Cited by 73Paleontology and Stratigraphy of FossilsPaleontology and Evolutionary BiologyEvolution and Paleontology Studies

Fractal branching organizations of Ediacaran rangeomorph fronds reveal a lost Proterozoic body plan

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Hoyal Cuthill, Jennifer F., Conway Morris, Simon·2014·Proceedings of the National Academy of Sciences

Abstract

The branching morphology of Ediacaran rangeomorph fronds has no exact counterpart in other complex macroorganisms. As such, these fossils pose major questions as to growth patterns, functional morphology, modes of feeding, and adaptive optimality. Here, using parametric Lindenmayer systems, a formal model of rangeomorph morphologies reveals a fractal body plan characterized by self-similar, axial, apical, alternate branching. Consequent morphological reconstruction for 11 taxa demonstrates an adaptive radiation based on 3D space-filling strategies. The fractal body plan of rangeomorphs is shown to maximize surface area, consistent with diffusive nutrient uptake from the water column (osmotrophy). The enigmas of rangeomorph morphology, evolution, and extinction are resolved by the realization that they were adaptively optimized for unique ecological and geochemical conditions in the late Proterozoic. Changes in ocean conditions associated with the Cambrian explosion sealed their fate.

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Crossref · 10.1073/pnas.1408542111

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  • The fractal organisation of early fronds such as Rangea and their large surface area may imply that these organisms fed, at least partly, via absorption of dissolved organic carbon (DOC) from seawater.

    “An additional point in favour of their interpretation as stem-group metazoans is the fractal organisation of the early fronds such as Rangea ; a large surface area (especially given the lack of any other feeding structures) may imply that these organisms fed, at least partly, via absorption of DOC from the sea water”

    From The origin of the animals and a 'Savannah' hypothesis for early bilaterian evolution (2017) · cites this paper as Hoyal Cuthill & Conway Morris, 2014

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Authors
Hoyal Cuthill, J. F., & Conway Morris, S.
Affiliations
Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, United Kingdom
Venue
Proceedings of the National Academy of Sciences
Published
2014-08-11
Volume
111
Issue
36
Pages
13122-13126
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W1634335261
Cited by
73
References
48
Citations by year
2026: 2 · 2025: 4 · 2024: 9 · 2023: 4 · 2022: 2 · 2021: 8 · 2020: 5 · 2019: 1 · 2018: 10 · 2017: 11 · 2016: 6 · 2015: 8 · 2014: 3
FWCI
6.80
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Department of Earth Sciences EPrints Repository (acceptedVersion)
  • Open Access at Essex (University of Essex) (submittedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Evolutionary Biology
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
Keywords
fractal branching, body plan, L-systems, morphological reconstruction, adaptive radiation, osmotrophy, functional morphology, Cambrian explosion
MeSH terms
Animals, Animal Structures, Fossils, Time Factors, Fractals, Imaging, Three-Dimensional

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