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High-fidelity X-ray micro-tomography reconstruction of siderite-hosted Carboniferous arachnids

机译:菱铁矿石化蜘蛛蛛的高保真X射线断层扫描重建

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摘要

A new approach to maximize data recovery from siderite-hosted fossils is presented. Late Carboniferous trigonotarbids (Arachnida: Trigonotarbida) from Coseley, UK, were chosen to assess the potential of high-resolution X-ray micro-tomography (XMT). Three-dimensional computer reconstruction visualizes the animals at 20 µm or better resolution, resolving subtle and previously unseen details. Novel data recovered includes (possibly plesiomorphic) retention of endites on leg coxae of Cryptomartus hindi (Anthracomartidae) and highlights further similarities between this family and the Devonian Palaeocharinidae. Also revealed is a flattened body with robust anterior limbs, implying a hunting stance similar to modern crab spiders (Thomisidae). Eophrynus prestvicii (Eophrynidae) had more gracile limbs but a heavily ornamented body, with newly identified upward-pointing marginal spines on the opisthosoma. Its habitus is comparable with certain modern laniatorid harvestmen (Opiliones). These findings demonstrate the potential of XMT to revolutionize the study of siderite-hosted Coal Measures fossils.
机译:提出了一种最大化从菱铁矿化石中恢复数据的新方法。选择了来自英国科斯利的晚期石炭纪的三角恐龙(蛛网纲:Trigonotarbida)来评估高分辨率X射线显微断层摄影术(XMT)的潜力。三维计算机重建可以以20 µm或更高的分辨率可视化动物,从而解决细微的,以前看不见的细节。回收的新数据包括(可能是拟晶形的)底栖动物在印度隐足蛇(Anthracomartidae)的腿部coxae上的留存,并突显了该家族与泥盆纪古猿科之间的进一步相似性。还发现身体扁平,前肢健壮,暗示着类似于现代蟹蜘蛛(Thomisidae)的狩猎姿态。 Eophrynus prestvicii(Eophrynidae)的肢体比较柔韧,但身上的装饰很重,在视口上有新近识别的上缘边缘棘。它的习性可与某些现代的放牧人(Opiliones)相提并论。这些发现证明了XMT潜在地改变了由菱铁矿承载的煤系化石的研究。

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