| Part - I Phototrophic Bacteria |
| Order I Rhodospirillales |
| Suborder: Rhodospirllineae |
| Family I Rhodospirillacea |
| Genus I Rhodospirillum |
| Genus II Rhodospeudomonas |
| Genus III Rhodospeudomonas |
| Family II Chromatiaceae |
| Genus I Chromatium |
| Genus II Thiocystis |
| Genlls III Thiosarcina |
| Genus IV Thiospirilum |
| Genus V Thiocapsa |
| Genus- VI Lamprocystis |
| Genus VII Thi odicatyon |
| Genus VIII Thiopedia |
| Genus IX Amoetobacter |
| Genus X Ectothiorhodospira |
| Suborder: Chlorobineae |
| Family III Chlorobiaceae |
| Genus I Clorobium |
| Genus II Prosthecochloris |
| Genlls III Chloroseudomonas |
| Genus IV Pelodictyon |
| Genus V Clathrochloris |
| Addenda |
| Genus: Chlorochromatium |
| Genus: Cylindrogloea |
| Genus: Chlorobacterium |