典型文献
Extinctions,Morphological Gaps,Major Transitions,Stem Groups,and the Origin of Major Clades,with a Focus on Early Animals
文献摘要：
Systematic extinctions can leave major morphological gaps between living crown-group clades.Such morphological gaps would be perceived,from a neontological point of view,as major evolutionary transitions.In order to fill these morphological gaps and to map the evolutionary steps toward major evolutionary transitions,we need to integrate extinct stem-group taxa in phylogenetic studies.However,the recognition of stem group has not been widely adopted in the study of early animal fossils,despite that all fossils are stem groups at one level or another.Part of the difficulty is that stem groups may not have all features that collectively diagnose the respective crown group,and they can have unique(autapomorphic)features,making them tantalizingly similar to and frustratingly different from the crown group(e.g.,stem-group eukaryotes can be prokaryotic and stem-group animals can be protistan).The need to embrace stem groups and to implement the PhyloCode,in order to achieve phylogenetic clarity and to offer key paleontological insights into the origin and early animal evolution,is illustrated in debates on several controversial Ediacaran and Cambrian fossils.
文献关键词：
中图分类号：
作者姓名：
XIAO Shuhai
作者机构：
Department of Geosciences,Virginia Tech,Blacksburg,Virginia 24061,USA
文献出处：
引用格式：
[1]XIAO Shuhai-.Extinctions,Morphological Gaps,Major Transitions,Stem Groups,and the Origin of Major Clades,with a Focus on Early Animals)[J].地质学报（英文版）,2022(06):1821-1829
A类：
Extinctions,neontological,autapomorphic,tantalizingly,frustratingly,protistan,PhyloCode
B类：
Morphological,Gaps,Major,Transitions,Stem,Groups,Origin,Clades,Focus,Early,Animals,Systematic,extinctions,can,leave,major,morphological,gaps,between,living,crown,clades,Such,would,perceived,from,point,view,evolutionary,transitions,In,order,fill,these,map,steps,toward,need,integrate,taxa,phylogenetic,studies,However,recognition,has,been,widely,adopted,study,early,fossils,despite,that,all,are,groups,one,level,another,Part,difficulty,may,have,features,collectively,diagnose,respective,they,unique,making,them,similar,different,eukaryotes,prokaryotic,animals,embrace,implement,achieve,clarity,offer,key,paleontological,insights,into,origin,illustrated,debates,several,controversial,Ediacaran,Cambrian
AB值：
0.543971
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