巴西上三叠世两种早期蜥脚形目恐龙股骨成体序列中前外侧瘢痕的存在和形状

IF 1.3 4区 地球科学 Q3 PALEONTOLOGY
R. Müller
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引用次数: 4

摘要

摘要前外侧瘢痕是某些上龙股骨头前外侧面上隆起且通常呈圆形的骨化,位于“大转子”前方和股骨头后方。这种结构在早期恐龙中的存在和形状仍知之甚少。在本研究中,巴西上三叠纪的两种早期蜥脚类恐龙Pampadromaeus barbrenai和Buriolestes schultzi保留了前外侧瘢痕的形状和变化。这些蜥脚类恐龙形态特别重要,因为它们作为分支的基础成员处于系统发育位置,而且它们与最古老的恐龙同时代。经过分析,标本在整个股骨系列中显示出与前外侧瘢痕相关的不同表面形态。每个物种的小标本(假定为幼年个体)都没有任何前外侧疤痕的迹象。另一方面,这种结构在较大的标本(假定为成年个体)中发育良好。因此,早期恐龙股骨上前外侧疤痕的缺失/存在受到个体发育的影响,正如在沉默龙类中观察到的那样。前外侧瘢痕的存在似乎比以前认为的更广泛地分布在鸟粪中。此外,马足类蜥脚类恐龙形态中没有凸起的前外侧疤痕似乎是一种新时期的特征,因为假定未成熟的早期蜥脚类个体也没有这种疤痕,而成年后会形成显著的疤痕。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
On the Presence and Shape of Anterolateral Scars in the Ontogenetic Series of Femora for Two Early Sauropodomorph Dinosaurs from the Upper Triassic of Brazil
Abstract. The anterolateral scar is a raised and generally rounded ossification on the anterolateral face of the femoral head of certain archosaurs, located anterior to the ‘greater trochanter’ and posterior to the femoral head. The presence and shape of this structure in early dinosaurs is still poorly understood. In the present study, the shape and variation of the anterolateral scar is preserved in two early sauropodomorph dinosaurs Pampadromaeus barberenai and Buriolestes schultzi from the Upper Triassic of Brazil. These sauropodomorphs are particularly significant because of their phylogenetic position as basal members of the clade and because they were coeval with the oldest of dinosaurs. Upon analysis, the specimens revealed distinct surface morphologies related to the anterolateral scar throughout their femoral series. Small specimens (putative juvenile individuals) of each species lack any sign of an anterolateral scar. On the other hand, the structure is well-developed in larger specimens (putatively adult individuals). Thus, an absence/presence of the anterolateral scar on the femora of early dinosaurs is affected by ontogeny, as observed in silesaurids. The presence of the anterolateral scar seems more widely distributed in ornithodirans than previously thought. Further, the absence of a raised anterolateral scar in massopodan sauropodomorphs appears to be a neotenic trait, since putatively immature early sauropodomorph individuals share this absence, while full adults develop a remarkable scar.
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来源期刊
Paleontological Research
Paleontological Research PALEONTOLOGY-
CiteScore
1.60
自引率
0.00%
发文量
47
审稿时长
>12 weeks
期刊介绍: Paleonotological Research (PR) is a quarterly, peer-reviewed international journal, which focuses on original contributions primarily in the area of paleontology but also covering a wide range of allied sciences. It has been published since 1997 as a successor to the former journal Transactions and Proceedings of the Palaeontological Society of Japan. The emphasis of contributions will include global and local perspectives, and contents can cover all ages (Precambrian to the Quaternary, including the present time).
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