极端的子延长在奇怪的三叠纪爬行动物中尽管存在强烈的发育约束,但却进化了 - - 这意味着子模块化在类动物中具有重要意义
Adam Rytel1,2, Christine Böhmer3, Stephan N F Spiekman4
1Institute of Paleobiology, Polish Academy of Sciences, , Warsaw 00818, Poland.
Royal Society open science
|July 30, 2024
概括
称为Tanystropheidae的三叠纪爬行动物通过延长椎和移动区域而进化了极长的子,而不是通过增加更多的椎. 这种独特的部进化为脊椎动物的发展和模块化提供了洞察力.
科学领域:
- 古生物学的古生物学
- 脊椎动物解剖学 脊椎动物解剖学
- 进化生物学 进化生物学
背景情况:
- 三亚纪时期见证了多样化的脊椎动物进化,包括灭绝的爬行动物的独特解剖特征.
- 塔尼斯特罗菲类 (archosauromorph爬行动物) 以极端的椎脊椎延伸而闻名,在脊椎动物中是无与伦比的.
- 塔尼斯特罗菲德子的演变和功能仍然不太清楚.
研究的目的:
- 为了研究早期古类动物子延长的进化历史.
- 了解Tanystropheidae极端子长度背后的发育机制.
- 分析早期阿尔科索罗形态动物的椎脊柱的模块化.
主要方法:
- 几何形态测量被用来分析椎椎的物种内变异.
- 该研究的重点是早期的古类动物,以追踪子延长的进化轨迹.
- 脊柱模块性通过比较早期的古类动物与现存动物来评估.
主要成果:
- 这些爬行动物的宫系列表现出类似于现存的脊椎动物的模块化.
- 坦尼斯特罗菲德通过索米特延长和区域转移 (宫/胸部) 实现了子延长.
- 子延长发生在没有增加骨前脊椎数量的情况下,不同于冠状类.
结论:
- 坦尼斯特罗菲德的子延长是由特定的发育约束驱动的,与其他类动物不同.
- 早期的长类动物的脊柱模块化为比较研究提供了基础.
- 这项研究对于理解三叠纪爬行动物,现存物种和其他灭绝的动物的脊柱演变至关重要.
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