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  • 4 - Ernst Haeckel’s Evolutionary Storytelling

  • Ronald A. Jenner, Natural History Museum, London
  • Book:
    Ancestors in Evolutionary Biology
    Published online:
    08 July 2022
    Print publication:
    28 July 2022, pp 86-121

  • Summary

    In this chapter I take a detailed look at the evolutionary storytelling of Ernst Haeckel. He founded phylogenetics as the science dedicated to tracing the evolution of lineages. Although Haeckel’s phylogenetic scenarios were nourished from a broad buffet of evidence, the biogenetic law was his favorite shortcut to create lineages of hypothetical ancestors, most famously the tiny cup-shaped Gastraea. A recent consensus has emerged that stigmatizes Haeckel’s phylogenies as unDarwinian constructs that are conceptually stained by teleological thinking and the linearity of the scala naturae. Instead, I argue that his trees are fully Darwinian, and that the linearity present in his trees and thinking is the linearity of evolving lineages that track the arrow of time. Lineage thinking was novel when Haeckel started writing, and his was marred by imperfections. It was up to the following generations of evolutionists to resolve the conceptual tension between the linear and branching aspects of evolution, a struggle that is still ongoing in today’s literature.