Garcia Maurício S, Pretto Flávio A, Dias-DA-Silva Sérgio, Müller Rodrigo T
Curso de Ciências Biológicas, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Av. Roraima, 1000, Bairro Camobi, 97105-900 Santa Maria, RS, Brazil.
Centro de Apoio à Pesquisa Paleontológica da Quarta Colônia, Universidade Federal de Santa Maria, Rua Maximiliano Vizzotto, 598, 97230-000 São João do Polêsine, RS, Brazil.
An Acad Bras Cienc. 2019 Aug 8;91(suppl 2):e20180614. doi: 10.1590/0001-3765201920180614.
Discoveries in Carnian-aged rocks are establishing a rich and diverse dinosaurian fauna at the so-called 'dawn of the age of dinosaurs' in the Late Triassic of Western Gondwana. Accordingly, Brazilian strata from the Candelária Sequence have contributed extensively to this trend. Here, we present a new dinosaurian specimen (CAPPA/UFSM 0200) from this geological unit. The material was collected at a fossiliferous site that had no previous record of dinosaurs. Our specimen comprises a single ilium, which we describe in detail. Its anatomy is consistent with Carnian sauropodomorph dinosaurs, but differs from coeval specimens by several features, although we do not discard the possibility of these features being the result of intraspecific variation. In part of our phylogenetic investigation, CAPPA/UFSM 0200 was recovered within Saturnaliinae, a group comprised of Carnian sauropodomorphs from South America. However, based on examination of better-sampled coeval taxa, a character (a strong rugosity in the ilium) supporting this less inclusive position might be related to intraspecific variation and so, should be carefully considered. This study increases the distribution of dinosaur remains in fossiliferous units from southern Brazil and adds to the discussion regarding intraspecific variation and its implications in the phylogeny of early dinosaurs.
在冈瓦纳大陆西部晚三叠世所谓的“恐龙时代黎明”时期的卡尼阶岩石中的发现，正在确立一个丰富多样的恐龙动物群。因此，来自坎德拉里亚层序的巴西地层对这一趋势做出了广泛贡献。在此，我们展示了来自这个地质单元的一个新的恐龙标本（CAPPA/UFSM 0200）。该标本是在一个以前没有恐龙记录的化石产地采集的。我们的标本包括一块单一的髂骨，我们对其进行了详细描述。其解剖结构与卡尼阶蜥脚形亚目恐龙一致，但在几个特征上与同时期的标本不同，尽管我们不排除这些特征是种内变异结果的可能性。在我们系统发育研究的一部分中，CAPPA/UFSM 0200被归入沙图纳利亚科，该科由来自南美洲的卡尼阶蜥脚形亚目恐龙组成。然而，基于对采样更好的同时期分类群的研究，支持这一范围较窄分类位置的一个特征（髂骨上的强烈皱纹）可能与种内变异有关，因此应谨慎考虑。这项研究增加了巴西南部含化石单元中恐龙遗骸的分布范围，并为关于种内变异及其在早期恐龙系统发育中的影响的讨论增添了内容。
