梁艳,唐鹏,吴荣昌,栾晓聪,詹仁斌

• 1:现代古生物学和地层学国家重点实验室中国科学院南京地质古生物研究所
• 2:中国科学院大学

摘要(Abstract)：

通过对湖北宜昌界岭剖面中—上奥陶统庙坡组的几丁虫进行系统古生物学与生物地层学研究,鉴定出几丁虫18属43种。将庙坡组的几丁虫识别为Laufeldochitina stentor几丁虫带,并进一步划分为Cyathochitinasp.3和Armoricochitina granulifera两个亚带。除在庙坡组下部发现几丁虫以外,首次在庙坡组上部发现大量保存精美的几丁虫化石,填补了该层段以及华南该时段几丁虫研究的空白,丰富了华南晚奥陶世早期几丁虫的多样性记录。首次在华南报道冈瓦纳北部的典型分子Lagenochitina ponceti Rauscher,以及波罗的地区的特征分子Laufeldochitina stentor(Eisenack)和Cyathochitina sebyensis Grahn。根据几丁虫组合面貌特征及相关生物地层研究,认为晚奥陶世初期华南扬子区几丁虫的生物地理分区不明显,与波罗的、冈瓦纳北部、劳伦大陆以及阿凡隆尼亚板块皆具有一定的相似性。同时,L.stentor,C.sebyensis以及A.granulifera等波罗的地区典型分子在华南庙坡组的首次报道,增强了达瑞威尔晚期至桑比早期华南与波罗的地区地层对比的潜力。

关键词(KeyWords)： 生物地层;几丁虫;庙坡组;中-晚奥陶世;华南

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(No.41221001,41290260,41172012)资助

作者(Author): 梁艳,唐鹏,吴荣昌,栾晓聪,詹仁斌

DOI: 10.19839/j.cnki.dcxzz.2015.02.003

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• 1 Cyathochitinasp.3为庙坡组下部大量产出的一类极具特色的分子,为Cyathochitina属的一新种,其系统古生物学研究将在后续文章中与其他属种一起探讨。
• 2 由于化石保存及发掘的不完备性,理论上,每个种在其首现与末现层位之间均应存在。
• 1 Vandenbroucke et al.(2013)根据命名法的优先法则,将Cyathochitina giraffa Hennissen et al.,2010更名为Cyathochitina cycnea(Hennissen et al.,2010)