Fasciola hepatica: effect of the natural light level on cercarial emergence from temperature-challenged Galba truncatulaPhilippe Vignoles, Amal Titi, Daniel Rondelaud, Abdeslam Mekroud and Gilles DreyfussParasite, 21 (2014) 8DOI: https://doi.org/10.1051/parasite/2014009