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| Otero,Alejandro; Vizcaíno,Sergio F.. |
| We present the reconstruction of the hindlimb musculature of the titanosaur sauropod Neuquensaurus australis (Lydekker), integrating data from crocodilians and birds as a phylogenetic bracket. First, we evaluate sites of origin and insertions in N. australis by comparison with extant archosaurs as well as with previous works on dinosaur soft anatomy, and reconstruct principal muscles of the leg, such as Triceps femoris group, M. iliofibularis, Mm. adductores femores, Mm. gastrocnemii, M. ischiotrochantericus and Mm. caudofemorales. Second, we infer the probable function of each muscle comparing with our bracket taxa and with living analogs, principally mammals, because they are thought to be the best model to understand non-avian dinosaur locomotion. This... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Archosauria; Extant Phylogenetic Bracket; Soft tissue; Functional morphology. |
| Ano: 2008 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142008000200007 |
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| VEIGA,FÁBIO H.; BOTHA-BRINK,JENNIFER; RIBEIRO,ANA MARIA; FERIGOLO,JORGE; SOARES,MARINA B.. |
| Abstract: The non-dinosaurian dinosauriform silesaurids are the closest relatives of crown-group dinosaurs and are thus, important for understanding the origins of that group. Here, we describe the limb bone histology of the Late Triassic silesaurid Sacisaurus agudoensis from the Candelária Sequence of the Santa Maria Supersequence, Rio Grande do Sul state, Brazil. The sampled bones comprise eight femora and one fibula from different individuals. The microscopic analysis of all elements reveals uninterrupted fibrolamellar bone tissue indicating rapid growth. A transition to slower growing peripheral parallel-fibered bone tissue in some individuals indicates a decrease in growth rate, suggesting ontogenetic variation within the sample. The osteohistology of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Archosauria; Bone microstructure; Dinosauriform; Fibrolamellar bone; Growth rates. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400512 |
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| ROBERTO-DA-SILVA,LÚCIO; FRANÇA,MARCO A.G.; CABREIRA,SÉRGIO F.; MÜLLER,RODRIGO T.; DIAS-DA-SILVA,SÉRGIO. |
| ABSTRACT Many authors have discussed the subnarial foramen in Archosauriformes. Here presence among Archosauriformes, shape, and position of this structure is reported and its phylogenetic importance is investigated. Based on distribution and the phylogenetic tree, it probably arose independently in Erythrosuchus, Herrerasaurus, and Paracrocodylomorpha. In Paracrocodylomorpha the subnarial foramen is oval-shaped, placed in the middle height of the main body of the maxilla, and does not reach the height of ascending process. In basal loricatans from South America (Prestosuchus chiniquensis and Saurosuchus galilei) the subnarial foramen is 'drop-like' shaped, the subnarial foramen is located above the middle height of the main body of the maxilla, reaching... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Archosauria; Extra cranial opening; Santa Maria Formation; Brazil. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401309 |
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