The Osteoderms of Baurusuchid Crocodyliforms (Mesoeucrocodylia, Notosuchia)
The Osteoderms of Baurusuchid Crocodyliforms (Mesoeucrocodylia, Notosuchia)
复制标题
鳄鳄目 (Mesoeucrocodylia, Notosuchia) 的骨皮
DOI：
--
复制
发表时间：
2019
影响因子：
1.4
通讯作者：
F. Montefeltro
中科院分区：
文献类型：
--
作者：
F. Montefeltro
鲍鳄科（Baurusuchidae）是生活在南美洲晚白垩世的一个陆生鳄类分支。该分支的成员在其栖息地中占据了顶级捕食者的角色。在过去的十年里，有关鲍鲁鳄科的解剖学、系统学和进化的知识有了深刻的增长。虽然他们的颅骨和颅后解剖方面变得越来越清楚，真皮盔甲的配置仍然被忽视，很少有人知道这些元素的解剖分支。真皮骨骼的baurusuchids在这里详细描述的安排和形态，假设没有皮氏血清中的骨皮细胞进行重新评估，并试图在Crocodyliformes进行详细的比较。皮甲的描述，特别是背部，揭示了一个不可预见的变化之间的baurusuchid类群，包括自形特征，被添加到分类群的诊断。根据新的标本证实了皮氏鳄血清中没有骨皮，揭示了这一分类群是唯一一种已知完全没有皮甲的陆生鳄鱼。与各种各样的鳄鱼形类的比较显示，在鳄鱼形类中，在排列和形态方面，鲍鲁鳄类的背盾是独一无二的，只有少数的背鳄类接近分支中所见的条件。这项研究探讨了可能的生物力学的独特背盾的baurusuchids的影响，并提供有关可能的系统发育信号的信息，在未来的分析，notosuchian系统学进行测试。
ABSTRACT Baurusuchidae is a clade of terrestrial crocodyliforms that thrived during the Late Cretaceous in South America. The members of this clade occupied top-predator roles in their habitats. Knowledge about the anatomy, the systematics, and the evolution of baurusuchids has increased profoundly in the past decade. Although aspects of their cranial and postcranial anatomy are becoming clearer, the configuration of the dermal armor remains neglected and little is known about the anatomy of these elements in the clade. The dermal skeleton of baurusuchids is described here in detail in terms of arrangement and morphology, the supposed absence of osteoderms in Pissarrachampsa sera is reevaluated, and a detailed comparison across Crocodyliformes is attempted. The description of the dermal armor, in particular that of the dorsum, revealed an unforeseen variation among baurusuchid taxa, including autapomorphic traits that were added to the diagnosis of taxa. The absence of osteoderms is confirmed for Pissarrachampsa sera based on new specimens, revealing this taxon as the only terrestrial crocodyliform known to lack dermal armor altogether. Comparisons with a diverse range of crocodyliforms revealed that the dorsal shield of baurusuchids is unique among crocodyliforms in terms of arrangement and morphology, and only a few notosuchians approach the condition seen in the clade. This study explores possible biomechanical implications of the unique dorsal shield of baurusuchids and provides information about possible phylogenetic signals, to be tested in future analyses of notosuchian systematics.