Claim: Louis Euzet created the concept of alloxenic speciation, i.e. the speciation of parasites linked with the behaviour and ecology of the host, and most of his scientific work was devoted to the Mediterranean.
Evidence: Louis Euzet created the concept of alloxenic speciation, i.e. the speciation of parasites linked with the behaviour and ecology of the host, and was one of the first to propose schemes of coevolution between monogeneans and elasmobranchs. Most of Louis Euzet's scientific work was devoted to the Mediterranean, but he also worked on parasites from almost all of the world's seas.