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34547602723
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D. E. G. Briggs, Ed, Peabody Museum of Natural History, Yale Univ, New Haven, CT
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N. C. Hughes, in Evolving Form and Function: Fossils and Development, D. E. G. Briggs, Ed. (Peabody Museum of Natural History, Yale Univ., New Haven, CT, 2005), pp. 139-158.
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Hughes, N.C.1
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K. J. McNamara, Ed, Belhaven, London
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R. A. Fortey, R. M. Owens, in Evolutionary Trends, K. J. McNamara, Ed. (Belhaven, London, 1990), pp. 121-142.
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(1990)
Evolutionary Trends
, pp. 121-142
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Fortey, R.A.1
Owens, R.M.2
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17
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34547598619
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Materials and methods are available as supporting material on Science Online.
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Materials and methods are available as supporting material on Science Online.
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20
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84869108997
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T. J. Cotton, R. A. Fortey, in Crustocea and Arthropod Relationships, S. Koenemann, R. A. Jenner, Eds., 16 of Crustacean Issues (Taylor & Francis, Boca Raton, FL, 2005), pp. 95-136.
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T. J. Cotton, R. A. Fortey, in Crustocea and Arthropod Relationships, S. Koenemann, R. A. Jenner, Eds., vol. 16 of Crustacean Issues (Taylor & Francis, Boca Raton, FL, 2005), pp. 95-136.
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22
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34547589530
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Extremely poor taxonomic representation may bias estimates of Late Cambrian intraspecific variation. Ptychopariid clades underwent a series of pronounced radiations during the Late Cambrian and accounted for most of the trilobite diversity at this time, but are grossly undersampled in the present study only eight species represented
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Extremely poor taxonomic representation may bias estimates of Late Cambrian intraspecific variation. Ptychopariid clades underwent a series of pronounced radiations during the Late Cambrian and accounted for most of the trilobite diversity at this time, but are grossly undersampled in the present study (only eight species represented).
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33
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34547582388
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Developmental regulation controlling morphogenesis of the features coded in cladistic analyses of trilobites must have lain downstream of the hypothesized kernels of gene-regulatory networks specifying body-plan architecture (32, Complex, phylum-defining characters are not seen to vary within species, and their long-term stability renders consideration of their evolution as population polymorphisms writ large inappropriate 31, The decline in intraspecific variation documented here is therefore unlikely to simply extrapolate into an explanation for the uniqueness of the Cambrian radiation of metazoans
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Developmental regulation controlling morphogenesis of the features coded in cladistic analyses of trilobites must have lain downstream of the hypothesized kernels of gene-regulatory networks specifying body-plan architecture (32). Complex, phylum-defining characters are not seen to vary within species, and their long-term stability renders consideration of their evolution as "population polymorphisms writ large" inappropriate (31). The decline in intraspecific variation documented here is therefore unlikely to simply extrapolate into an explanation for the uniqueness of the Cambrian radiation of metazoans.
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35
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34547602118
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R. Fortey, T. Cotton, S. Westrop, J. Adrain, and G. Edgecombe discussed aspects of character coding and taxonomic sampling in their cladistic analyses. A. R. Palmer assisted in determining the stratigraphic provenance of several species. Comments from D. Jablonski, M. Foote, P. Wagner, P. Crane, B. Sinclair, and two reviewers helped improve the analysis and manuscript. L. Qin translated Chinese literature. Fig. 51 was drafted by M. Foote.
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R. Fortey, T. Cotton, S. Westrop, J. Adrain, and G. Edgecombe discussed aspects of character coding and taxonomic sampling in their cladistic analyses. A. R. Palmer assisted in determining the stratigraphic provenance of several species. Comments from D. Jablonski, M. Foote, P. Wagner, P. Crane, B. Sinclair, and two reviewers helped improve the analysis and manuscript. L. Qin translated Chinese literature. Fig. 51 was drafted by M. Foote.
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