陈丕基

• 1:中国科学院南京地质古生物研究所

摘要(Abstract)：

叶肢介是一种淡水甲壳类动物,个体不大,一般在几毫米到两厘米之间,软体有点像虾,具有很多附肢,雌雄异体,外裹一对几丁质壳瓣,形似蚌壳,但不如后者的钙质壳那么厚实坚硬。叶肢介从泥盆纪开始出现,中生代时其演化中心从欧洲迁移到了东亚,白垩纪它们的分异和演化达到顶峰,到了新生代则进入衰亡阶段。叶肢介化石一般出现在陆相地层中,由于它数量多、演化快、分布广泛,近年来已成为中国和邻近地区中生代非海相生物地层划分和对比研究的重要手段之一。中国大陆白垩系主要是陆相沉积,按古地理和生物地理区系,早白垩世可以划分为西南湖群和东北、东南、西北两个大区,前者出现的是直线叶肢介(Orthestheria)动物群,后者则是东方叶肢介(Eosestheria)和延吉叶肢介(Yanjiestheria)动物群;晚白垩世在西南湖群出现的是华美叶肢介(Aglestheria)动物群,在东北松花湖水系出现的是真瘤模叶肢介(Euestherites)动物群,在华中和东南沿海云梦泽水系出现的是薄壳叶肢介(Tenuestheria)动物群。链叶肢介(Halysestheria)是联系它们相互对比的共同分子;晚白垩世早期的线叶肢介(Nemestheria)动物群则在上述3个区系都有分布,甚至在西北喀什地区的塞诺曼期海陆交互相沉积和美国德克萨斯州同期海相地层的陆相夹层中都有发现的记录,它是将中国陆相白垩系与国际海相标准划分联系起来的重要证据。关于中国白垩纪的叶肢介动物群和有关陆相地层的划分对比,产东方叶肢介的义县组以前放在上侏罗统顶部或做为侏罗系-白垩系过渡层处理,这次按全国地层表将东方叶肢介群归入早白垩世。

关键词(KeyWords)： 生物地层学;生物地理区系;叶肢介;白垩纪;中国

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(No.91114201);; 国家重点基础研究发展计划(2012CB821906)资助研究和出版~~

作者(Author): 陈丕基

DOI: 10.19839/j.cnki.dcxzz.2012.02.011

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