| Order | Family | Genus | Species |
|---|---|---|---|
| Acetobacterales | 4 | 66 | 1731 |
| Azospirillales | 0 | 0 | 2 |
| Candidatus Pelagibacterales | 1 | 5 | 587 |
| Candidatus Puniceispirillales | 3 | 4 | 57 |
| Caulobacterales | 1 | 10 | 2629 |
| Dongiales | 0 | 0 | 1 |
| Elsterales | 1 | 0 | 11 |
| Emcibacterales | 2 | 5 | 18 |
| Ferrovibrionales | 1 | 0 | 1 |
| Futianiales | 1 | 1 | 1 |
| Geminicoccales | 1 | 10 | 69 |
| Holosporales | 4 | 21 | 84 |
| Hyphomicrobiales | 46 | 235 | 36172 |
| Hyphomonadales | 1 | 8 | 234 |
| Iodidimonadales | 1 | 1 | 10 |
| Kopriimonadales | 1 | 0 | 2 |
| Kordiimonadales | 2 | 6 | 46 |
| Maricaulales | 2 | 15 | 156 |
| Micropepsales | 1 | 2 | 19 |
| Minwuiales | 1 | 1 | 9 |
| Parvibaculales | 0 | 0 | 1 |
| Parvularculales | 1 | 4 | 39 |
| Radicibacterales | 1 | 1 | 1 |
| Reyranellales | 0 | 0 | 1 |
| Rhodobacterales | 3 | 258 | 8350 |
| Rhodospirillales | 20 | 78 | 1672 |
| Rhodothalassiales | 1 | 1 | 12 |
| Rickettsiales | 5 | 45 | 5979 |
| Sneathiellales | 1 | 3 | 28 |
| Sphingomonadales | 13 | 75 | 8843 |
| Thalassobaculales | 0 | 0 | 2 |