Ben Creisler
A new paper with free pdf:
Tiane Macedo De-Oliveira, Felipe Pinheiro & Leonardo Kerber (2020)
Sobreviventes: DiversificaÃÃo de Archosauromorpha apÃs a ExtinÃÃo Permo-TriÃssica.
[Survivors: diversification of Archosauromorpha after Permo-Triassic extinction]
Terrà Didatica 16: 1-23, Âe020009. (in Portuguese)
DOI:
https://doi.org/10.20396/td.v16i0.8656060https://periodicos.sbu.unicamp.br/ojs/index.php/td/article/view/8656060Free pdf:
https://periodicos.sbu.unicamp.br/ojs/index.php/td/article/view/8656060/22273The Archosauromorpha is defined as the clade that comprises all diapsids more closely related to the lineage of birds (Ornithodira or Avemetatarsalia) and crocodylians (Pseudosuchia or Crurotarsi) than to Lepidosauria. In addition to their 'basal' taxa (e.g., Tanystropheidae, Rhynchosauria, and Allokotosau-ria), Archosauromorpha includes the clade Archosauriformes, which, by its turn, includes Archosauria. During the Triassic, the archosauromorphs became the main group of diapsids to diversify in body size and Âmorphological Âdisparity. The ÂPermo-Triassic Âmass Âextinction Âoccurred Â252 Âmillion Âyears Âago Âand produced a dramatic change in the composition of the floral and faunal communities at the beginning of the Triassic period. The diversification of Archosauromorpha during the Triassic has been the focus of several recent studies, as this clade is a classic example of adaptive radiation. Here we synthesized relevant information on the morphology, paleobiology, and the effects of the end-Permian mass extinction in the group, an event directly linked to the beginning of the consolidation of modern faunas.
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Another item in the same issue but no pdf link or English abstract translation.
[Although the group sauropodomorph dinosaurs is widely known because of the giant sauropods, their origin is still poorly understood due to the scarcity of complete skeletons or precise dates. However, new findings and dating made in Triassic rocks in Brazil have brought to light valuable information regarding this issue. The combination of these new data with more advanced investigation techniques (e.g., computed tomography) has enabled the establishment of macroevolutionary patterns that guided the group's initial evolution. Through the discoveries made in the Triassic beds of Rio Grande do Sul, we can understand in a more refined way how sauropodomorphs went from small and relatively rare animals to the largest animals that ever walked on Earth.]
Embora o grupo dos dinossauros sauropodomorfos seja amplamente conhecido em virtude dos gigantescos saurÃpodes, sua origem ainda à pouco compreendida em virtude da escassez de esqueletos completos ou dataÃÃes precisas. Entretanto, novos achados e dataÃÃes realizadas em rochas TriÃssicas do Brasil tÃm trazido à tona informaÃÃes valiosas no que tange essa questÃo. A combinaÃÃo desses novos dados com tÃcnicas mais avanÃadas de investigaÃÃo (e.g. tomografias computadorizadas) vem possibilitando o estabelecimento dos padrÃes macroevolutivos que direcionaram a evoluÃÃo inicial do grupo. AtravÃs das descobertas realizadas nos leitos TriÃssicos do Rio Grande do Sul, podemos entender de forma mais refinada como foi que os sauropodomorfos passaram de animais pequenos e pouco abundantes aos maiores animais que jà andaram sobre a Terra.