaceous (Cenomanian) of the São Luis Basin. Unlike Cristatusaurus and Suchomimus, Oxalaia quilombensis lacks serrations on the teeth. The new species differs from Angaturama limai by having the anterior part of the premaxillae more expanded and by lacking a sagittal premaxillary crest. It further differs from Spinosaurus cf. S. aegyptiacus and the Algerian spinosaurid by the rounder shape of the terminal expansion. Furthermore, xalaia quilobensis has one functional tooth followed by two replacement teeth, a feature not previously observed in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dinosauria; Spinosauridae; Oxalaia quilombensis; Cenomanian; Brazil.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100006
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A new titanosaur sauropod from the Atacama Desert, Chile Anais da ABC (AABC)
Kellner,Alexander W.A.; Rubilar-Rogers,David; Vargas,Alexander; Suárez,Mario.
Partial remains of a titanosaur sauropod collected in the Tolar Formation (Upper Cretaceous) at the Atacama Desert (Antofagasta Region), northern Chile, is described, and a new species, Atacamatitan chilensis gen. et sp. nov., is erected. The material consists mainly of dorsal and caudal vertebrae, part of a humerus and a femur. The presence of a titanosaur confirms the Cretaceous age for the outcrops of red sandstone of the Tolar Formation whose age was previously uncertain, ranging from the Upper Cretaceous to the Paleocene. The new specimen represents the most complete dinosaur reported for this region and one of the most complete titanosaur known from Chile and the pacific margin of South America so far.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dinosauria; Titanosauria; Atacamatitan; Atacama Desert; Cretaceous.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100011
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Are the dinosauromorph femora from the Upper Triassic of Hayden Quarry (New Mexico) three stages in a growth series of a single taxon? Anais da ABC (AABC)
MÜLLER,RODRIGO T..
ABSTRACT The lagerpetid Dromomeron romeri and the theropod Tawa hallae are two dinosauromorphs from the Norian (Upper Triassic) of the Chinle Formation, situated in New Mexico, USA. However, a recent study suggests the inclusion of the holotype of D. romeri (GR 218) and paratype (GR 155) and referred (GR 235) specimens of T. hallae in an ontogenetic series of a single species. The specimens GR 218 and GR 155 include just an isolated femur, while GR235 includes femora, pelvis and tail. The inclusion of the specimens in an unique ontogenetic series relies on the putative immature condition and plastic deformation of the specimen GR 218. However, as observed here, the disparity between the femora of D. romeri and T. hallae is considerably higher than those...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chinle Formation; Dinosauria; Dinosauriformes; Lagerpetidae; Norian; Ontogeny.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300835
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Baalsaurus mansillai gen. et sp. nov. a new titanosaurian sauropod (Late Cretaceous) from Neuquén, Patagonia, Argentina Anais da ABC (AABC)
CALVO,JORGE O.; RIGA,BERNARDO GONZALEZ.
Abstract We describe a dentary of a new titanosaur sauropod, Baalsaurus mansillai, gen. et sp. nov. from the Late Cretaceous of Patagonia, Argentina. The material comes from the Portezuelo Formation, Neuquén Group. Titanosaur sauropods lower jaws are scarce and only nine taxa with dentaries have been described. There are two types of morphology in titanosaur dentaries; “L” shaped or “U” shaped based on the shape, without a phylogenetic issue. In this paper; we recognize a new taxa, Baalsaurus mansillai, represented by an “L” shaped dentary with three apomorphic characters that are not present in other taxa: dentary alveoli with 10 teeth in the anterior ramus, a ventrally and anteriorly inclined symphysis and a wide ventral Meckelian groove surrounded by a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Argentina; Dinosauria; Neuquén; Sauropoda; Upper Cretaceous.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400506
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Brief review of dinosaur studies and perspectives in Brazil Anais da ABC (AABC)
KELLNER,ALEXANDER W. A.; CAMPOS,DIOGENES A..
Dinosaur research is developing at very high rates around the world resulting in several new discoveries that are improving our understanding of this terrestrial reptilian clade. Except for the last couple years, the studies of Brazilian dinosaurs have not followed this expansive trend, despite the high potential of several dinosaur localities. So far there are only eight described taxa, four in the last year, representing theropod, sauropod, and one possible prosauropod taxa. Except for footprints, there are no records of ornithischian dinosaurs in the country what is at least partially explainable by the lack of continuous vertebrate fossil collecting program in the country. More funding is necessary to improve the research activities in this field.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Paleontology; Dinosauria; Brazil.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400005
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Mesozoic dinosaurs from Brazil and their biogeographic implications Anais da ABC (AABC)
Bittencourt,Jonathas S.; Langer,Max C..
