{{Short description|Order of bacteria}} {{Automatic taxobox | image = ARS Campylobacter jejuni.jpg | image_caption = ''Campylobacter jejuni'' bacteria | taxon = Campylobacterales | parent_authority = Waite et al. 2017 | authority = Garrity et al. 2006 | subdivision_ranks = Families | subdivision = * Arcobacteraceae * Campylobacteraceae * Helicobacteraceae * Hydrogenimonadaceae * Nitratiruptoraceae * Sulfurimonadaceae * Sulfurospirillaceae * Sulfurovaceae * "Thiobarbaceae" * Thiovulaceae }}
The '''Campylobacterales''' are an order of Campylobacterota which make up the epsilon subdivision, together with the small family Nautiliaceae. They are Gram-negative. Most of the species are microaerophilic.<ref name=Bergey>Garrity, George M.; Brenner, Don J.; Krieg, Noel R.; Staley, James T. (eds.) (2005). Bergey's Manual of Systematic Bacteriology, Volume Two: The Proteobacteria, Part C: The Alpha-, Beta-, Delta-, and Epsilonproteobacteria. New York, New York: Springer. {{ISBN|978-0-387-24145-6}}.</ref>
==Molecular signatures== Comparative genomic analysis has led to the identification of 49 proteins which are uniquely found in virtually all species of the order Campylobacterales. Additionally, two conserved signature indels have been identified which, along with the proteins, serve as molecular markers for the order. The indels are a three-amino-acid insertion in the B protein of the Uvr ABC system, and a two-amino-acid deletion in phenylalanyl-tRNA synthetase.<ref>Gupta, R. S. (2006). Molecular signatures (unique proteins and conserved indels) that are specific for the epsilon proteobacteria. BMC Genomics. 7:167.</ref>
==Phylogeny== The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN)<ref name=LPSN>{{lpsn3|order/campylobacterales|Campylobacterales}}</ref> and National Center for Biotechnology Information (NCBI).<ref name=NCBI>{{cite web |author=Schoch CL |display-authors=et al. |url=https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?command=show&mode=tree&id=213849&lvl=3 |title=Campylobacterales |accessdate=2025-06-05 |publisher=National Center for Biotechnology Information (NCBI) taxonomy database}}</ref>
{| class="wikitable" |- ! colspan=1 | 16S rRNA based LTP_10_2024<ref>{{cite web|title=The LTP |url=https://imedea.uib-csic.es/mmg/ltp/#LTP| access-date=10 December 2024}}</ref><ref>{{cite web|title=LTP_all tree in newick format| url=https://imedea.uib-csic.es/mmg/ltp/wp-content/uploads/ltp/LTP_all_10_2024.ntree |access-date=10 December 2024}}</ref><ref>{{cite web|title=LTP_10_2024 Release Notes| url=https://imedea.uib-csic.es/mmg/ltp/wp-content/uploads/ltp/LTP_10_2024_release_notes.pdf |access-date=10 December 2024}}</ref> ! colspan=1 | 120 marker proteins based GTDB 10-RS226<ref name="about">{{cite web |title=GTDB release 10-RS226 |url=https://gtdb.ecogenomic.org/about#4%7C |website=Genome Taxonomy Database|access-date=1 May 2025}}</ref><ref name="tree_bac">{{cite web |title=bac120_r226.sp_label |url=https://data.gtdb.ecogenomic.org/releases/release226/226.0/auxillary_files/bac120_r226.sp_labels.tree |website=Genome Taxonomy Database|access-date=1 May 2025}}</ref><ref name="taxon_history">{{cite web |title=Taxon History |url=https://gtdb.ecogenomic.org/taxon_history/ |website=Genome Taxonomy Database|access-date=1 May 2025}}</ref> |- | style="vertical-align:top| {{Clade | style=font-size:90%;line-height:90% |1={{clade |1={{clade |label1=Nitratiruptoraceae |1={{clade |1=''Nitratiruptor'' |2=''Nitrosophilus'' }} }} |2={{clade |1={{clade |label1=Hydrogenimonadaceae |1=''Hydrogenimonas'' }} |2={{clade |1={{clade |label1=Thioreductoraceae |1=''Thioreductor'' }} |2={{clade |1={{clade |label1=Helicobacteraceae |1={{clade |1=''Wolinella'' |2=''Helicobacter'' [incl. "''Pseudohelicobacter''"] }} }} |2={{clade |1={{clade |label1=Sulfurovaceae |1={{clade |1=''Nitratifractor'' |2=''Sulfurovum'' }} |label2=Sulfurimonadaceae |2={{clade |1=''Sulfuricurvum'' |2=''Sulfurimonas'' }} }} |2={{clade |1={{clade |label1=Sulfurospirillaceae |1=''Sulfurospirillum'' }} |2={{clade |label1=Campylobacteraceae |1=''Campylobacter'' |label2=Arcobacteraceae |2={{clade |1=''Poseidonibacter'' |2={{clade |1=''Malaciobacter'' |2={{clade |1=''Arcobacter'' |2={{clade |1=''Aliarcobacter'' species-group 2 |2={{clade |1=''Halarcobacter'' |2=''Aliarcobacter'' }} }} }} }} }} }} }} }} }} }} }} }} }} | {{Clade|style=font-size:90%; line-height:90% |1={{clade |1={{clade |1={{clade |label1=Thiovulaceae |1=''Thiovulum'' |label2=Sulfurimonadaceae |2={{clade |1=''Sulfuricurvum'' |2=''Sulfurimonas'' }} }} |2={{clade |1={{clade |label1=Nitratiruptoraceae |1={{clade |1=''Nitrosophilus alvini'' |2={{clade |1=''Nitrosophilus''_A |2=''Nitratiruptor'' }} }} }} |2={{clade |label1=Hydrogenimonadaceae |1=''Hydrogenimonas'' |label2=Sulfurovaceae |2={{clade |1=''Nitratifractor'' |2=''Sulfurovum'' }} }} }} }} |2={{clade |1={{clade |label1=Helicobacteraceae |1={{clade |1={{clade |1=''Wolinella'' |2="''Pseudohelicobacter''" }} |2=''Helicobacter'' }} }} |2={{clade |1={{clade |label1=Arcobacteraceae |1={{clade |1="''Ca.'' Marinarcus" |2={{clade |1=''Malaciobacter'' |2={{clade |1=''Arcobacter'' |2={{clade |1=''Halarcobacter'' |2={{clade |1={{clade |1=''Arcobacter roscoffensis'' |2=''Poseidonibacter'' }} |2={{clade |1=''Malaciobacter pacificus'' |2=''Aliarcobacter'' }} }} }} }} }} }} }} |2={{clade |1={{clade |label1=Sulfurospirillaceae |1=''Sulfurospirillum'' }} |2={{clade |label1=UBA1877 |1=''Sulfurospirillum''_B |label2=Campylobacteraceae |2=''Campylobacter'' }} }} }} }} }} }} |} Unassigned genera: * "''Flexispira''" <small>Bryner 1987</small> * "''Candidatus'' Thioturbo" <small>Muyzer et al. 2005</small> * "''Thiofractor''" <small>Makita et al. 2012</small> * "Thiobarbaceae" <small>Assié et al. 2020</small> ** "''Candidatus'' Thiobarba" <small>Assié et al. 2020</small>
== See also == * List of bacterial orders * List of bacteria genera
==References== {{Reflist}}
{{Bacteria classification}} {{Taxonbar|from=Q138238}} Category:Campylobacterota {{Campylobacterota-stub}}