My PhD work consists of a revision of the evolutionary history of European metatherians (marsupials and related fossils) from the Lower Eocene, a period punctuated by intense climatic warmings. Given this context, the first task is to resolve the systematics of the local marsupial fauna in order to understand its diversity. To this end, I am evaluating the intra- and interspecific variability of the dental morphology of these mammals on the basis of all the ancient and unpublished remains that have been reported. Participation in palaeontological excavations in the South of France allows me to complete the sampling. The reconstruction of the phylogenetic relationships of the given metatherians will lead me to retrace both: i) the palaeobiogeographic scenario of their arrival in Europe, and ii) their evolutionary dynamics between the North and South of this continent. Through this last aspect I am interested in provincialism in response to past climatic changes.