Résumé
In recent years, new cryptic mammalian species have been discovered in Europe, many of which belong to the order Chiroptera. Within this order, some species such as Myotis nattereri contain several cryptic lineages/species, especially in the Mediterranean region. Here we present genetic, phylogenetic and morphological analysis on the Myotis nattereri species complex, focusing on France which is thought to be a contact zone for the different lineages/species. We sequenced the full Cytochrome b gene from individuals from 23 localities and investigated diagnostic morphological characteristics. Our results reveal new phylogenetic relationships within the Myotis nattereri species complex and among closely related species. We discuss morphological characters which are synapomorphic to each lineage and can be used to differentiate them. Our results also demonstrate the presence of a new lineage within the Myotis nattereri species complex. This lineage, endemic to Corsica, possibly represents a new cryptic species for which we present preliminary ecological data. We further identify the presence of three lineages/species in France and detail their distribution with potential contact zones.