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- Uncertainties in the age and phylogenetic position of Pinaceae fossils present significant obstacles to our
understanding of the timing of diversification in the family. We demonstrate that simultaneous phylogenetic
analyses of chloroplastDNA(matK and rbcL) and nonmolecular characters that include both extant genera and a
limited number of fossil taxa provide useful hypotheses for calibrating molecular trees. Root placements varied
for Pinaceae, with Bayesian analyses recovering mutually monophyletic subfamilies Pinoideae and Abietoideae
and parsimony analyses recovering Abietoideae as paraphyletic by placing the root between Cedrus and the
remaining genera. The inferred phylogenetic positions of fossil taxa Pityostrobus bernissartensis as the sister
group to Pinus and Pseudolarix erensis as the sister group to extant Pseudolarix were used to guide divergencetime
calibrations; these calibrations yielded an Early Cretaceous and an Early Jurassic age for crown-group
Pinaceae, respectively. The older age estimates based on Pseudolarix erensis are supported by weaker evidence
from the fossil record but are consistent with recent reports of Early Cretaceous leaf fossils that appear to coincide
with extant genera. There remains a great need to characterize the anatomy of extant and fossil species and to code
additional nonmolecular characters.
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| Citation |
- Gernandt, D. S., Magallón, S., López, G. G., Flores, O. Z., Willyard, A., & Liston, A. (2008). Use of simultaneous analyses to guide fossil-based calibrations of Pinaceae phylogeny [Electronic version]. International Journal of Plant Sciences, 169(8), 1086-1099.
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| Additional Information |
- description.provenance : Submitted by David Moynihan (dmscanner@gmail.com) on 2010-02-19T19:15:26Z
No. of bitstreams: 1
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Previous issue date: 2008-10
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