TEM evidence for eukaryotic diversity in mid‐Proterozoic oceans
@article{Javaux2004TEMEF, title={TEM evidence for eukaryotic diversity in mid‐Proterozoic oceans}, author={Emmanuelle J Javaux and Andrew H. Knoll and Malcolm R. Walter}, journal={Geobiology}, year={2004}, volume={2} }
Biomarker molecular fossils in 2770 Ma shales suggest that the Eucarya diverged from other principal domains early in Earth history. Nonetheless, at present, the oldest fossils that can be assigned to an extant eukaryotic clade are filamentous red algae preserved in ca. 1200 Ma cherts from Arctic Canada. Between these records lies a rich assortment of potentially protistan microfossils. Combined light microscopy, scanning electron microscopy, and transmission electron microscopy on 1500‐1400 Ma…
213 Citations
Paleobiological perspectives on early eukaryotic evolution.
- Geography, BiologyCold Spring Harbor perspectives in biology
- 2014
Protists continued to diversify along with animals in the more pervasively oxygenated oceans of the Phanerozoic Eon, and the Mid-Neoproterozoic establishment or expansion of eukaryophagy provides a possible mechanism for accelerating eUKaryotic diversification long after the origin of the domain.
Eukaryotic organisms in Proterozoic oceans
- BiologyPhilosophical Transactions of the Royal Society B: Biological Sciences
- 2006
Focus on character evolution permits inferences about the innovations in cell biology and development that underpin the taxonomic and morphological diversification of eukaryotic organisms.
Micropaleontology of the lower Mesoproterozoic Roper Group, Australia, and implications for early eukaryotic evolution
- BiologyJournal of Paleontology
- 2017
Roper fossils provide direct or inferential evidence for many basic features of eukaryotic biology, including a dynamic cytoskeleton and membrane system that enabled cells to change shape, life cycles that include resting cysts coated by decay-resistant biopolymers, reproduction by budding and binary division, osmotrophy, and simple multicellularity.
The early eukaryotic fossil record.
- Geography, Environmental ScienceAdvances in experimental medicine and biology
- 2007
The record of biological innovations documented by the fossils shows that eukaryotes had evolved most cytological and molecular complexities very early in the Proterozoic but environmental conditions delayed their diversification within clades until oxygen level and predation pressure increased significantly.
Shale-hosted biota from the Dismal Lakes Group in Arctic Canada supports an early Mesoproterozoic diversification of eukaryotes
- Environmental Science, GeographyJournal of Paleontology
- 2021
Abstract. The Mesoproterozoic is an important era for the development of eukaryotic organisms in oceans. The earliest unambiguous eukaryotic microfossils are reported in late Paleoproterozoic shales…
Microfossils from the late Mesoproterozoic – early Neoproterozoic Atar/El Mreïti Group, Taoudeni Basin, Mauritania, northwestern Africa
- Geography, Environmental Science
- 2017
Eukaryotic red and green algae populated the tropical ocean 1400 million years ago
- Geography, Environmental Science
- 2021
Absence of biomarker evidence for early eukaryotic life from the Mesoproterozoic Roper Group: Searching across a marine redox gradient in mid‐Proterozoic habitability
- Environmental Science, GeographyGeobiology
- 2019
One of the first integrated investigations of Mesoproterozoic biomarker records performed in parallel with established inorganic redox proxy indicators reveals a temporally variable paleoredox structure through the Velkerri Formation as gauged from iron mineral speciation and trace-metal geochemistry, vacillating between oxic and anoxic.
Wall ultrastructure of an Ediacaran acritarch from the Officer Basin, Australia
- Environmental Science
- 2007
Well-preserved organic-walled microfossils referred to as acritarchs occur abundantly in Ediacaran deposits in the Officer Basin in Australia and a set of features suggests closer relationship to green algae than dinoflagellates.
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