| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Yersinia occitanica | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Yersinia kristensenii subsp. rochesterensis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Yaniella fodinae | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Yania | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Yania halotolerans | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Yania flava | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Yangia | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Yangia pacifica | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Yangia mangrovi | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Xylanimicrobium | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Xylanimicrobium pachnodae | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Xylanibacterium | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Xylanibacterium ulmi | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Xylanibacter ruminicola | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Xylanibacter rodentium | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Xylanibacter rarus | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Xylanibacter rara | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Xylanibacter oryzae | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Xylanibacter muris | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Xylanibacter brevis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Xuhuaishuia | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Xuhuaishuia manganoxidans | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Xiangella | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Xiangella phaseoli | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Xiamenia | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Xiamenia xianingshaonis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Xenorhabdus nematophilus | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Xenorhabdus nematophilus subsp. poinarii | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Xenorhabdus nematophilus subsp. nematophilus | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Xenorhabdus nematophilus subsp. bovienii | Unknown | Valid (ICNP) | Excubia bot over 1 year ago |