一个化了的奥尔多维克 leanchoiliid 关节动物
Luke A Parry1, Derek E G Briggs2, Ruixin Ran3
1Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK.
Current biology : CB
|October 30, 2024
概括
一个来自奥尔多维纪时期的新化石节肢动物,Lomankus edgecombei,揭示了独特的大附属物形态和感觉功能. 这一发现将Leanchoiliidae的已知范围扩展到dysaerobic环境中,这表明了一个沉积物养的利基.
科学领域:
- 古生物学的古生物学
- 进化生物学 进化生物学
- 节肢动物形态学 节肢动物形态学
背景情况:
- 巨 (短大附属节肢动物) 对于理解节肢动物进化,特别是头部和附属肢体的发育至关重要.
- 对Megacheira的解释各不相同,将它们作为Euarthropoda或Chelicerata中的一个类或等级.
- 科科 (Leanchoiliidae) 是一个多样化的坎布里亚家族,其特点是它们的大附属体上的感觉鞭毛.
研究的目的:
- 为了描述Leanchoiliidae家族的第一个坎布里亚之后的成员,Lomankus edgecombei gen. et sp. 在新的一年里.
- 为了阐明三维 (3D) 头部形态和尾功能的leanchoiliids.
- 为了研究这个奥尔多维纪节肢动物的古老环境和生态.
主要方法:
- 微型计算机断层扫描 (micro-CT) 扫描以揭示详细的形态.
- 与已知Leanchoiliidae的附属结构进行比较分析.
- 化石遗址的平流图和古环境背景.
主要成果:
- 来自高奥尔多维纪蜂三岩床的Lomankus边缘的描述.
- 详细的3D形态大附属物,头四肢,干部部分,和telson.
- 独特的大附属体结构表明一种感官,而不是猛禽的功能,鞭毛直接附着在体上.
- 有充分发达的表皮 - 实验室综合体的证据,支持附属体的外脑起源.
结论:
- 洛曼库斯 (Lomankus edgecombei) 代表了第一个坎布里亚后的瘦类动物,扩展了该家族的时间范围.
- 这项研究提供了无与伦比的3D细节,介绍了瘦小体头部形态.
- 洛曼库斯 (Lomankus edgecombei) 居住在奥尔多维纪的双氧气环境中,占据了一个沉积物养的利基.
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