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Divergence Time Estimation Using Fossils as Terminal Taxa and the Origins of Lissamphibia

Pyron, R. Alexander·2011·Systematic Biology
DOI 10.1093/sysbio/syr047
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Abstract

Were molecular data available for extinct taxa, questions regarding the origins of many groups could be settled in short order. As this is not the case, various strategies have been proposed to combine paleontological and neontological data sets. The use of fossil dates as node age calibrations for divergence time estimation from molecular phylogenies is commonplace. In addition, simulations suggest that the addition of morphological data from extinct taxa may improve phylogenetic estimation when combined with molecular data for extant species, and some studies have merged morphological and molecular data to estimate combined evidence phylogenies containing both extinct and extant taxa. However, few, if any, studies have attempted to estimate divergence times using phylogenies containing both fossil and living taxa sampled for both molecular and morphological data. Here, I infer both the phylogeny and the time of origin for Lissamphibia and a number of stem tetrapods using Bayesian methods based on a data set containing morphological data for extinct taxa, molecular data for extant taxa, and molecular and morphological data for a subset of extant taxa. The results suggest that Lissamphibia is monophyletic, nested within Lepospondyli, and originated in the late Carboniferous at the earliest. This research illustrates potential pitfalls for the use of fossils as post hoc age constraints on internal nodes and highlights the importance of explicit phylogenetic analysis of extinct taxa. These results suggest that the application of fossils as minima or maxima on molecular phylogenies should be supplemented or supplanted by combined evidence analyses whenever possible.

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Cited by

Metadata

Authors
Pyron, R. A.
Venue
Systematic Biology
Publisher
Oxford University Press (OUP)
Published
2011-05-03
Volume
60
Issue
4
Pages
466-481
ISSN
  • 1063-5157 (ISSN-L)
  • 1076-836X
DOI
10.1093/sysbio/syr047
OpenAlex
W2167709329
Cited by
413
References
12
FWCI
17.87
Type
journal article
Language
en
Open access
closed

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