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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.
Phylogeny and divergence of the pinnipeds (Carnivora: Mammalia) assessed using a multigene dataset
A dated molecular supertree for all 34 world pinniped species derived from a weighted matrix representation with parsimony (MRP) supertree analysis of 50 gene trees, each determined under a maximum likelihood (ML) framework is presented.
A Dated Phylogeny of Marsupials Using a Molecular Supermatrix and Multiple Fossil Constraints
- R. Beck
- 19 February 2008
An analysis of “unrepresented basal branch lengths” suggests that the fossil record is particularly poor for didelphids and most groups within the Australasian radiation.
Ancient dates or accelerated rates? Morphological clocks and the antiquity of placental mammals
The large discrepancies between clock- and fossil-based estimates for divergence dates might be attributable to relatively small changes in evolutionary rates through time, although other explanations need to be investigated.
Australia's Oldest Marsupial Fossils and their Biogeographical Implications
Djarthia is the oldest known crown-group marsupial anywhere in the world that is represented by dental, cranial and post-cranial remains, and is also the most plesiomorphic known australidelphian, and phylogenetic analyses place it outside all other Australian marsupials.
Miocene mammal reveals a Mesozoic ghost lineage on insular New Zealand, southwest Pacific
- T. Worthy, A. Tennyson, R. Beck
- GeologyProceedings of the National Academy of Sciences
- 19 December 2006
Its presence in NZ in the Middle Miocene and apparent absence from Australia and other adjacent landmasses at this time appear to reflect a Gondwanan vicariant event and imply persistence of emergent land during the Oligocene marine transgression of NZ.
A higher-level MRP supertree of placental mammals
- R. Beck, O. R. Bininda‐Emonds, M. Cardillo, Fu-Guo Robert Liu, A. Purvis
- BiologyBMC Evolutionary Biology
- 13 November 2006
The supertree is the first phylogeny to include all 113 extant families without making a priori assumptions of suprafamilial monophyly, and supports the idea that biogeography has played a crucial role in the evolution of placental mammals.
Current status of species-level representation in faunas from selected fossil localities in the Riversleigh World Heritage Area, northwestern Queensland
Current lists of species-level representation in faunas from 80 Cenozoic fossil localities at the Riversleigh World Heritage Area have been compiled by review of recorded occurrences of taxa obtained…
The Miocene mammal Necrolestes demonstrates the survival of a Mesozoic nontherian lineage into the late Cenozoic of South America
- G. Rougier, J. Wible, R. Beck, S. Apesteguía
- Geography, Environmental ScienceProceedings of the National Academy of Sciences
- 19 November 2012
It is concluded that Necrolestes is a remnant of the highly endemic Mesozoic fauna of nontribosphenic mammals in SA and is a late-surviving member of the recently recognized nontherian clade Meridiolestida, which is currently known only from SA.
An ‘ameridelphian’ marsupial from the early Eocene of Australia supports a complex model of Southern Hemisphere marsupial biogeography
- R. Beck
- Geography, Environmental ScienceNaturwissenschaften
- 5 August 2012
An isolated ankle bone of a metatherian from the early Eocene Tingamarra Local Fauna in northeastern Australia is described and compared with a range of marsupials and stem-metatherians strongly suggest that the absence of the CLAJP in QM F30060 is plesiomorphic, and that this specimen represents the first unequivocal non-australidelPHian (‘ameridelphian’) meetatherian known from Australia.