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2, 322–350. Cloud, P. (1965) Significance of the Gunflint (Precambrian) microflora. Science 148, 27–45. Cloud, P. (1972) A working model of the primitive Earth. Am. J. Sci. 272, 537–548. Cloud, P. (1983) Early biogeologic history: The emergence of a paradigm. In Earth’s Earliest Biosphere, An Interdisciplinary Study, ed. Schopf, J. W. (Princeton Univ. Press, Princeton, NJ), pp. 14–31. Cloud, P & Licari, G. R. (1968) Microbiotas of the banded iron formations. Proc. Nat. Acad. Sci. USA 61, 779–786.
In yeast, nematode, insect, and mammalian cells, nonkaryomastigont microtubule-organizing centers are “required to position nuclei at specific locations in the cytoplasm” (Raff, 1999). The link between the microtubule organizing center and the nuclei “is mysterious” (Raff, 1999). To TABLE 1. Karyomastigont distribution in unicellular protoctists Archaeprotista* Class Pelobiontids Metamonads Parabasalids Trichomonads Hypermastigids Genus Chlamydomonas Chlorella Acetabularia Subphyla Postciliodesmatophora Rabdophora Cyrtophora Class Amoebomastigotes Kinetoplastids Euglenids Pseudociliates Class Reticulomixids Foraminiferans Karyomastigont Kinetosome Nucleus +† – + + + + + +/– + +/– – Karyomastigont Kinetosome Nucleus + + – + Ciliophora + + Kinetosome Nucleus + + + + + + Kinetosome Nucleus – – + + +/– – – – Karyomastigont Kinetosome Nucleus –/+ + – – + + + + + – Chlorophyta Karyomastigont – – – Discomitochondria Karyomastigont + – –/?
1910, 1–39. Walcott,C. D. (1915) Discovery of Algonkian bacteria. Proc. Nat. Acad. Sci. USA 1, 256–257. Yochelson, E. L. (1967) Charles Doolittle Walcott 1850-1927. Biograph. , Nat. Acad. USA 39, 471–540. Yochelson, E. L. (1997) Charles Doolittle Walcott, Paleontologist (Kent State Univ. Press, Kent, OH). 3 The Chimeric Eukaryote: Origin of the Nucleus from the Karyomastigont in Amitochondriate Protists LYNN MARGULIS*, MICHAEL F. DOLAN*, and RICARDO GUERRERO‡ We present a testable model for the origin of the nucleus, the membrane-bounded organelle that defines eukaryotes.