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A bizarre new family of Marsupialia (Incertae Sedis) from the early Pliocene of northeastern Australia: Implications for the phylogeny of bunodont marsupials

Published online by Cambridge University Press:  14 July 2015

Robin M. D. Beck ,
Michael Archer ,
Henk Godthelp ,
Brian S. Mackness ,
Suzanne J. Hand  and
Jeannette Muirhead
Robin M. D. Beck
Affiliation:
School of Biological, Earth and Environmental Sciences, University of New South Wales, NSW 2052, Australia,
Michael Archer
Affiliation:
School of Biological, Earth and Environmental Sciences, University of New South Wales, NSW 2052, Australia,
Henk Godthelp
Affiliation:
School of Biological, Earth and Environmental Sciences, University of New South Wales, NSW 2052, Australia,
Brian S. Mackness
Affiliation:
School of Biological, Earth and Environmental Sciences, University of New South Wales, NSW 2052, Australia,
Suzanne J. Hand
Affiliation:
School of Biological, Earth and Environmental Sciences, University of New South Wales, NSW 2052, Australia,
Jeannette Muirhead
Affiliation:
School of Biological, Earth and Environmental Sciences, University of New South Wales, NSW 2052, Australia,
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Abstract

We describe Numbigilga ernielundeliusi new genus and species, a highly unusual marsupial represented by a partial right mandible with p2-m4 and a left upper molar from early Pliocene deposits at Bluff Downs, Queensland, northeastern Australia. Numbigilga n. gen. is characterized by a bunodont dentition with a number of striking specializations, and we refer it to Numbigilgidae new family. This taxon shares a range of dental apomorphies with various bunodont marsupial groups from the Late Cretaceous of North America and Paleogene of Gondwana. However, many of these features are most likely highly homoplastic within marsupials, reflecting convergent adaptations to a frugivorous-omnivorous diet. Other dental characters suggest possible affinities to the Australian order Peramelemorphia (bandicoots). Alternatively, Numbigilga may be a representative of an entirely new order of Australian marsupials. in the absence of more nearly complete specimens that might clarify its relationships, we refer Numbigilga to Marsupialia incertae sedis. We consider the distributions of a number of dental characters in bunodont marsupials and argue that no North American Late Cretaceous taxa can be convincingly referred to the order Polydolopimorphia. Thus, polydolopimorphians continue to be known only from the Cenozoic of Gondwana, with no fossil evidence that their initial divergences occurred in North America.

Type
Research Article
Information
Journal of Paleontology , Volume 82 , Issue 4 , July 2008 , pp. 749 - 762
Copyright
Copyright © The Paleontological Society 

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