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 inScience (American Association for the Advancement of Science) Vol. 225; no. 4659; pp. 317 - 319
Main Authors Malmgren, Björn A., Berggren, W. A., Lohmann, G. P.
Format Journal Article
LanguageEnglish
Published United States The American Association for the Advancement of Science 20.07.1984
American Association for the Advancement of Science
Subjects
Evolution
Fossils
Globorotalia
Gradualism
Marine
Observations
Oceans
Paleobiology
Paleontology
Phylogeny
Plankton research
Random walk
Sediments
Specimens
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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.
Bibliography:ObjectType-Article-1
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ISSN:0036-8075
1095-9203
DOI:10.1126/science.225.4659.317