| Order | Family | Genus | Species |
|---|---|---|---|
| Acetobacterales | 4 | 66 | 1637 |
| Azospirillales | 0 | 0 | 2 |
| Candidatus Pelagibacterales | 1 | 5 | 493 |
| Candidatus Puniceispirillales | 2 | 2 | 13 |
| Caulobacterales | 1 | 10 | 2522 |
| Dongiales | 0 | 0 | 1 |
| Elsterales | 1 | 0 | 10 |
| Emcibacterales | 2 | 5 | 13 |
| Ferrovibrionales | 1 | 0 | 1 |
| Futianiales | 1 | 1 | 1 |
| Geminicoccales | 1 | 9 | 67 |
| Holosporales | 4 | 21 | 79 |
| Hyphomicrobiales | 46 | 209 | 34906 |
| Hyphomonadales | 1 | 8 | 228 |
| Iodidimonadales | 1 | 1 | 9 |
| Kopriimonadales | 1 | 1 | 6 |
| Kordiimonadales | 2 | 6 | 40 |
| Maricaulales | 2 | 14 | 146 |
| Micropepsales | 1 | 2 | 19 |
| Minwuiales | 1 | 1 | 9 |
| Parvibaculales | 0 | 0 | 1 |
| Parvularculales | 1 | 5 | 39 |
| Reyranellales | 0 | 0 | 1 |
| Rhodobacterales | 3 | 248 | 7556 |
| Rhodospirillales | 19 | 74 | 1600 |
| Rhodothalassiales | 1 | 1 | 12 |
| Rickettsiales | 4 | 43 | 5726 |
| Sneathiellales | 1 | 3 | 27 |
| Sphingomonadales | 4 | 62 | 7877 |
| Thalassobaculales | 0 | 0 | 1 |