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一个西卢里亚海上的蜘蛛
Derek J Siveter1, Mark D Sutton, Derek E G Briggs
1Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3PS, UK. derek.siveter@earth.ox.ac.uk
Nature
|October 22, 2004
概括
一个新的Silurian化石海蜘蛛提供了关于pycnogonid (海蜘蛛) 起源的证据. 这种最古老的成年海蜘蛛化石支持它们在Chelicerata中的位置,为早期关节动物进化提供了洞察力.
科学领域:
- 古生物学的古生物学
- 海洋生物学 海洋生物学
- 进化生物学 进化生物学
背景情况:
- 海洋蜘蛛 (Pycnogonids) 是一种海洋关节动物,在全球分布有超过1,160种.
- 它们的微妙结构和缺乏生物矿物化的结果是稀疏而有争议的化石记录.
- 遗传学定位受到质疑,假设将它们置于Chelicerata中或作为所有其他欧类动物的姐妹.
研究的目的:
- 为了描述一个新的,特别保存的pycnogonid化石从Silurian Herefordshire Konservat-Lagerstatte.
- 确定已知最古老的成年海蜘蛛化石,可追溯到大约4.25亿年前.
- 利用这个化石来告知pycnogonids的遗传位置和进化历史.
主要方法:
- 挖掘和数字重建的三维化石保存为酸盐空洞内填充.
- 详细的形态分析新的pycnogonid标本,专注于关键特征,如第一个附属物.
- کلیڈسٹک تجزیہٕ چھ ارتھروپودا اندر نئۍ انواعک فایلوجنیٹک جایٔن ہنٛد تعین کرنہٕ خٲطرٕ کٲم کران۔
主要成果:
- 描述了一种新的pycnogonid物种,这是迄今为止发现的最古老和最完整的化石海蜘蛛.
- 这种化石表现出一个大型酸盐的第一个附属物,支持酸盐对pycnogonids的亲和力.
- 遗传学分析将新物种定位在pycnogonid王冠群的底部附近.
结论:
- 发现这只西卢里亚时代的鸟,表明这个群体起源于这个时期.
- 化石证据支持了pycnogonids在Chelicerata中嵌套的假设.
- 这一发现为了解海蜘蛛的早期进化和古生物学做出了重大贡献.
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