The oldest deep-boring bivalves? Evidence from the Silurian of Gotland (Sweden)
The oldest deep-boring bivalves? Evidence from the Silurian of Gotland (Sweden)
复制标题
最古老的深钻双壳类动物？
DOI：
10.1007/s10347-019-0570-7
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发表时间：
2019
期刊：
影响因子：
1.8
通讯作者：
Oswald
中科院分区：
文献类型：
--
作者：
Claussen;Munnecke;Wilson;Oswald
与现代生物侵蚀相比，古生代生物侵蚀罕见，尤其是宏观生物侵蚀。哥特兰岛（瑞典）独特而神秘的志留纪珊瑚礁，由苔藓虫和微生物层合物组成，显示出大量生物侵蚀的证据。样品中含有锥虫化石，以及大量未描述的大钻孔。在这些大钻孔中，从薄切片中可以辨认出小的铰接双壳。微计算机断层扫描（microCT）的三维图像显示了一个额外的双壳类动物，它占据了生物侵蚀痕迹。该标本可能包含在另一个钻孔中，该钻孔可能被分类为棒状。此外，筑巢的证据，如后来对鱼化石的修改，比痕迹小得多的双壳类动物的存在，或其他标本的存在，都缺失了；因此，这些钻孔很可能是双壳类动物制造的。这是志留系存在深钻双壳类的证据。
Compared to modern counterparts, bioerosion is rare in Paleozoic reefs, especially macro-bioerosion. The unique and enigmatic Silurian reefs from Gotland (Sweden), composed of bryozoans and microbial laminates, show evidence of a large amount of bioerosion. The samples containTrypanitestrace fossils, as well as a large number of undescribed macroborings. Small articulated bivalve shells are preserved in some of these macroborings, identified from thin-sections. Three-dimensional images from micro-computed tomography (microCT) reveal an additional bivalve, which is occupying a bioerosion trace. This specimen is possibly contained in a different boring that can be classified as possibly clavate-shaped. Furthermore, evidence of nestling, such as a subsequent modification of the ichnofossils, the presence of bivalves that are much smaller than the trace, or the presence of additional specimens, is missing; therefore, it is most likely that the bivalves made the borings. This is evidence for the existence of deep-boring bivalves in the Silurian.
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