| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Yania halotolerans T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Yania flava | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Yangia | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Yangia pacifica T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Yangia mangrovi | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xylanimicrobium | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xylanimicrobium pachnodae T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xylanibacterium | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xylanibacterium ulmi T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xylanibacter ruminicola | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xylanibacter rodentium | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xylanibacter rarus | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xylanibacter rara | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xylanibacter oryzae T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xylanibacter muris | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xylanibacter brevis | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xuhuaishuia | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xuhuaishuia manganoxidans T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xiangella | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xiangella phaseoli T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xiamenia | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xiamenia xianingshaonis T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xenorhabdus nematophilus | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xenorhabdus nematophilus subsp. poinarii | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xenorhabdus nematophilus subsp. nematophilus | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xenorhabdus nematophilus subsp. bovienii | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xenorhabdus nematophilus subsp. bovenii | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xenorhabdus nematophilus subsp. beddingii | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xenorhabdus nematophila subsp. poinarii | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Xenorhabdus nematophila subsp. nematophila | Unknown | Valid (ICNP) | Excubia bot over 3 years ago |