Phylum Chloroflexi Garrity and Holt 2001
   Chloroflexi Castenholz 2001 nom. inval. see Class Chloroflexia Gupta et al. 2013
     Genus Herpetosiphon Holt and Lewin 1968 (Approved Lists 1980)
       1 Herpetosiphon aurantiacus Holt and Lewin 1968 (Approved Lists 1980)
       2 Herpetosiphon geysericola (Copeland 1936) Lewin 1970 (Approved Lists 1980)