| Species | RefIntense Num | Refseq Num | Source |
|---|---|---|---|
| Holdemania massiliensis | 1 | 8 | MGYG |
| Hungatella effluvii | 1 | 2 | MGYG |
| Hungatella hathewayi | 3 | 25 | HMP/MGYG |
| Hydrogenivirga sp. 128-5-R1-1 | 1 | 1 | HMP |
| Hydrogenobacter thermophilus | 1 | 2 | HMP |
| Hydrogenobaculum sp. SN | 1 | 1 | HMP |
| Hydrogenovibrio crunogenus | 1 | 1 | HMP |
| Hyphomicrobium denitrificans | 1 | 2 | HMP |
| Hyphomonas neptunium | 1 | 1 | HMP |
| Idiomarina baltica | 1 | 1 | HMP |