The record of dinosaur body-fossils in the Brazilian Mesozoic is restricted to the Triassic of Rio Grande do Sul and Cretaceous of various parts of the country. This includes 21 named species, two of which were regarded as nomina dubia, and 19 consensually assigned to Dinosauria. Additional eight supraspecific taxa have been identified based on fragmentary specimens and numerous dinosaur footprints known in Brazil. In fact, most Brazilian specimens related to dinosaurs are composed of isolated teeth and vertebrae. Despite the increase of fieldwork during the last decade, there are still no dinosaur body-fossils of Jurassic age and the evidence of ornithischians in Brazil is very limited. Dinosaur faunas from this country are generally correlated with those...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brazil; Dinosauria; Triassic; Jurassic; Cretaceous; Paleobiogeography.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100003
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Notes on the axial skeleton of the titanosaur Bonitasaura salgadoi (Dinosauria-Sauropoda) Anais da ABC (AABC)
Gallina,Pablo A..
Sauropod axial anatomy is particularly important in understanding morphological features and phylogenetic analyses. Spatial arrangement of zygapophyses and rib articulations, as well as their complex laminar development, help to recognize the relative position of isolated vertebral elements. The presence of anterior, mid and posterior elements along the cervical, dorsal and caudal series in Bonitasaura salgadoi allows the analysis of several anatomical characteristics. These include the pattern of neurocentral closure with unfused, partially fused and completely fused elements in a peculiar temporal sequence, as well as several neural spine modifications and the laminar arrangement. The variations in neural spine morphology include a lateral expansion of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dinosauria; Neural spine; Neurocentral closure; Sauropoda; Titanosauria; Vertebral laminae.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100013
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Nuevos restos fósiles de Mendozasaurus neguyelap (Sauropoda, Titanosauria) del Cretácico Tardío de Mendoza, Argentina Ameghiniana
González Riga,Bernardo J..
En América del Sur la mayoría de las especies de titanosaurios están representadas por restos esqueletales incompletos que no tienen preservadas sus vértebras cervicales. En este contexto, el hallazgo de restos cervicales de Mendozasaurus neguyelap González Riga es relevante desde el punto de vista sistemático. Los restos provienen del mismo sitio paleontológico y asociación fósil del holotipo, Subgrupo Río Neuquén, Turoniano tardío - Coniaciano tardío de la provincia de Mendoza, Argentina. Las vértebras cervicales de Mendozasaurus exhiben caracteres novedosos con respecto a las de otros titanosaurios, si bien comparten con Isisaurus colberti (Jain y Bandyopadhyay) del Maastrichthiano de la India la presencia de: 1) centros vertebrales relativamente cortos...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dinosauria; Titanosauria; Vértebras cervicales; Cretácico Tardío; Mendoza; Argentina.
Ano: 2005 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142005000300002
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Osteología embrionaria de saurópodos titanosaurios de Neuquén (Argentina): aspectos ontogenéticos y evolutivos Ameghiniana
García,Rodolfo A; Salgado,Leonardo; Coria,Rodolfo A; Chiappe,Luis M.
Se describen restos embrionarios de dinosaurios saurópodos hallados en huevos Megaloolithidae recolectados de la Formación Anacleto (Cretácico Superior), en la localidad de Auca Mahuevo, en la provincia de Neuquén, Argentina. Estos materiales incluyen cráneos completos articulados y desarticulados, así como numerosos elementos aislados craneanos y postcraneanos. El cráneo embrionario es corto y alto, y presenta una serie de fenestras, la mayoría de las cuales está también en el cráneo de los titanosaurios adultos. Sin embargo, el yugal y el maxilar son muy diferentes con respecto a la morfología exhibida en los especímenes adultos. Estos elementos presentan una serie de procesos que radian de su cuerpo central, los cuales parecen modificarse durante la...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dinosauria; Titanosauria; Embriones; Desarrollo ontogenético; Cretácico Superior; Formación Anacleto; Auca Mahuevo; Argentina.
Ano: 2010 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142010000400001
Registros recuperados: 10
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