| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Xiheicaenibacterium | ||||
| Xiheicaenibacterium phototrophicum Ts | ||||
| Xiheicaenimonas | ||||
| Xiheicaenimonas phototrophica Ts | ||||
| Xiheilimnobacterium | ||||
| Xiheilimnobacterium phototrophicum Ts | ||||
| Xiheimicrobium | ||||
| Xiheimicrobium aquaticum Ts | ||||
| Xinfangfangia | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Xinfangfangia humi | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Xinfangfangia pollutisoli | Unknown | Valid (ICNP) | Excubia bot about 2 years ago | |
| Xinfangfangia soli T | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Xuhuaishuia | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Xuhuaishuia manganoxidans T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Xylanibacillus | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Xylanibacillus composti T | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Xylanibacter | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Xylanibacter brevis | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Xylanibacter caecicola | Unknown | Valid (ICNP) | Excubia bot about 2 years ago | |
| Xylanibacter muris | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Xylanibacter oryzae T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Xylanibacter rara | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Xylanibacter rarus | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Xylanibacter rodentium | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Xylanibacter ruminicola | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Xylanibacterium | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Xylanibacterium ulmi T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Xylanimicrobium | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Xylanimicrobium pachnodae T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Xylanimonas | Unknown | Valid (ICNP) | Excubia bot over 4 years ago |