The endocast of Euparkeria sheds light on the ancestral archosaur nervous system

The endocast of Euparkeria sheds light on the ancestral archosaur nervous system
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Euparkeria 的内铸揭示了祖先祖龙神经系统

DOI:
10.1111/pala.12630
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发表时间:
2022
期刊:
影响因子:
2.6
通讯作者:
Bhullar, Bhart‐Anjan S.
Bhullar, Bhart‐Anjan S.
中科院分区:
地球科学2区
文献类型:
--
作者:
Fabbri, Matteo;Bhullar, Bhart‐Anjan S.

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了解四足动物大脑的进化对于追溯现代分支生态形态多样化的历史至关重要。虽然以前的研究主要集中在神经系统的形态转变沿着鸟类的过渡,但对主龙形目和早期主龙的大脑解剖知之甚少。在这里,我们描述的endocast ofEuparkeria capensis,一个小的身体,陆地主龙类密切相关的主龙类,解决目前的不确定性周围的祖先条件的主龙类神经系统的目标。EuparkeriasS形,嗅球大,大脑半球扩大,小叶延长。我们认为,这个关键的分类群是一个积极的捕食者与显着的嗅觉敏锐度。总的来说,Euparkeria的内模类似于在植龙,鳄鱼和早期恐龙中观察到的内模,这意味着现代鳄鱼保留了一个主龙类的类形脑形态。
Understanding the evolution of the tetrapod brain is essential to trace the history of ecomorphological diversification of modern clades. While previous studies focused on the morphological transformation of the nervous system along the dinosaur–bird transition, little is known about the brain anatomy of archosauriformes and early archosaurs. Here, we describe the endocast ofEuparkeria capensis, a small bodied, terrestrial archosauriform closely related to Archosauria, with the goal of resolving the current uncertainties surrounding the ancestral condition of the archosaurian nervous system. The endocast ofEuparkeriais sigmoidal, with large olfactory bulbs, an expanded cerebral hemisphere and an elongated flocculus. We suggest that this pivotal taxon was an active predator with a remarkable olfactory acuity. Overall, the endocast ofEuparkeriaresembles the ones observed in phytosaurs, crocodilians and early dinosaurs, implying that modern crocodilians retain an archosaurian plesiomorphic brain morphology.
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