| 浙赣交界地区中奥陶世笔石动物宏进化初探 |
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| 引用本文： | 张元动,陈旭.浙赣交界地区中奥陶世笔石动物宏进化初探[J].现代地质,1999,13(4):395-398. |
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| 作者姓名： | 张元动 陈旭 |
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| 作者单位： | 中国科学院南京地质古生物研究所!南京210008 |
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| 基金项目： | 中国科学院古生物与古人类学科基础研究!(项目号 :
980 3 12 )特别支持费，中国科学院南京地质古生物研究所现代古生物学和地层学开放 |
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| 摘 要： | 中奥陶世是继早寒武世生命大爆发之后生物多样化的又一关键时期。对浙赣交界地区中奥陶世生物地层及其笔石动物的研究表明 :( 1 )在此期间笔石动物多样性显著增加 ,但不同的笔石类群具有不同的变化趋势 ,总体上呈现为断续式 ( disjunctpattern) ;( 2 )笔石动物不同类群的这种差异性反应可能和这些类群的系统发育历史有关 ;( 3)双笔石动物群的起源主要通过异时发育 ,其早期进化历史则由一系列快速、定向、多幕式的成种事件组成
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| 关 键 词： | 浙赣交界地区 中奥陶世 笔石动物 宏进化 |
INSIGHTSON THE MACROEVOLUTION OF MIDDLE ORDOVICIAN GRAPTOLITES FROM THE BORDER AREA OF ZHEJIANG AND JIANGXI PROVINCES |
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| Zhang Yuandong,Chen Xu.INSIGHTSON THE MACROEVOLUTION OF MIDDLE ORDOVICIAN GRAPTOLITES FROM THE BORDER AREA OF ZHEJIANG AND JIANGXI PROVINCES[J].Geoscience——Journal of Graduate School,China University of Geosciences,1999,13(4):395-398. |
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| Authors: | Zhang Yuandong Chen Xu |
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| Abstract: | Middle Ordovician is regarded as another critical period of biodiversification after the Early Cambrian bioradiation.The study of the Middle Ordovician biostratigraphy and graptolites from the border area of Zhejiang and Jiangxi provinces indicates:( 1 ) the graptolites diversity increases remarkably in thisperiod,but different groups present different trends and show a disjunct pattern;( 2 ) the differential responses of graptolite groups may be closely related with their distinct phylogeny;( 3) diplograptoids origins from pseudisograptids in Middle Ordovician via heterochrony,and the subsequentevolution of early diplograptoids is represented by a series of rapid,directed and episodic speciations. |
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| Keywords: | border area of Zhejiang and Jiangxiprovinces Middle Ordovician graptolite macroevolution |
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