A Middle Jurassic mammal from Madagascar

@article{Flynn1999AMJ,
  title={A Middle Jurassic mammal from Madagascar},
  author={John J. Flynn and J. Michael Parrish and Berthe Rakotosamimanana and William F Simpson and Andr{\'e} R. Wyss},
  journal={Nature},
  year={1999},
  volume={401},
  pages={57-60}
}
The lower molars of tribosphenic mammals (marsupials, placentals and their extinct allies) are marked, primitively, by a basined heel (talonid) acting as the mortar to the pestle of a large inner cusp (protocone) on the opposing upper teeth. Here we report the earliest tribosphenic mammal found so far, three lower teeth in a jaw fragment from Middle Jurassic (Bathonian, ∼167 ± 2 Myr) sediments of northwest Madagascar. This specimen extends the stratigraphic range of the Tribosphenida by some 25… 
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References

SHOWING 1-10 OF 17 REFERENCES
Implications of Deltatheridium specimens for early marsupial history
TLDR
The presence of specialized marsupial patterns of tooth replacement and cranial vascularization in Deltatheridium and the basal phylogenetic position of this taxon indicate that these features are characteristic of Metatheria as a whole.
Cosmopolitanism among Gondwanan Late Cretaceous mammals
TLDR
The occurrence of a highly specialized and distinctive group of extinct mammals, the Sudamericidae (Gondwanatheria), in the Late Cretaceous of Madagascar and India is reported, which is the first evidence of gondwanatheres outside South America and the first indication of cosmopolitanism among Late CRETaceous Gondwanan mammals.
Theria of Metatherian-Eutherian Grade and the Origin of Marsupials
TLDR
The hypothesized relationships among Cretaceous marsupials, together with meager negative evidence from the fossil record of South America, support a North American origin for the Tribosphenida and no diagnostic dental specialization for Marsupialia is known.
A tribosphenic mammal from the Mesozoic of Australia.
A small, well-preserved dentary of a tribosphenic mammal with the most posterior premolar and all three molars in place has been found in Aptian (Early Cretaceous) rocks of southeastern Australia. In
Molar Structure and Function in the Early Cretaceous Mammal Pappotherium: Evolutionary Implications for Mesozoic Theria
Aspects of structural and functional features of molar dentitions in Mesozoic Theria are interpreted in relation to recently discovered mammalian taxa of primitive tribosphenic grade. Single-rank,
The Beginning of the age of dinosaurs : faunal change across the Triassic-Jurassic boundary
Preface Introduction Part I. The Beginning of the Age of Dinosaurs: The Time and the Setting: 1. Historical aspects of the Triassic-Jurassic boundary problem Edwin H. Colbert 2. Fossil plants and the
Definition, diagnosis, and origin of Mammalia
TLDR
Triassic and Early Jurassic taxa commonly referred to as mammals, including Morganucodontidae, Kuehneotheriidae, and Haramiyidae, were found to lie outside of Mammalia.
A mammalian petrosal from the early Cretaceous of Mongolia : implications for the evolution of the ear region and mammaliamorph interrelationships. American Museum novitates ; no.3149
TLDR
A mammalian petrosal from the Early Cretaceous Khoobur locality, Guchin Us Somon, Mongolia, is described and the major vessels and nerves associated with it are restored and a cladistic analysis identified nine equally parsimonious trees.
Mesozoic differentiation, multituberculates, monotremes, early therians, and marsupials
TLDR
This is a comprehensive analysis of the evidence for the Mesozoic origin and differentiation of mammals, particularly the multituberculates, monotremes and therians, and offers new research on mammalian evolution which occurred during the Age of Reptiles.
Toward a Phylogenetic Classification of the Mammalia
Periodically it is worthwhile to assess our knowledge and understanding of mammalian phylogeny and one of its expressions, classification. This short paper is yet another attempt to do so, taking
...
1
2
...