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Summary The present study describes the conceptual framework of Adolf Naef’s idealistic morphology as presented at the onset of the 20th century. According to Naef, Haeckel’s and Gegenbaur’s approaches towards a phylogenetic biology were insufficient. He made it clear that Haeckel’s ideas were based on typological morphology. Thus, Haeckel’s views on comparative biology pointed back to pre-Darwinian...
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