Constraints on clade ages from fossil outgroups

@inproceedings{Hedman2010ConstraintsOC,
  title={Constraints on clade ages from fossil outgroups},
  author={Matthew M. Hedman},
  booktitle={Paleobiology},
  year={2010}
}
  • M. Hedman
  • Published in Paleobiology 2010
  • Biology
Abstract This paper presents a method for constraining the age of a clade with the ages of the earliest fossil specimens in that clade's outgroups. Given a sufficiently deep, robust, well-resolved, and stratigraphically consistent cladogram, this method can yield useful age constraints even in the absence of specific information about the fossil preservation and recovery rates of individual taxa. The algorithm is applied to simulated data sets to demonstrate that this method can yield robust… Expand
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References

SHOWING 1-10 OF 25 REFERENCES
Using the fossil record to estimate the age of the last common ancestor of extant primates
TLDR
A new statistical method is presented, based on an estimate of species preservation derived from a model of the diversification pattern, that suggests a Cretaceous last common ancestor of primates, approximately 81.5 Myr ago, close to the initial divergence time inferred from molecular data. Expand
Stratigraphic tests of cladistic hypotheses
TLDR
The results caution against evaluating phylogenetic hypotheses of fossil taxa without considering both stratigraphic data and the possible presence of ancestral species, as both factors can affect interpretations of a clade's evolutionary dynamics and its patterns of morphologic evolution. Expand
A Simple Method for Bracketing Absolute Divergence Times on Molecular Phylogenies Using Multiple Fossil Calibration Points
  • C. Marshall
  • Biology, Medicine
  • The American Naturalist
  • 2008
TLDR
A central challenge facing the temporal calibration of molecular phylogenies is finding a quantitative method for estimating maximum age constraints on lineage divergence times and this method, exploiting the fact that the relative branch lengths on the ultrametric tree are proportional to time is provided. Expand
Maximum likelihood estimation of phylogeny using stratigraphic data
TLDR
The method appears to perform well as a tree rooting criterion even when preservation rates are low, and several possible extensions are suggested to address other questions about the nature of fossil preservation and the process of speciation and extinction over time and space. Expand
On fossil preservation and the stratigraphic ranges of taxa
TLDR
Maximum likelihood estimation of mean taxonomic duration, fossil preservation rate, and completeness of the local fossil record under a model in which duration has an exponential distribution and the locations of preserved finds follow a Poisson process is described. Expand
Timing and biogeography of the eutherian radiation: fossils and molecules compared.
TLDR
Fossil evidence supports a Laurasian origin for Eutheria (and Metatheria) and Placentalia, although some molecular studies suggest a Gondwanan origin for both taxa. Expand
Quantitative Analysis of the Timing of the Origin and Diversification of Extant Placental Orders
TLDR
Although the fossil record is incomplete, it appears adequate to reject the hypothesis that orders of placentals began to diversify before the K/T boundary; thus, early Tertiary ordinal diversification is real. Expand
Cretaceous eutherians and Laurasian origin for placental mammals near the K/T boundary
TLDR
The discovery of a new well-preserved mammal from the Late Cretaceous of Mongolia and a broad-scale phylogenetic analysis that includes all well-known CRETaceous fossils and a wide sample of morphology among Tertiary and recent placentals are reported. Expand
Inferring temporal patterns of preservation, origination, and extinction from taxonomic survivorship analysis
TLDR
An approach that can undo distortions and thus permit estimates of true taxonomic rates, while providing estimates of preservation in the process is presented, and preliminary application to data on Paleozoic marine animals suggests that some features of the apparent record can be detected and corrected. Expand
Placental mammal diversification and the Cretaceous–Tertiary boundary
TLDR
The largest available molecular data set for placental mammals is investigated, which includes segments of 19 nuclear and three mitochondrial genes for representatives of all extant placental orders and permits simultaneous constraints from the fossil record and allows rates of molecular evolution to vary on different branches of a phylogenetic tree. Expand
...
1
2
3
...