Species Formation through Punctuated Gradualism in Planktonic Foraminifera
Detailed analysis of evolutionary changes in a 10-million-year long Late neogene lineage of planktonic foraminifera has revealed a pattern that is not consistent with either the gradualistic or the punctuational model of evolution. The lineage was in stasis over a considerable part of its total dura...
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Published in | Science (American Association for the Advancement of Science) Vol. 225; no. 4659; pp. 317 - 319 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
United States
The American Association for the Advancement of Science
20.07.1984
American Association for the Advancement of Science |
Subjects | |
Online Access | Get full text |
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Summary: | Detailed analysis of evolutionary changes in a 10-million-year long Late neogene lineage of planktonic foraminifera has revealed a pattern that is not consistent with either the gradualistic or the punctuational model of evolution. The lineage was in stasis over a considerable part of its total duration but underwent relatively rapid, but not geologically instantaneous, gradual morphologic change that did not lead to lineage splitting. The term punctuated gradualism is suggested for this evolutionary modality. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0036-8075 1095-9203 |
DOI: | 10.1126/science.225.4659.317 |