Abstract
For the families, suborders, and the order of the phototrophic bacteria, legitimate names based on the names of type genera are proposed to replace the illegitimate names used to date. The family names are: Rhodospirillaceae nom. nov., Chromatiaceae Bavendamm 1924, and Chlorobiaceae Copeland 1956; suborder names are: Rhodospirillineae nom. nov. and Chlorobiineae nom. nov.; the order name is Rhodospirillales nom. nov.