| Order | Family | Genus | Species |
|---|---|---|---|
| Acetobacterales | 4 | 66 | 1639 |
| Azospirillales | 0 | 0 | 2 |
| Candidatus Pelagibacterales | 1 | 5 | 517 |
| Candidatus Puniceispirillales | 2 | 2 | 13 |
| Caulobacterales | 1 | 10 | 2524 |
| 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 | 80 |
| Hyphomicrobiales | 46 | 212 | 34976 |
| Hyphomonadales | 1 | 8 | 229 |
| Iodidimonadales | 1 | 1 | 9 |
| Kopriimonadales | 1 | 0 | 2 |
| Kordiimonadales | 2 | 6 | 40 |
| Maricaulales | 2 | 14 | 148 |
| Micropepsales | 1 | 2 | 19 |
| Minwuiales | 1 | 1 | 9 |
| Parvibaculales | 0 | 0 | 1 |
| Parvularculales | 1 | 4 | 38 |
| Reyranellales | 0 | 0 | 1 |
| Rhodobacterales | 3 | 247 | 7601 |
| Rhodospirillales | 19 | 76 | 1610 |
| Rhodothalassiales | 1 | 1 | 12 |
| Rickettsiales | 5 | 44 | 5770 |
| Sneathiellales | 1 | 3 | 27 |
| Sphingomonadales | 7 | 68 | 7912 |
| Thalassobaculales | 0 | 0 | 2 |