ArticleProceedings. Biological sciences2020
The ammonite septum is not an adaptation to deep water: re-evaluating a centuries-old idea.
Article in Proceedings. Biological sciences, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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7 citing papers in PubMed, 17 citations in OpenAlex.
- Fractal-like geometry as an evolutionary response to predation?Science advances · 2023Article
- Is the relative thickness of ammonoid septa influenced by ocean acidification, phylogenetic relationships and palaeogeographic position?Swiss journal of palaeontology · 2022Article
- Significance of the suture line in cephalopod taxonomy revealed by 3D morphometrics in the modern nautilids Nautilus and Allonautilus.Scientific reports · 2021Article
- Buoyancy control in ammonoid cephalopods refined by complex internal shell architecture.Scientific reports · 2021Article
- A reply to a comment on Lemanis (2020): The ammonite septum is not an adaptation to deep water.Proceedings. Biological sciences · 2021Article
- A comment on Lemanis (2020): The ammonite septum is not an adaptation to deep water.Proceedings. Biological sciences · 2021Article
- The Intertwined Evolution and Development of Sutures and Cranial Morphology.Frontiers in cell and developmental biology · 2021Review
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Abstract
The shells of ammonoid cephalopods are among the most recognizable fossils, whose fractally folded, internal walls (septa) have inspired many hypotheses on their adaptive value. The enduring explanation for their iterative evolution is that they strengthen the shell against pressure at increasing water depths. The fossil record does not definitively support this idea and much of the theoretical mechanical work behind it has suffered from inaccurate testing geometries and conflicting results. By using a different set of mathematical methods compared with previous studies, I generate a system of finite-element models that explore how different parameters affect the shell's response to water pressure. Increasing the number of initial folds of the septa ultimately has little to no effect on the resulting stress in the shell wall or the septum itself. The introduction of higher-order folds does reduce the tensile stress in the shell wall; however, this is coupled with a higher rate of increase of tensile stress in the septum itself. These results reveal that the increase in complexity should not be expected to have a significant effect on the shell's strength and suggests that the evolution of ammonitic septa does not reflect a persistent trend towards deeper-water habitats.
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