Consulta: creatorFacets:"Azevedo,Sergio A.K."
Registros recuperados: 4
Data/hora: 09/06/2024 13:39:38

Recovering missing data: estimating position and size of caudal vertebrae in Staurikosaurus pricei Colbert, 1970
Provedor de dados: 42
Autores: Grillo,Orlando N.; Azevedo,Sergio A.K.
Missing data is a common problem in paleontology. It makes it difficult to reconstruct extinct taxa accurately and restrains the inclusion of some taxa on comparative and biomechanical studies. Particularly, estimating the position of vertebrae on incomplete series is often non-empirical and does not allow precise estimation of missing parts. In this work we present a method for calculating the position of preserved middle sequences of caudal vertebrae in the saurischian dinosaur Staurikosaurus pricei, based on the length and height of preserved anterior and posterior caudal vertebral centra. Regression equations were used to estimate these dimensions for middle vertebrae and, consequently, to assess the position of the preserved middle sequences. It also...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Missing data; Caudal vertebra; Regression; Staurikosaurus pricei.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100004

Pelvic and hind limb musculature of Staurikosaurus pricei (Dinosauria: Saurischia)
Provedor de dados: 42
Autores: Grillo,Orlando N.; Azevedo,Sergio A.K.
The study of pelvic and hind limb bones and muscles in basal dinosaurs is important for understanding the early evolution of bipedal locomotion in the group. The use of data from both extant and extinct taxa placed into a phylogenetic context allowed to make well-supported inferences concerning most of the hind limb musculature of the basal saurischian Staurikosaurus pricei Colbert, 1970 (Santa Maria Formation, Late Triassic of Rio Grande do Sul, Brazil). Two large concavities in the lateral surface of the ilium represent the origin of the muscles iliotrochantericus caudalis plus iliofemoralis externus (in the anterior concavity) and iliofibularis (in the posterior concavity). Muscle ambiens has only one head and originates from the pubic tubercle. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Extant phylogenetic bracket; Locomotion; Muscular reconstruction; Saurischia; Staurikosaurus pricei.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100005

On a new peirosaurid crocodyliform from the Upper Cretaceous, Bauru Group, southeastern Brazil
Provedor de dados: 42
Autores: 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

A new dinosaur (Theropoda, Spinosauridae) from the Cretaceous (Cenomanian) Alcântara Formation, Cajual Island, Brazil
Provedor de dados: 42
Autores: 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