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Is Oculudentavis a bird or even archosaur?
bioRxiv - Paleontology Pub Date : 2020-06-08 , DOI: 10.1101/2020.03.16.993949
Zhiheng Li , Wei Wang , Han Hu , Min Wang , Hongyu Yi , Jing Lu

Recent finding of a fossil − Oculudentavis khaungraae Xing et al. 2020 − entombed in a Late Cretaceous amber, was claimed to represent a humming bird-sized dinosaur1. Regardless of the intriguing evolutionary hypotheses about the bauplan of Mesozoic dinosaurs (including birds) posited therein, this enigmatic animal demonstrates various morphologies resembling lizards. If Oculudentavis was a bird, it challenges several fundamental morphological differences between Lepidosauria and Archosauria. Here we reanalyze the original computed tomography scan data of Oculudentavis. Morphological evidences demonstrated here highly contradict the avian or even archosaurian phylogenetic placement of Oculudentavis. In contrast, our analysis revealed multiple synapomorphies of the Squamata in this taxon, including pleurodont marginal teeth and an open infratemporal fenestra, which suggests a squamate rather than avian or dinosaurian affinity of Oculudentavis.

中文翻译:

Oculudentavis是鸟还是恐龙?

化石的最新发现-Oculudentavis khaungraae Xing等。2020年-埋葬在白垩纪晚期的琥珀中,据称代表着嗡嗡的鸟形恐龙1。不管关于其中存在的中生代恐龙(包括鸟类)包波兰的有趣进化论假设,这种神秘动物都表现出类似于蜥蜴的各种形态。如果说Oculudentavis是一只鸟,它会挑战鳞翅目和龙之间的几种基本形态学差异。在这里,我们重新分析Oculudentavis的原始计算机断层扫描数据。此处显示的形态学证据与禽甚至鸟类的系统发育定位高度矛盾。相比之下,我们的分析显示,在这一类群的鳞目多个共有衍征,包括侧生边际牙齿和开放的窗孔颞下,这表明一个鳞片,而不是鸟类或恐龙亲和力Oculudentavis
更新日期:2020-06-08
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