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Paleobiology; June 2005; v. 31; no. 2_Suppl; p. 175-191; DOI: 10.1666/0094-8373(2005)031[0175:IAOITO]2.0.CO;2
© 2005 Paleontological Society
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"Imperfections and oddities" in the origin of the nucleus

Lynn Margulis1, Michael F. Dolan1 and Jessica H. Whiteside2

1 Lynn Margulis and Michael Dolan. Department of Geosciences, University of Massachusetts, Amherst, Massachusetts 01003. mdolan{at}geo.umass.edu
2 Jessica H. Whiteside. Department of Earth and Environmental Sciences. Lamont-Doherty Earth Observatory of Columbia University. Palisades, New York 10964. jhw{at}ldeo.columbia.edu

 "Dual terminologies should be reserved for the exclusive use of those who prefer confusion to clarity." L. R. Cleveland, 1963

We outline a plausible evolutionary sequence that led from prokaryotes to the origin of the first nucleated cell. The nucleus is postulated to evolve after the archaebacterium and eubacterium merged to form the symbiotic ancestor of amitochondriate protists. Descendants of these amitochondriate cells (archaeprotists) today thrive in organic-rich anoxic habitats where they are amenable to study. Eukaryosis, the origin of nucleated cells, occurred by the middle Proterozoic Eon prior to the deposition in sediments of well-preserved microfossils such as Vandalosphaeridium and the spiny spheres in the Doushantou cherts of China.




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