Cited by 177Paleontology and Stratigraphy of FossilsEvolution and Paleontology StudiesPaleontology and Evolutionary Biology

The Avalon Explosion: Evolution of Ediacara Morphospace

Shen, Bing, Dong, Lin, Xiao, Shuhai, Kowalewski, Michał·2008·Science

Abstract

Ediacara fossils [575 to 542 million years ago (Ma)] represent Earth's oldest known complex macroscopic life forms, but their morphological history is poorly understood. A comprehensive quantitative analysis of these fossils indicates that the oldest Ediacara assemblage—the Avalon assemblage (575 to 565 Ma)—already encompassed the full range of Ediacara morphospace. A comparable morphospace range was occupied by the subsequent White Sea (560 to 550 Ma) and Nama (550 to 542 Ma) assemblages, although it was populated differently. In contrast, taxonomic richness increased in the White Sea assemblage and declined in the Nama assemblage. These diversity changes, occurring while morphospace range remained relatively constant, led to inverse shifts in morphological variance. The Avalon morphospace expansion mirrors the Cambrian explosion, and both events may reflect similar underlying mechanisms.

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Crossref · 10.1126/science.1150279

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Authors
Shen, B., Dong, L., Xiao, S., & Kowalewski, M.
Affiliations
Virginia Tech (US)
Corresponding author
Xiao, Shuhai
Venue
Science
Published
2008-01-04
Volume
319
Issue
5859
Pages
81-84
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W1994731691
Cited by
177
References
36
Citations by year
2026: 4 · 2025: 8 · 2024: 6 · 2023: 8 · 2022: 6 · 2021: 9 · 2020: 12 · 2019: 24 · 2018: 8 · 2017: 4 · 2016: 13 · 2015: 12 · 2014: 12 · 2013: 4 · 2012: 6
FWCI
9.84
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 › Evolution and Paleontology Studies
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Evolutionary Biology
Keywords
Ediacaran fossils, morphospace, morphological evolution, Cambrian explosion, early animal diversification, taxonomic richness, Ediacaran-Cambrian transition
MeSH terms
Animals, Biological Evolution, Fossils, Seawater, Ecosystem, Biodiversity

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