A Griesbachian (Early Triassic) mollusc fauna from the Sidazhai section, Southwest China, with palaeoecological insights on the proliferation of genus Claraia (Bivalvia)
A Griesbachian (Early Triassic) mollusc fauna from the Sidazhai section, Southwest China, with palaeoecological insights on the proliferation of genus Claraia (Bivalvia)
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中国西南部四寨剖面的格里斯巴赫期（早三叠世）软体动物群，以及对 Claraia 属（双壳纲）增殖的古生态学见解
DOI：
10.1007/s12583-017-0966-7
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发表时间：
2018
影响因子：
3.3
通讯作者：
Margaret L. Fraiser
中科院分区：
文献类型：
--
作者：
Yunfei Huang;Jinnan Tong;Margaret L. Fraiser
在二叠纪末大灭绝之后，在生存和恢复阶段最丰富和最引人注目的化石是claraia属（Bivalvia）。然而，claraia扩散的原因仍然存在争议。本文描述了在二叠纪末大灭绝后华南深水环境中发现的一个新的Griesbachian（早三叠世）软体动物区系。该动物群分属2属5种双壳类(Claraia griesbachi，C.；不多了,C。stachei C。radialis，和promyalina putiatinensis)和2个氨类物种（Ophiceras sp.和ussuridiscus sp.），可以归属于claraia wangi-C。格里斯巴氏组合带，表明格里斯巴氏中晚期。双壳类以克拉拉（Claraia griesbachia）为主，以关节状克拉拉（Claraia）化石为特征。由于它是附生的，它是一个优秀的本土动物群。早三叠世早期的研究表明，在全球浅海和深海由缺氧向缺氧转变的过程中，克拉拉属能够耐受缺氧和/或缺氧，其繁殖可能是由于其适应应激环境的生理特征。claraia的广泛分布可能与其浮游幼虫阶段有关。在那里，克拉拉虫的幼虫可能被洋流运输，增加了远距离传播的潜力。此外，根据对华南早三叠世的观测，克拉莱亚是一个重要的灾害和机会性分类单元。
After the end-Permian mass extinction, genusClaraia(Bivalvia) was the most abundant and most noticeable fossil during the survival and recovery stage. However, the reasons for the proliferation ofClaraiaare still debated. This paper describes a new Griesbachian (Early Triassic) mollusc fauna from deep-water settings in South China in the aftermath of end-Permian mass extinction. This fauna yielded five bivalve species in two genera (Claraia griesbachi,C. wangi,C. stachei,C. radialis, andPromyalina putiatinensis) and two ammonoid species (Ophiceras sp.andUssuridiscus sp.) and could be assigned to theClaraia wangi-C. griesbachiassemblage zone, indicating a Middle-Late Griesbachian Age. The bivalves were dominated byClaraia griesbachiand were featured by articulated Claraia fossils. AsClaraiawas epibyssate, it was an excellent autochthonous fauna. While the shallow and deep marine water became dysoxic to anoxic globally, as indicated by recent studies of the early Early Triassic, we suggest the genus Claraia could tolerate dysoxic and/or anoxic conditions and its proliferation could be attributed to its physiological features which were adapted to the stressed environment. The wide distribution ofClaraiawas probably related to its planktonic larval stage. Where the larva ofClaraiacould have been transported by ocean flow and increased its potential for long-distance dispersal. In addition,Claraiawas a significant disaster and opportunistic taxon during the Early Triassic based on observations in South China.