Brachiopod survival and recovery from the latest Ordovician mass extinctions in South China
Brachiopod survival and recovery from the latest Ordovician mass extinctions in South China
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DOI：
10.1002/(sici)1099-1034(199911/12)34:4
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发表时间：
1999-11
影响因子：
1.8
通讯作者：
Jia-Yu Rong;D. Harper
中科院分区：
文献类型：
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作者：
Jia-Yu Rong;D. Harper
华南地区上奥陶统和下志留统有许多完整的剖面。腕足动物数据，包括130腕足动物属，分配到13个目和27个总科从中期阿什吉尔晚Aeronian间隔揭示，腕足动物宏观演化之前和之后的最新奥陶纪大规模灭绝显示了重要的变化，在多样性，组成和地层分布的门。奥陶纪末次大灭绝前的动物群平台期（Ashgill中期，Rawtheyan）;第一次大灭绝后的生存-恢复期（Ashgill晚期，Normalograptus extraordinarius带和低Glyptograptus？persculptus区; Hirnantian）;（3）第一个生存间隔后的大灭绝（最新阿什吉尔，上Glyptograptus？persculptus区; end Hirnantian）;（4）大灭绝后的第二个生存期（最早的Llandovery，Parakidograptus acuminatus带;早至中期Rhuddanian）;（5）志留纪的恢复期（早至中期Llandovery;晚期Rhuddanian至早期Aeronian）;（6）志留纪的辐射期（中期Llandovery;中期至晚期Aeronian）。上扬子陆表海南部边缘地区在早至中鲁丹期仅发现了以奥陶纪残遗和少量Lazarus类群及祖先为特征的近岸、低多样性的底栖生物组合（主要为BA 2）。它们在鲁丹晚期至Aeronian早期被新建立的志留纪腕足动物群落（主要是BA 2 -3）所取代。这些标志着许多新进化的地方性形式和新移民，表达了明确的恢复内的腕足类，但恢复的主要腕足类的间隔是heteroacidosis。中国志留纪腕足动物群主要由本土的Atrypida、Pentamerida和Spiriferida组成，其中有来自Baltica和Avalonia等地的球齿类，这两个物种在中国的生存期内是明显的避难所。无锥目是卢顿晚期腕足动物中第一个出现多样性的主要类群。版权所有© 1999年约翰威利父子有限公司。
South China contains many complete sections through the upper Ordovician and lower Silurian. Brachiopod data including 130 brachiopod genera, assigned to 13 orders and 27 superfamilies from mid-Ashgill through late Aeronian intervals reveal that brachiopod macroevolution before and after the latest Ordovician mass extinction shows important changes in the diversity, composition and stratigraphical distribution of the phylum. The following six intervals are recognized: (1) a faunal plateau before the latest Ordovician mass extinction (mid-Ashgill, Rawtheyan); (2) a survival–recovery interval following the first phase of the mass extinction (late Ashgill, Normalograptus extraordinarius Zone and lower Glyptograptus? persculptus Zone; Hirnantian); (3) first survival interval following the mass extinction (latest Ashgill, upper Glyptograptus? persculptus Zone; end Hirnantian); (4) a second survival interval after the mass extinction (earliest Llandovery, Parakidograptus acuminatus Zone; early to mid-Rhuddanian); (5) a recovery interval in the Silurian (early to mid-Llandovery; late Rhuddanian to early Aeronian); and (6) a radiation interval in the Silurian (mid-Llandovery; mid- to late Aeronian). Only near-shore, low-diversity, benthic assemblages (mainly BA2), characterized by Ordovician relicts with a few Lazarus taxa and progenitors, are known from the southern marginal area of the Upper Yangtze epicontinental sea during the early to mid-Rhuddanian. They were replaced by newly established Silurian brachiopod communities (mainly BA2–3) in the late Rhuddanian to early Aeronian. These are marked by many newly evolved endemic forms and new immigrants, expressing a clear recovery within the Brachiopoda, but the recovery interval of the major brachiopod groups was heterochronous. In China the typical Silurian brachiopod fauna was mainly composed of indigenous Atrypida, Pentamerida and Spiriferida with stropheodontids derived from elsewhere, such as Baltica and Avalonia, two apparent refugia in the survival interval. The Atrypida was the first major group of Brachiopoda to diversity in the late Rhuddanian. Copyright © 1999 John Wiley & Sons, Ltd.