Intestinal preservation in a birdlike dinosaur supports conservatism in digestive canal evolution among theropods.

Intestinal preservation in a birdlike dinosaur supports conservatism in digestive canal evolution among theropods.
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鸟类恐龙的肠道保存支持兽脚类恐龙消化道进化的保守性

DOI:
10.1038/s41598-022-24602-x
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发表时间:
2022-11-19
期刊:
影响因子:
4.6
通讯作者:
Liu, Yichuan
Liu, Yichuan
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Wang, Xuri;Cau, Andrea;Guo, Bin;Ma, Feimin;Qing, Gele;Liu, Yichuan

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恐龙是一种形似鸟类的恐龙,具有捕食鱼类、哺乳动物和其他恐龙的捕食生态。我们描述了Daurlong Wangi Gen.ET sp.11月,产于内蒙古下白垩统热河生物群的一种蜻蜓,中国。该标本的特殊保存包括腹部的一大片蓝色层,这是非鸟类恐龙中为数不多的肠道残留物之一。在系统发育上,Daurlong在热河短臂生物群物种谱系中筑巢,比小龙类更接近于真毛龙。更向干的棒爪龙中保存特别完好的肠道与更像鸟的Daurlong中的残留物之间的地形对应关系为推断其他缺乏内脏组织化石的兽足类动物的肠道范围提供了一个系统发育框架。胃肠组织的结果在食虫恐龙中是保守的,鸟类消化道的进化仅限于鸟兽脚类动物。
Dromaeosaurids were bird-like dinosaurs with a predatory ecology known to forage on fish, mammals and other dinosaurs. We describe Daurlong wangi gen. et sp. nov., a dromaeosaurid from the Lower Cretaceous Jehol Biota of Inner Mongolia, China. Exceptional preservation in this specimen includes a large bluish layer in the abdomen which represents one of the few occurrences of intestinal remnants among non-avian dinosaurs. Phylogenetically, Daurlong nests among a lineage of short-armed Jehol Biota species closer to eudromaeosaurs than microraptorines. The topographic correspondence between the exceptionally preserved intestine in the more stem-ward Scipionyx and the remnants in the more birdlike Daurlong provides a phylogenetic framework for inferring intestine tract extent in other theropods lacking fossilized visceral tissues. Gastrointestinal organization results conservative among faunivorous dinosaurs, with the evolution of a bird-like alimentary canal restricted to avialan theropods.
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