Summary
A spiral running along the surface of a cone standing on top is proposed as a model for evolution, the progress of which is considered as composed of a linear progression following the direction of time and representing the linear increase in the number of taxa, while a circular component stands for the ever recurring functional types of organisms.
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Riedl, H. A model proposed for the process of evolution with special reference to plants. Acta Biotheor 21, 63–85 (1972). https://doi.org/10.1007/BF01556338
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DOI: https://doi.org/10.1007/BF01556338