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 "Chloroflexales" Castenholz 2001 nom. nud. see Order Chloroflexales Gupta et al. 2013 Family "Chloroflexaceae" Pierson 2001 nom. nud. see Family Chloroflexaceae Gupta et al. 2013 Genus Heliothrix Pierson et al. 1986