Lieu: Brunoy + visio

AbstractInteractions between organisms and their environment impact the evolution of species and have contributed to the extant phenotypic diversity. Extrinsic constraints are diverse, from habitat-related physical constraints to food properties, and usually affect different anatomical structures in tetrapods as the locomotor and feeding apparatuses are separated. Limbless tetrapods, however, must use their head during both feeding and locomotion. Their head undergoes high selective pressures coming from its multi-functionality. Such high selective pressure has constrained the ecological and morphological diversity of most of these clades, except snakes. Snakes are one of the most ecologically and geographically diverse group of tetrapods and is rich of about 4000 species. Diversification in this unique group is associated with a key innovation: their hyper kinetic skull composed of ≈ 26 bones that can move semi-independently. The goal of my research is to understand how the anatomy of the head and skull of snakes may have promoted this diversification despite being a highly integrated system.