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Journal of Mammalian Evolution

, Volume 21, Issue 3, pp 271–284 | Cite as

Were There Miocene Meridiolestidans? Assessing the Phylogenetic Placement of Necrolestes patagonensis and the Presence of a 40 Million Year Meridiolestidan Ghost Lineage

  • Rachel N. O’Meara
  • Richard S. Thompson
Original Paper

Abstract

The enigmatic mammal Necrolestes patagonensis from the Miocene of Patagonia possesses a highly apomorphic osteological form that has confounded phylogenetic interpretation for over a century. In this time it has been affiliated with both eutherians and metatherians; however, a recent study by Rougier et al. (Proc Natl Acad Sci USA 109:19871–19872, 2012) raises the intriguing possibility that Necrolestes is a relictual member of a clade of South American non-therian dryolestoids, the Meridiolestida. This group is known chiefly from the Cretaceous of South America and assignment of Necrolestes to Meridiolestida implies a ghost lineage of about 40 million years. Such a lengthy ghost lineage requires strong evidence, which minimizes potentially circular assumptions of anatomical homology. Here, we vary the coding of cusp homologies in Necrolestes, previously assumed to diverge from the metatherian pattern, and add zalambdodont and incipiently zalambdodont metatherian taxa to the analyses, in order to assess the effects of non-independent characters and taxon sampling on the original topology. The results of both maximum parsimony and Bayesian analysis using the Mk model show that these possible sources of bias have little effect on the topology and ultimately increase confidence in the placement of Necrolestes in Meridiolestida and its concomitant 40 million year ghost lineage. Additionally, our Bayesian analysis resolves Australosphenida in a trichotomy with Peramus and Vincelestes + Boreosphenida. This contrasts with the majority of existing topologies, and raises interesting questions regarding both the evolution of tribospheny and the use of the Mk model with paleontological datasets.

Keywords

Necrolestes Meridiolestida Zalambdodonty Australosphenida Bayesian analysis Homology 

Notes

Acknowledgments

We would like to thank Robin Beck and one anonymous reviewer for their detailed comments and critique, which greatly improved both the analyses and content of our study. Thanks go to Dr. Robert Asher for providing the premise for this study, his many useful comments on the manuscript, as well as his support and encouragement throughout the project. Matt Lowe and the staff at the University Museum of Zoology, Cambridge provided support and access to specimens of Notoryctes. We also thank Nicola Heckeberg for support and assistance during data analyses, as well as Martin R. Smith for inspiring and assisting with the Bayes Factor analyses. RO’s work is funded by the Cambridge Home and EU Scholarship Scheme (CHESS).

Supplementary material

10914_2013_9252_MOESM1_ESM.docx (89 kb)
ESM 1 (DOCX 88 kb)
10914_2013_9252_MOESM2_ESM.txt (27 kb)
OMeara_and_Thompson_matrix (TXT 26 kb)

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  1. 1.The University Museum of ZoologyCambridgeUK

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