Spirochaetaceae Swellengrebel 1907 (Approved Lists 1980) emend. Hördt et al. 2020

Spirochaeta Ehrenberg 1835 (Approved Lists 1980) emend. Shivani et al. 2015

Universal Root Woese et al. 1990

Bacteria (None 2015) Woese et al. 1990

Spirochaetota corrig. Garrity and Holt 2021

Spirochaetes (sic) Garrity and Holt 2021 non Spirochaetes Cavalier-Smith 2002

Spirochaetia (Cavalier-Smith 2002) Paster 2020

Spirochaetales Buchanan 1917 (Approved Lists 1980) emend. Hördt et al. 2020

Spirochaetaceae Swellengrebel 1907 (Approved Lists 1980) emend. Hördt et al. 2020

Spirochaetales Buchanan 1917 (Approved Lists 1980) emend. Hördt et al. 2020

Incertae sedis 31 None 2015

Borreliaceae Gupta et al. 2014

Treponemataceae Robinson 1948 (Approved Lists 1980) emend. Hördt et al. 2020

Brachyspiraceae Paster 2012

Brevinemataceae Paster 2012

Leptospiraceae Hovind-Hougen 1979 (Approved Lists 1980) emend. Levett et al. 2005

Sphaerochaetaceae Hördt et al. 2020 non Sphaerochaetaceae Bidzhieva et al. 2020

Sphaerochaetaceae Bidzhieva et al. 2020 non Sphaerochaetaceae Hördt et al. 2020

Breznakiellaceae Brune et al. 2022

Rectinemataceae Brune et al. 2022

Hollandina (ex To and Margulis 1978) Bermudes et al. 1988

Treponema Schaudinn 1905 (Approved Lists 1980) emend. Abt et al. 2013

Sphaerochaeta Ritalahti et al. 2012 emend. Bidzhieva et al. 2020

Salinispira Ben Hania et al. 2015

Alkalispirochaeta Sravanthi et al. 2016

Marispirochaeta Shivani et al. 2017

Sediminispirochaeta Shivani et al. 2016

Pleomorphochaeta Arroua et al. 2017

Saprospira Gross 1911 emend. Lewin and Leadbetter 1974 (Approved Lists 1980)

Clevelandina Bermudes et al. 1988

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Leptospira Noguchi 1917 (Approved Lists 1980) emend. Faine and Stallman 1982

Spirochaeta Ehrenberg 1835 (Approved Lists 1980) emend. Shivani et al. 2015

Cristispira Gross 1910 emend. Kuhn 1974 (Approved Lists 1980)

Rectinema Koelschbach et al. 2017

Oceanispirochaeta Subhash and Lee 2017

Spironema (sic) Sikutová et al. 2010

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