Alvarezsauridae的个体发生与小型化(恐龙目,兽脚亚目)

Q3 Agricultural and Biological Sciences Biological Communications Pub Date : 2023-06-27 DOI:10.21638/spbu03.2023.201
Alexander Averianov, P. Skutschas, A. Lopatin
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引用次数: 1

摘要

对已知的阿尔瓦雷斯龙类兽脚亚目恐龙标本的个体发育状况进行了修正。我们提供的组织学数据表明,来自蒙古上白垩纪Barungoyot组的Parvicursor remotus的全型不是以前认为的成年个体,而是不到一岁的幼崽。小型化只发生在晚白垩世的亚洲细小ursorinae,而晚白垩世南美非细小ursorine alvarezsaurids是大型动物。通过将骨化转移到更早的个体发生阶段,特别是通过关闭幼年动物的前骶椎骨上的神经中枢缝合线,发生了小型化。没有形态学上的证据支持阿尔瓦雷兹龙的食蜜行为,向食蜜生态位的转变也不能解释小型化的需要。
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Ontogeny and miniaturization of Alvarezsauridae (Dinosauria, Theropoda)
The ontogenetic status of the known specimens of alvarezsaurid theropod dinosaurs is revised. We present histological data that the holotype of Parvicursor remotus from the Upper Cretaceous Barungoyot Formation of Mongolia is not an adult individual, as previously thought, but a juvenile less than one year old. The miniaturization took place only in the Late Cretaceous Asiatic Parvicursorinae, whereas the Late Cretaceous South American non-parvicursorine alvarezsaurids were large animals. The miniaturization occurred by shifting ossification to earlier ontogenetic stages, in particular, by the closure of the neurocentral sutures on the presacral vertebrae of juvenile animals. There is no morphological support for the myrmecophagy in the alvarezsaurids and a shift to a myrmecophagous ecological niche does not explain the need for miniaturization.
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来源期刊
Biological Communications
Biological Communications Agricultural and Biological Sciences-Agricultural and Biological Sciences (all)
CiteScore
1.70
自引率
0.00%
发文量
21
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