Biomechanical analyses point to dense collagen fibre architecture in an Ediacaran frond.
5 affiliations
- 1Natural History Museum , London, UK.
- 2University of Cambridge , Cambridge, UK.
- 3Department of Zoology, University of Cambridge , Cambridge, UK.
- 4School of Earth Sciences, University of Bristol , Bristol, UK.
- 5Dalian University of Technology , Dalian, Liaoning, People's Republic of China.
Abstract
Ediacaran macrofossils record the earliest large and complex organisms on Earth. Despite extensive study, fundamental aspects of their internal anatomy and tissue composition remain poorly known, limiting understanding of how these organisms were constructed and functioned, as well as how their complex anatomies evolved. Here, we establish a new quantitative biomechanical framework to infer tissue properties in the Ediacaran frond Charniodiscus. Analyses of fossil morphology, numerical simulations and dimensional analysis indicate that the commonly preserved twisted forms reflect three-dimensional torsional deformation driven by turbidity flow-induced instability. By mapping deformation modes in dimensionless phase space, we calculate a Young's modulus consistent with densely aligned collagen fibres, under a eumetazoan framework. These results point to the presence of a load-bearing stem and substantial functional specialization. The inferred mechanical properties are largely incompatible with non-animal, sponge or placozoan tissues, and independently strengthen the proposal that Charniodiscus was a total-group eumetazoan. The presence of these tissues marked a foundational evolutionary step, providing the scaffolding for increased size, complexity and innovation in early animals.
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BibTeX
@article{wang2026biomechanical,
title = {{Biomechanical analyses point to dense collagen fibre architecture in an Ediacaran frond.}},
author = {Zekun Wang and Princess Buma-At and Nile P Stephenson and Frances Dunn and Qianze Zhuang and Emily Mitchell and Imran A Rahman},
journal = {Proceedings. Biological sciences},
year = {2026},
month = oct,
doi = {10.1098/rspb.2026.1630},
url = {https://europepmc.org/article/MED/42869480},
note = {CC BY},
}
RIS
TY - JOUR
TI - Biomechanical analyses point to dense collagen fibre architecture in an Ediacaran frond.
AU - Zekun Wang
AU - Princess Buma-At
AU - Nile P Stephenson
AU - Frances Dunn
AU - Qianze Zhuang
AU - Emily Mitchell
AU - Imran A Rahman
PY - 2026
DA - 2026/10/01
JO - Proceedings. Biological sciences
DO - 10.1098/rspb.2026.1630
UR - https://europepmc.org/article/MED/42869480
AB - Ediacaran macrofossils record the earliest large and complex organisms on Earth. Despite extensive study, fundamental aspects of their internal anatomy and tissue composition remain poorly known, limiting understanding of how these organisms were constructed and functioned, as well as how their complex anatomies evolved. Here, we establish a new quantitative biomechanical framework to infer tissue properties in the Ediacaran frond Charniodiscus. Analyses of fossil morphology, numerical simulations and dimensional analysis indicate that the commonly preserved twisted forms reflect three-dimensional torsional deformation driven by turbidity flow-induced instability. By mapping deformation modes in dimensionless phase space, we calculate a Young's modulus consistent with densely aligned collagen fibres, under a eumetazoan framework. These results point to the presence of a load-bearing stem and substantial functional specialization. The inferred mechanical properties are largely incompatible with non-animal, sponge or placozoan tissues, and independently strengthen the proposal that Charniodiscus was a total-group eumetazoan. The presence of these tissues marked a foundational evolutionary step, providing the scaffolding for increased size, complexity and innovation in early animals.
SN - 0962-8452
SN - 1471-2954
ER -