Mesagrion leucorrhinum is a species of damselfly. Its monotypic genus Mesagrion was formerly in the subfamily Argiolestinae of the flatwing damselfly family (Megapodagrionidae). As a result of molecular phylogenetic studies by Bybee et al. in 2021, it is now in its own family, Mesagrionidae.[1]
Mesagrion leucorrhinum is endemic to Colombia. Its natural habitats are subtropical or tropical moist montane forests and rivers. It is threatened by habitat loss.