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Registros recuperados: 21
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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 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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A Special year for the AABC Anais da ABC (AABC)
Kellner,Alexander W.A.; Meneghini,Rogerio.
Tipo: Info:eu-repo/semantics/other
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000100001
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Alzheimer's disease, the potential use of a bacterium in rice production, and the paleochannels of the Marajó Island Anais da ABC (AABC)
Kellner,Alexander W.A..
Tipo: Info:eu-repo/semantics/other
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300001
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An unusual long-tailed pterosaur with elongated neck from western Liaoning of China Anais da ABC (AABC)
Wang,Xiaolin; Kellner,Alexander W.A.; Jiang,Shunxing; Meng,Xi.
A new long-tailed pterosaur, Wukongopterus lii gen. et sp. nov, is described based on an almost complete skeleton (IVPP V15113) representing an individual with an estimated wing span of 730 mm. The specimen was discovered in strata that possibly represent the Daohugou Bed (or Daohugou Formation) at Linglongta, Jianchang, Liaoning Province, China. Wukongopterus lii is a non-pterodactyloid pterosaur diagnosed by the first two pairs of premaxillary teeth protruding beyond the dentary, elongated cervical vertebrae (convergent with Pterodactyloidea), and a strongly curved second pedal phalanx of the fifth toe. The specimen further has a broken tibia that indicates an injury occurred while the individual was still alive. Taphonomic aspects provide indirect...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pterosauria; Wukongopterus; ?Late Jurassic-Early Cretaceous; Liaoning; China.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400016
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Comments on the Pteranodontidae (Pterosauria, Pterodactyloidea) with the description of two new species Anais da ABC (AABC)
Kellner,Alexander W.A..
Considered one of the best known flying reptiles, Pteranodon has been subject to several reviews in the last century. Found exclusively in the Upper Cretaceous Niobrara Formation and Pierre Shale Group 11 species have been attributed to this genus (excluding the ones presently regarded as representing Nyctosaurus). While reviewers agree that this number is inflated, there is disagreement on how many species can be identified. The last review recognized only two species (Pteranodon longiceps and Pteranodon sternbergi) both being sexually dimorphic. Based on several cranial features, some specimens previously referred to the genus Pteranodon are re-evaluated leading to the recognition of the following species, two of which new that are described here:...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pterosauria; Pteranodon; Dawndraco; Late Cretaceous; Taxonomy.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400025
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Comments on Triassic pterosaurs with discussion about ontogeny and description of new taxa Anais da ABC (AABC)
Kellner,Alexander W.A..
Eudimorphodon ranzii was the first Triassic pterosaur to be described and several specimens have been referred to this taxon mainly based on the presence of multicuspid teeth. Since this dental feature has been observed in several other pterosaurs, the revision of some specimens assigned to Eudimorphodon shows that they represent new taxa as follows: Arcticodactyluscromptonellus (comb. nov.), Austriadraco dallavecchiai (gen. et sp. nov.) and Bergamodactyluswildi (gen. et sp. nov.). A preliminary analysis of pterosaur ontogeny resulted in the recognition of six distinct ontogenetic stages (OS1-6). According to this classification, the holotype of Arcticodactyluscromptonellus has reached OS2, and although being ontogenetically much younger than others, the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pterosauria; Ontogeny; Eudimorphodon; Arcticodactylus; Austriadraco; Bergamodactylus.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200669
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Critical review of radiopharmaceutical-drug interactions, unexpected new age for a Tupiguarani settlement, and the h-index in the Brazilian Academy of Sciences Anais da ABC (AABC)
Kellner,Alexander W.A..
Tipo: Info:eu-repo/semantics/other
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000400001
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Ethnic ancestry and smoking, farming of wine grapes in semiarid regions, and the potentials of Manihot multifida in medicine use Anais da ABC (AABC)
Kellner,Alexander W.A..
Tipo: Info:eu-repo/semantics/other
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100001
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Global climate change and dengue Anais da ABC (AABC)
Kellner,Alexander W.A..
Tipo: Info:eu-repo/semantics/other
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200001
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H-index in the Brazilian Academy of Sciences: comments and concerns Anais da ABC (AABC)
Kellner,Alexander W.A.; Ponciano,Luiza C.M.O..
Bibliometric parameters have been used in order to evaluate a scientist's performance. The h-index has been gradually accepted as the most adequate parameter for this purpose. To have an idea of this index among Brazilian scientists, we performed an analysis of this parameter for the full members of the Brazilian Academy of Sciences (BAS). The h-index of 402 members listed in 10 distinct categories by the BAS was determined, cross-checked with the curriculum vitae of each of them listed at the Plataforma Lattes database (CVL) and compared with each other. Despite the large production, mostly in journals without impact factor, the h-indexes among the BAS members are comparatively low and show a large variation in all of the 10 categories, particularly in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Scientometrics; Bibliometric indexes; H-index; Brazilian Academy of Sciences.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000400016
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New approaches to the treatment of fear memories, the interaction of the plant Tropoaeolum majus and the meylerid Astylus variegatus, and a new flying reptile from the Cretaceous of China Anais da ABC (AABC)
Kellner,Alexander W.A..
Tipo: Info:eu-repo/semantics/other
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400001
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New long-tailed pterosaurs (Wukongopteridae) from western Liaoning, China Anais da ABC (AABC)
Wang,Xiaolin; Kellner,Alexander W.A.; Jiang,Shunxing; Cheng,Xin; Meng,Xi; Rodrigues,Taissa.
