Domain Bacteria Woese et al. 1990
   Phylum Chloroflexi Garrity and Holt 2001
     Class "Chloroflexi" Castenholz 2001 nom. inval. see Class Chloroflexia Gupta et al. 2013
       Order "Herpetosiphonales" Castenholz 2001 nom. nud. see Order Herpetosiphonales Gupta et al. 2013
         Family "Herpetosiphonaceae" Castenholz 2001 nom. nud. see Family Herpetosiphonaceae Gupta et al. 2013
           1 Genus Herpetosiphon Holt and Lewin 1968 (Approved Lists 1980)