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6 - Intuiting Evolution

Published online by Cambridge University Press:  08 July 2022

Ronald A. Jenner
Affiliation:
Natural History Museum, London
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Summary

In this chapter I survey how biologists and paleontologists have used their imagination and evolutionary intuitions to animate phylogenetic narratives. Many authors intuited the direction of character evolution from clues provided by the threefold parallelism. The form changes that can be observed during ontogeny, and those inferred from the stratigraphic sequence of fossils, have inbuilt time axes that can be used as shortcuts for proposing lineages of changing forms. But interpreting the polarity of character change suggested by the systematic leg of the threefold parallelism was less straightforward. Many researchers intuited or imposed the direction of evolutionary change by proposing smoothly transitional linear series of observed or imagined forms. Some evolutionary intuitions date back to pre-evolutionary times, while others emerged from the search for evolutionary laws, such as Cope’s rule of phyletic size increase. When the first molecular phylogenies were published, researchers often muted their once vocal evolutionary intuitions to accept sometimes deeply puzzling results. The complete suppression of the evolutionary imagination is associated with the flawed but widespread strategy of using observed differences between taxa as prima facie evidence against monophyly and homology. It frequently diverts phylogenetic debates into fruitless avenues.

Type
Chapter
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Ancestors in Evolutionary Biology
Linear Thinking about Branching Trees
, pp. 150 - 180
Publisher: Cambridge University Press
Print publication year: 2022

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  • Intuiting Evolution
  • Ronald A. Jenner, Natural History Museum, London
  • Book: Ancestors in Evolutionary Biology
  • Online publication: 08 July 2022
  • Chapter DOI: https://doi.org/10.1017/9781316226667.006
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  • Intuiting Evolution
  • Ronald A. Jenner, Natural History Museum, London
  • Book: Ancestors in Evolutionary Biology
  • Online publication: 08 July 2022
  • Chapter DOI: https://doi.org/10.1017/9781316226667.006
Available formats
×

Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Intuiting Evolution
  • Ronald A. Jenner, Natural History Museum, London
  • Book: Ancestors in Evolutionary Biology
  • Online publication: 08 July 2022
  • Chapter DOI: https://doi.org/10.1017/9781316226667.006
Available formats
×