Late Ordovician (Hirnantian) diploporitan fauna of Anticosti Island, Quebec, Canada: implications for evolutionary and biogeographic patterns
Late Ordovician (Hirnantian) diploporitan fauna of Anticosti Island, Quebec, Canada: implications for evolutionary and biogeographic patterns
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加拿大魁北克安蒂科斯蒂岛晚奥陶世（赫南特）双孔动物群：对进化和生物地理模式的影响
DOI：
10.1139/cjes-2017-0160
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发表时间：
2018
影响因子：
1.4
通讯作者：
C. Sumrall
中科院分区：
文献类型：
--
作者：
Sarah L. Sheffield;W. Ausich;C. Sumrall
含有棘皮动物化石的Hirnantian（最新的奥陶纪）地区是罕见的;少数已被发现的主要含有脱节的海百合小骨。因此，对晚奥陶世-早志留世界线棘皮动物的演化动力学，尤其是非海百合棘皮动物的演化动力学知之甚少。新的diploporitan棘皮动物，Holocystites salmoensis和一个身份不明的holocystitid，从礁相的上奥陶统埃利斯湾组的Anticosti岛提供了一个关键的数据点diploporitan的地理和演化途径进行奥陶纪和志留纪。这些化石也为理解志留纪Holocystites动物群的祖先提供了至关重要的联系，这是一种来自北美志留纪中期的不寻常的双孔动物群，其起源至少可以追溯到1500万年前，比以前认为的要早。像这样的新化石数据强调了发现...
Hirnantian (latest Ordovician) localities containing echinoderm fossils are rare; the few that have been discovered primarily contain disarticulated crinoid ossicles. Therefore, relatively little is known about echinoderm evolutionary dynamics across the Late Ordovician – early Silurian boundary, especially noncrinoid echinoderms. New diploporitan echinoderms, Holocystites salmoensis and an unidentified holocystitid, from reefal facies of the Upper Ordovician Ellis Bay Formation of Anticosti Island provide a critical data point concerning diploporitan biogeography and evolutionary pathways undertaken during the Ordovician and Silurian. These fossils also provide a crucial link in understanding the ancestry of the Silurian Holocystites Fauna, an unusual diploporitan fauna from the middle Silurian of North America, whose origination dates back at least 15 million years earlier than previously thought with the discovery of taxa described here. New fossil data such as these stress the importance of uncovering...