体和体的形态学和本体学在立体体形状的temnospondyls中
Florian Witzmann1, Nadia Fröbisch1,2
1Museum für Naturkunde Berlin, Leibniz Institute for Evolution and Biodiversity Science, Berlin, Germany.
PeerJ
|October 31, 2023
概括
这项研究揭示了个体年龄,而不是大小,在立体形两动物中决定了中足骨化. 观察到独特的手腕骨化模式,与鱼和大多数早期四足动物不同,表明更大的发育变异性.
科学领域:
- 古生物学和脊椎动物解剖学
- 两动物的骨发育情况
- 进化生物学 进化生物学
背景情况:
- 多样化的古世和中世两动物Temnospondyls具有记录良好的骨发育.
- 体和体 (mesopodium) 骨化晚,很少保存,使得它们的本体发生不明.
- 之前的研究对米松基介质层的骨化序列的洞察力有限.
研究的目的:
- 为了研究Permo/Carboniferous立体形体中mesopodium的本体生成和骨化序列.
- 为了填补有关天松鱼和鱼的发展的知识空白.
- 为了比较 mesopodial 骨化模式与其他早期四足动物和现存的两动物.
主要方法:
- 对Permo/Carboniferous立体形体的生长序列的分析,以追踪手指骨和骨的连续骨化.
- 检查与同一物种内的身体大小相关的中骨化程度.
- 对立体形动物,其他早期四足动物和现存的之间骨化模式的比较分析.
主要成果:
- 在立体形形态动物中,中形骨化程度与个体年龄相关,而不是身体大小.
- 立体形体表现出远端体的前轴发育,但在近端中体中表现出后轴主导.
- 立体形体表现出近接体和远距离体的独特的前轴发育,中心柱的远距离至近接体骨化,与体不同.
结论:
- 立体形体表现出独特的手骨化模式,仅在一些现存的中发现,表明发育性可塑性.
- 从proximolateral到mediodistal的一般对角形骨化模式在立体形半形动物中很常见,可能反映了生物力学压力.
- 在立体形态动物和可能其他早期四足动物中,中足体的发育显示出比大多数现存四足动物更大的变异性.
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