The “earliest tabulate corals” are not tabulates
The “earliest tabulate corals” are not tabulates
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DOI：
10.1130/g48235.1
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发表时间：
2020-11
期刊：
影响因子：
5.8
通讯作者：
R. J. Elias;Dong-Jin Lee;B. Pratt
中科院分区：
文献类型：
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作者：
R. J. Elias;Dong-Jin Lee;B. Pratt
假定的可追溯到寒武纪大爆发的表格状珊瑚并不是真正的表格。早期奥陶纪化石被确定为地衣珊瑚，之前被认为是最早的板状珊瑚，实际上属于阿姆萨西亚，它可能是一种钙质藻类。最早确定的板状物种出现在中奥陶世末期，作为奥陶纪大生物多样性事件的一部分，早于晚奥陶世最早确认属于地衣属的板状物种的出现。由于寒武纪（第 2 纪）类板状化石与真正板状化石的出现相隔约 50 米的时间跨度，因此不太可能存在直接的系统发育联系。因此，需要重新考虑对板状珊瑚的起源和进化历史的普遍理解。在确定奥陶纪生物多样性大事件所涉及的生物和地质因素时，必须考虑到古生代珊瑚、板状珊瑚和红珊瑚这两个主要群体同时出现在不同的古大陆上。
Putative tabulate-like corals dating to the Cambrian Explosion are not true tabulates. Early Ordovician fossils identified as Lichenaria and previously accepted as the earliest tabulate corals actually belong to Amsassia, which may be a calcareous alga. The earliest definite tabulates appeared in the latest Middle Ordovician as part of the Great Ordovician Biodiversification Event, prior to the earliest confirmed occurrence of tabulate species that do belong to Lichenaria in the Late Ordovician. With Cambrian (Epoch 2) tabulate-like fossils being separated from the appearance of true tabulates by a time span of ∼50 m.y., a direct phylogenetic connection is unlikely. Thus, the prevailing understanding of the origin and evolutionary history of tabulate corals needs to be reconsidered. The appearance of both major groups of Paleozoic corals, tabulates and rugosans, at the same time on separate paleocontinents must be taken into account in determining biological and geological factors involved in the Great Ordovician Biodiversification Event.