| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Symbiotes lectularia | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Symbiopectobacterium | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Symbiopectobacterium purcellii T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Sutcliffiella rhizosphaerae | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Sutcliffiella deserti | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Suonthocola | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Suonthocola fibrivorans T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Sulfurospirillum diekertiae | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Sulfurococcus | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Sulfurococcus yellowstonii | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Sulfurococcus yellowstonensis | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Sulfurococcus mirabilis T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Sulfurimonas marina | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Sulfuriferula plumbophilus | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Sulfolobus tokodaii | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Sulfolobus solfataricus | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Sulfolobus shibatae | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Sulfolobus metallicus | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Sulfolobus hakonensis | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Sulfolobus brierleyi | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Sulfobacillus disulfidooxidans | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Sulfitobacter algicola | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Suipraoptans | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Suipraoptans intestinalis T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Suilimivivens | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Suilimivivens aceti T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Succinivibrio faecicola | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Subtercola pratensis | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Stygiolobus caldivivus | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Stutzerimonas | Unknown | Valid (ICNP) | Excubia bot over 3 years ago |