Impacts of the Cretaceous Terrestrial Revolution and KPg Extinction on Mammal Diversification

  title={Impacts of the Cretaceous Terrestrial Revolution and KPg Extinction on Mammal Diversification},
  author={R Meredith and Jan E. Janecka and John Gatesy and Oliver A. Ryder and Colleen Anne Fisher and Emma C. Teeling and Alisha M. Goodbla and Eduardo Eizirik and Taiz L. L. Sim{\~a}o and Tanja Stadler and Daniel L. Rabosky and Rodney L. Honeycutt and John J. Flynn and Colleen M Ingram and Cynthia C. Steiner and Tiffani L. Williams and T J Robinson and Angela Burk-Herrick and Michael Westerman and Nadia A. Ayoub and Mark S. Springer and William J. Murphy},
  pages={521 - 524}
Previous analyses of relations, divergence times, and diversification patterns among extant mammalian families have relied on supertree methods and local molecular clocks. [] Key Method We constructed a molecular supermatrix for mammalian families and analyzed these data with likelihood-based methods and relaxed molecular clocks. Phylogenetic analyses resulted in a robust phylogeny with better resolution than phylogenies from supertree methods. Relaxed clock analyses support the long-fuse model of…
Evolutionary Models for the Diversification of Placental Mammals Across the KPg Boundary
The strengths and weaknesses of different timetree methods that may now be applied to estimate the timing of the placental radiation are examined and the complexities of timetree estimation when the signal of speciation times is impacted by incomplete lineage sorting (ILS) and hybridization.
Macroevolutionary Dynamics and Historical Biogeography of Primate Diversification Inferred from a Species Supermatrix
A robust molecular phylogeny for 70 primate genera and 367 primate species is generated based on a concatenation of 69 nuclear gene segments and ten mitochondrial gene sequences, most of which were extracted from GenBank to find support for the hypothesis that the most recent common ancestor of living Primates resided in Asia.
Bayesian molecular clock dating and the divergence times of angiosperms and primates
This analysis demonstrates that even though many sources of uncertainty are explored, attempts to control for these factors still do not bring clock estimates and earliest confident fossil occurrences into agreement, highlighting that more room for improvement might lie in refining the knowledge and use of fossil calibrations, the resulting improvements to molecular estimates of timescales will lead to a better understanding of angiosperm evolution.
Phylogenetic evidence for mid-Cenozoic turnover of a diverse continental biota
Molecular phylogenetic data is used to show mid-Cenozoic restructuring of Australia’s lizards and snakes and indicates that the temporal clustering of major radiation ages in Gondwanan endemic lineages and immigration into Australia is narrower than expected under time-continuous models assuming no overarching external perturbation.
Adaptive radiation of multituberculate mammals before the extinction of dinosaurs
It is shown that in arguably the most evolutionarily successful clade of Mesozoic mammals, the Multituberculata, an adaptive radiation began at least 20 million years before the extinction of non-avian dinosaurs and continued across the Cretaceous–Paleogene boundary.
Molecular and Paleontological Evidence for a Post-Cretaceous Origin of Rodents
This study demonstrates that, with reliable fossil constraints, the incompatibility between paleontological and molecular estimates of rodent divergence times can be eliminated using currently available tools and genetic markers.
A glimpse on the pattern of rodent diversification: a phylogenetic approach
The results show that rodents experienced shifts in diversification rate regularly through the Tertiary, but at different periods for each clade, and suggest that extinction led to the loss of diversification signal for most of the Paleogene nodes.
Beyond fossil calibrations: realities of molecular clock practices in evolutionary biology
This critique should serve as a call to action for researchers across multiple communities, particularly those working on clades for which fossil records are poor, to develop their own guidelines regarding selection and implementation of alternative calibration types.
Fossil and phylogenetic analyses reveal recurrent periods of diversification and extinction in dictyopteran insects.
This study examines whether the cockroaches, mantises and termites (altogether included in Dictyoptera) have experienced episodic pulses of speciation or extinction and how these pulses may be associated with environmental fluctuations or mass extinctions.
Ecological causes of uneven diversification and richness in the mammal tree of life
This work develops a new phylogeny of nearly all ~6000 species using a 31-gene supermatrix and fossil node- and tip-dating approaches to establish a robust evolutionary timescale for mammals and finds a deeper-time association where clades of high-latitude species have the highest speciation rates, suggesting that species durations are shorter outside than inside the tropics.


Placental mammal diversification and the Cretaceous–Tertiary boundary
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.
The delayed rise of present-day mammals
The results show that the phylogenetic ‘fuses’ leading to the explosion of extant placental orders are not only very much longer than suspected previously, but also challenge the hypothesis that the end-Cretaceous mass extinction event had a major, direct influence on the diversification of today’s mammals.
Mammalian phylogeny reveals recent diversification rate shifts
  • T. Stadler
  • Biology, Environmental Science
    Proceedings of the National Academy of Sciences
  • 2011
Investigation of mammalian subgroups (marsupials, placentals, and the six largest placental subgroups) reveals that the diversification rate peak at 33–30 Mya is mainly driven by rodents, cetartiodactyla, and marsupials.
Continental breakup and the ordinal diversification of birds and mammals
THE classical hypothesis for the diversification of birds and mammals proposes that most of the orders diverged rapidly in adaptive radiations after the Cretaceous/Tertiary (K/T) extinction event 65
Retroposon analysis and recent geological data suggest near-simultaneous divergence of the three superorders of mammals
It is proposed that near-simultaneous divisions of continents leading to isolated Africa, South America, and Laurasia caused nearly concomitant divergence of the ancient placental ancestor into 3 lineages, Afrotheria, Xenarthra, and Boreotheria, ≈120 Ma.
Quantitative Analysis of the Timing of the Origin and Diversification of Extant Placental Orders
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.
Using genomic data to unravel the root of the placental mammal phylogeny.
The genome sequence assemblies of human, armadillo, elephant, and opossum are analyzed to identify informative coding indels that would serve as rare genomic changes to infer early events in placental mammal phylogeny and suggest Afrotheria and Xenarthra diverged from other placental mammals approximately 103 (95-114) million years ago.
Endemic African mammals shake the phylogenetic tree
DNA sequences from three mitochondrial genes and two nuclear genes are analysed to examine relationships of insectivores to other mammals and suggest that there was an extensive African radiation from a single common ancestor that gave rise to ecologically divergent adaptive types.
Cretaceous eutherians and Laurasian origin for placental mammals near the K/T boundary
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.
The origins of modern biodiversity on land
  • M. Benton
  • Environmental Science
    Philosophical Transactions of the Royal Society B: Biological Sciences
  • 2010
A case is made here that this approach may be less successful at representing the shape of the evolution of life than the phylogenetic expansion approach, and new methods in phylogenetic analysis, morphometrics and the study of exceptional biotas allow new approaches.