Bilaterian Burrows and Grazing Behavior at >585 Million Years Ago
Abstract
Early Burrowers: Direct fossil evidence of animals from Ediacaran period—the time in Earth's history just before extensive animal diversification in the Cambrian—is scant. However, the remains of animal activity in sediment, which remain intact through geologic time can provide clues about animal behavior and evolution. Pecoits et al. (p. 1693 ; see the Perspective by Droser and Gehling ) found a suite of fossil animal burrows in sedimentary rocks in Uruguay. Radiometric dating places the age of the structures at ∼585 million years old, coinciding with the likely emergence of stem-group bilaterians. The complex morphologies of the fossil burrows suggest that these animals actively grazed and had the ability to burrow deep within sediments.
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An earlier appearance of bilaterian trails (585 Ma) has been suggested, but the age of the trace-fossil-bearing strata is highly contended, probably being Late Palaeozoic, so these structures have not been included in the database.
“An earlier appearance of bilaterian trails (585 Ma) has been recently suggested [26]. However, the age of the trace-fossil-bearing strata is highly contended, probably being Late Palaeozoic [27]. Therefore, the structures previously mentioned [21,23,26] have not been included in our database.”
From Decoupling of body-plan diversification and ecological structuring during the Ediacaran–Cambrian transition: evolutionary and geobiological feedbacks (2014) · cites this paper as [26]
Complex animal life did not evolve until almost three billion years later in the Neoproterozoic.
“For reasons still debated, complex animal life did not evolve until almost three billion years later in the Neoproterozoic (e.g., Pecoits et al., 2012).”
From Trace elements at the intersection of marine biological and geochemical evolution (2016) · cites this paper as Pecoits et al., 2012
The lower and middle Ediacaran Period yields the predominantly macro-algal Lantian biota, microfossils of the Doushantuo Formation previously interpreted as embryos, multiple acritarchs, and putative trace fossils of bilaterian metazoans.
“The lower and middle Ediacaran Period yields the predominantly macro-algal Lantian biota (e.g.Yuan et al., 2011Yuan et al., , 2013)), microfossils of the Doushantuo Formation previously interpreted as embryos (see discussion in Xiao et al., 1998;Huldtgren et al., 2011;L. Chen et al., 2014), multiple acritarchs (e.g.Moczydlowska, 2005;Willman et al., 2006;Xiao et al., 2014), and putative trace”
From Remarkable insights into the paleoecology of the Avalonian Ediacaran macrobiota (2015) · cites this paper as Pecoits et al., 2012
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Fossil range extensions continue
Oard, M. J. (2013)
Surviving the depths: metazoan resilience in sulphidic aquaria environments
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- Authors
- Pecoits, E., Konhauser, K. O., Aubet, N. R., Heaman, L. M., Veroslavsky, G., Stern, R. A., & Gingras, M. K.
- Affiliations
- Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada.
- University of Alberta (CA)
- Universidad de la República de Uruguay (UY)
- ORCID
- Venue
- Science
- Published
- 2012-06-29
- Volume
- 336
- Issue
- 6089
- Pages
- 1693-1696
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W1971062738
- Semantic Scholar
- 67208b9cf59365309274feb5ff3cbfd31d17f0d6
- Cited by
- 73
- References
- 34
- Citations by year
- 2026: 2 · 2025: 2 · 2024: 2 · 2023: 1 · 2022: 4 · 2021: 3 · 2020: 4 · 2019: 1 · 2018: 6 · 2017: 4 · 2016: 11 · 2015: 10 · 2014: 10 · 2013: 8 · 2012: 5
- FWCI
- 7.81
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Science (publishedVersion)
- PubMed (publishedVersion)
- 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
- trace fossils, Ediacaran, zircon U-Pb geochronology, Neoproterozoic glaciation, early animal evolution, glaciomarine sediments
- MeSH terms
- Animals, Biological Evolution, Fossils, Time, Uruguay, Zirconium, Silicates, Geologic Sediments, Body Patterning
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