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On the early origins of major biologic groups

Published online by Cambridge University Press:  08 April 2016

David M. Raup
David M. Raup*
Affiliation:
Department of the Geophysical Sciences, University of Chicago, Chicago, Illinois 60637
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Abstract

The commonly observed fact that the principal biologic groups appear early in an adaptive radiation is shown to be an artifact of the geometry of the evolutionary tree. For marine invertebrates of the Phanerozoic, total diversity and species turnover rates combine to make early origins of major groups inevitable. This is demonstrated through an analysis of the theoretical probability distribution of divergence time (time to most recent common ancestor) in comparison with observed distributions. Whereas the fact of early origins does not require ecological explanations, the interpretation of the morphologic distinctness of major groups when they first appear remains an ecological problem.

Type
Research Article
Information
Paleobiology , Volume 9 , Issue 2 , Spring 1983 , pp. 107 - 115
Copyright
Copyright © The Paleontological Society 

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References

Literature Cited

Nicol, D., Desborough, G. A., and Solliday, J. R. 1959. Paleontologic record of the primary differentiation in some major invertebrate groups. J. Washington Acad. Sci. 49:351–366.Google Scholar
Raup, D. M. 1975. Taxonomic diversity estimation using rarefaction. Paleobiology 1:333–342.Google Scholar
Raup, D. M. 1978. Cohort analysis of generic survivorship. Paleobiology 4:1–15.Google Scholar
Sepkoski, J. J. Jr. 1979. A kinetic model of Phanerozoic taxonomic diveristy. II. Early Phanerozoic families and multiple equilibria. Paleobiology 5:222–251.Google Scholar
Sepkoski, J. J. Jr. 1982. A compendium of fossil marine families. Milwaukee Public Mus. Contrib. no. 51. 125 pp.Google Scholar
Sepkoski, J. J. Jr., Bambach, R. K., Raup, D. M., and Valentine, J. W. 1981. Phanerozoic marine diversity and the fossil record. Nature 293:435–437.Google Scholar
Sibley, C. G. and Ahlquist, J. E. 1982. The phylogeny and classification of the passerine birds, based on comparisons of the genetic material, DNA. Proc. 18th Internat. Ornith. Congress (Moscow, 1982), in press.Google Scholar
Stanley, S. M., Signor, P. W. III, Lidgard, S., and Karr, A. F. 1981. Natural clades differ from “random” clades: simulations and analyses. Paleobiology 7:115–127.Google Scholar
Valentine, J. W. 1969. Patterns of taxonomic and ecological structure of the shelf benthos during Phanerozoic time. Palaeontology 12:684–709.Google Scholar
Valentine, J. W. 1970. How many marine invertebrate fossil species? A new approximation. J. Paleontology 44:410–415.Google Scholar
Valentine, J. W. 1973. Evolutionary Paleoecology of the Marine Biosphere. 511 pp. Prentice-Hall, Englewood Cliffs, N.J.Google Scholar
Valentine, J. W. 1980. Determinants of diversity in higher taxonomic categories. Paleobiology 6:444–450.Google Scholar
Valentine, J. W., Foin, T. C., and Peart, D. 1978. A provincial model of Phanerozoic marine diversity. Paleobiology 4:55–66.Google Scholar
Van Valen, L. 1973. Are categories in different phyla comparable? Taxon 22:333–373.Google Scholar
Willis, J. C. 1940. The Course of Evolution by Differentiation or Divergent Mutation Rather than by Selection. 207 pp. Cambridge Univ. Press, Cambridge.Google Scholar