The bizarre ‘metatherians’ Groeberia and Patagonia, late surviving members of gondwanatherian mammals

@article{Chimento2015TheB,
  title={The bizarre ‘metatherians’ Groeberia and Patagonia, late surviving members of gondwanatherian mammals},
  author={Nicol{\'a}s R. Chimento and Federico L. Agnolin and Fernando Emilio Novas},
  journal={Historical Biology},
  year={2015},
  volume={27},
  pages={603 - 623}
}
Cenozoic mammalian faunas from South America contrast with those of the other continents by the great diversification of metatherian mammals. Among the later, a wide range of morphological disparity have been reported, and several bizarre mammals have been assigned to such clade, based mainly on biogeographical grounds. Outstanding examples of bizarre mammals referred to as Metatheria are the Eocene Groeberia and the Miocene Patagonia. Recent discoveries indicate that South America possessed a… 
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New record of a Mesozoic gondwanatherian mammaliaform from Southern Patagonia.
TLDR
Analysis of the unique combination of characters exhibited by Magallanodon shed doubts on the monophyly of Ferugliotheriidae and suggest that South American taxa may be closely related to each other.
A reassessment of the genus Groeberia Patterson, 1952 (Mammalia, Metatheria): functional and phylogenetic implications
TLDR
A cladistic analysis resulted in the inclusion of Groeberia among australidelphian metatherians, clustering with vombatiform diprotodontians in the strict consensus tree; however, these affinities require further testing.
Marsupials and Other Metatheres of South America
TLDR
The carnivorous sparassodonts evolved the largest metatherian predators known, such as the 600 kg Proborhyaena, as well as the jaguar-sized saber-toothed marsupial Thylacosmilus.
Introduction

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