Two almost complete long-tailed pterosaurs from the Linglongta, Jianchang County, western Liaoning, China, are described and represent new taxa referred to the non-pterodactyloid clade Wukongopteridae. Kunpengopterus sinensis gen. et sp. nov. differs from other members of this clade mainly by the rounded posterior region of the skull, thick lacrimal process of the jugal and lack of a bony premaxillary crest. This species further shows a soft tissue crest above the frontal, a comparatively larger wing finger, and the proximal segment of the second pedal phalanx of the fifth toe shorter than in other wukongopterids. The second new species is referred to the genus Darwinopterus, D. linglongtaensis sp. nov. based on the posterior region of the skull. It...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pterosauria; Wukongopteridae; Kunpengopterus; Darwinopterus; Liaoning; China.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400024
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Niche overlap analysis of a lizard assemblage from the Atlantic Rainforest, evaluation of arsenic toxicity in cladocerans, and molecular biology of mycoplasmas Anais da ABC (AABC)
Kellner,Alexander W.A..
Tipo: Info:eu-repo/semantics/other
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200437
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On a new peirosaurid crocodyliform from the Upper Cretaceous, Bauru Group, southeastern Brazil Anais da ABC (AABC)
Campos,Diogenes A.; Oliveira,Gustavo R.; Figueiredo,Rodrigo G.; Riff,Douglas; Azevedo,Sergio A.K.; Carvalho,Luciana B.; Kellner,Alexander W.A..
A new crocodyliform from the Upper Cretaceous (Campanian-Maastrichtian) Presidente Prudente Formation of the Bauru Group is described based on two almost complete skulls and mandibles. The material comes from the "Tartaruguito" site, situated at an old railroad between the cities of Pirapozinho and Presidente Prudente, state of São Paulo, Brazil. The new species, Pepesuchus deiseae gen. et sp. nov., is classified in the clade Peirosauridae on the basis of three synapomorphies: the presence of five premaxillary teeth, the anterior two premaxillary alveoli nearly confluent, and the oval cross-section of the jugal along the lower temporal bar. The new taxon increases the outstanding crocodyliform diversity of the Bauru Group, particularly of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pepesuchus; Peirosauridae; Cretaceous; Bauru Group; Brazil.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100020
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On the pterosaur remains from the Río Belgrano formation (Barremian), Patagonian Andes of Argentina Anais da ABC (AABC)
Kellner,Alexander W.A.; Aguirre-Urreta,María B.; Ramos,Victor A..
Pterosaur remains from the Río Belgrano Formation, Santa Cruz Province, Argentina, were found close to the Estancia Río Roble, along with several ammonoids that indicate a Barremian age for those strata. The specimens (MACN-SC 3617) consist of one ulna and one element tentatively identified as a portion of a wing metacarpal. The ulna shows morphological affinities with the Pteranodontoidea (sensu Kellner 1996), particularly with the members of the Anhangueridae by having a well developed ventral crest close to the proximal articulation, and is tentatively referred to this pterosaur clade. The oldest record of the Anhangueridae, previously limited to the Aptian/Albian, is therefore extended to the Barremian. The Argentinean material is preserved in three...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pterosauria; Río Belgrano Formation; Lower Cretaceous; Argentina.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000400007
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On two pterosaur humeri from the Tendaguru beds (Upper Jurassic, Tanzania) Anais da ABC (AABC)
Costa,Fabiana R.; Kellner,Alexander W.A..
Jurassic African pterosaur remains are exceptionally rare and only known from the Tendaguru deposits, Upper Jurassic, Tanzania. Here we describe two right humeri of Tendaguru pterosaurs from the Humboldt University of Berlin: specimens MB.R. 2828 (cast MN 6661-V) and MB.R. 2833 (cast MN 6666-V). MB.R. 2828 consists of a three-dimensionally preserved proximal portion. The combination of the morphological features of the deltopectoral crest not observed in other pterosaurs suggests that this specimen belongs to a new dsungaripteroid taxon. MB.R. 2833 is nearly complete, and because of a long and round proximally placed deltopectoral crest it could be referred to the Archaeopterodactyloidea. It is the smallest pterosaur from Africa and one of the smallest...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tendaguru; Tanzania; Africa; Upper Jurassic; Pterosauria.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400017
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Proceedings of the Third Gondwanan Dinosaur Symposium Anais da ABC (AABC)
Kellner,Alexander W.A.; Tomida,Yukimitsu.
Tipo: Info:eu-repo/semantics/other
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100001
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Short note on a Pteranodontoid pterosaur (Pterodactyloidea) from western Queensland, Australia Anais da ABC (AABC)
Kellner,Alexander W.A.; Rodrigues,Taissa; Costa,Fabiana R..
Flying reptiles from Australia are very rare, represented mostly by isolated bones coming from the Early Cretaceous (Albian) Toolebuc Formation, which crops out in western Queensland. Among the first pterosaur specimens discovered from this deposit is a mandibular symphysis that some authors thought to have a particular affinity to species found in the Cambridge Greensand (Cenomanian) of England. It was further referred as a member of or closely related to one of the genera Ornithocheirus, Lonchodectes or Anhanguera. Here we redescribe this specimen, showing that it cannot be referred to the aforementioned genera, but represents a new species of Pteranodontoid (sensu Kellner 2003), here named Aussiedraco molnari gen. et sp. nov. It is the second named...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pteranodontoidea; Pterosauria; Toolebuc Formation; Cretaceous; Australia.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100018
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The anatomy of some orchid roots, the characterization of tomato mutants and the perception of evolution among graduate students Anais da ABC (AABC)
Kellner,Alexander W.A..
Tipo: Info:eu-repo/semantics/other
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200001
Registros recuperados: 21
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