Fidelibacter

{{Short description|Genus of incertae sedis bacterium}}{{Speciesbox

| greatgreatgrandparent_authority = Katayama et al. 2024

| greatgrandparent_authority = Katayama et al. 2024

| grandparent_authority = Katayama et al. 2024

| parent_authority = Katayama et al. 2024

| genus = Fidelibacter

| species = multiformis

| authority = Katayama et al. 2024

}}

Fidelibacter is a monotypic genus of incertae sedis bacteria. It contains one species, Fidelibacter multiformis. It is in the monotypic family Fidelibacteraceae, monotypic order Fidelibacterales, monotypic class Fidelibacteria and monotypic phylum Fidelibacterota.{{Cite journal |last=Katayama |first=Taiki |last2=Nobu |first2=Masaru K. |last3=Kamagata |first3=Yoichi |last4=Tamaki |first4=Hideyuki |date=2024 |title=Fidelibacter multiformis gen. nov., sp. nov., isolated from a deep subsurface aquifer and proposal of Fidelibacterota phyl. nov., formerly called Marine Group A, SAR406 or Candidatus Marinimicrobia |url=https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/ijsem.0.006558 |journal=International Journal of Systematic and Evolutionary Microbiology |volume=74 |issue=10 |pages=006558 |doi=10.1099/ijsem.0.006558 |issn=1466-5034 |pmc=11652737 |pmid=39465541}} Fidelibacterota is one of the two valid bacterial phyla that does not belong to any kingdom, the other being Vulcanimicrobiota.Parte, A.C., Sardà Carbasse, J., Meier-Kolthoff, J.P., Reimer, L.C. and Göker, M. (2020). [https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/ijsem.0.004332 List of Prokaryotic names with Standing in Nomenclature (LPSN) moves to the DSMZ]. International Journal of Systematic and Evolutionary Microbiology, 70, 5607-5612; DOI: 10.1099/ijsem.0.004332