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3D morphometry of polyconitid rudist bivalves based on grinding tomography

机译：基于磨削断层扫描的多形双壳双壳类动物的3D形态学

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Previous taxonomic studies have shown that polyconitid rudists have a characteristic arrangement of the myocardinal system with an ectomyophoral cavity on the posterior side of the left valve. The specific arrangement of the myophores and associated cavities defines the different genera. However, there has been little research on the three-dimensional spatial distribution and size of the internal features, for want of a technique that is suitable for large and low density-contrast specimens. The tomographic technique described herein is based on automatic serial grinding and serial scanning; the resulting images are treated with biomedical image software. The technique has been applied to a pair of well-preserved specimens of Polyconites verneuili from the Upper Aptian of Spain. Fifteen quantitative characters have been obtained using multiplanar virtual cuts, volume-rendering, and isosurfaces reconstructions. The study revealed the shape, size, and distribution of the ectomyophoral, body and accessory cavities, the lengths and volumes of the teeth, and the arrangement of the myophores. We conclude that this technique facilitates the description of rudist bivalves and is suitable for other fossils; moreover, it has the potential to be used in other fields of geology.
机译：先前的分类学研究表明，多位生殖器医师在心肌系统中具有特征性排列，在左瓣膜的后侧有一个食管腔。菌丝体和相关腔的特定排列定义了不同的属。然而，由于缺乏适用于大和低密度对比样品的技术，关于三维空间分布和内部特征尺寸的研究很少。本文所述的断层扫描技术基于自动连续研磨和连续扫描。得到的图像用生物医学图像软件处理。该技术已被应用于西班牙上阿普提安地区一对保存完好的Polyconites verneuili标本。使用多平面虚拟切割，体绘制和等值面重建已获得了15个定量特征。这项研究揭示了外oph体，体腔和副腔的形状，大小和分布，牙齿的长度和体积，以及网状体的排列。我们得出的结论是，该技术有助于描述双壳贝类，并且适用于其他化石。而且，它有可能在其他地质领域中使用。

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