Emended description of the genus Methylophaga Janvier et al. 1985.

The genus Methylophaga Janvier et al. 1985 comprises eight species with validly published names at the time of writing. The original description of the genus was published over 26 years ago and was based on only two species, namely Methylophaga marina and Methylophaga thalassica - as such, the description of the genus requires updating to take into account the other six known species. Based on literature concerning the eight species of Methylophaga published over the last 26 years, an emended description of the genus is presented, taking into account properties of all members of the species with validly published names.