herpetosiphon herpetosiphon herpetosiphon is a genus of bacteria in the family herpetosiphonaceae. herpetosiphon scientific classification domain: bacteria phylum: chloroflexota class: chloroflexia order: herpetosiphonales family: herpetosiphonaceae genus: herpetosiphonholt and lewin 1968 type species herpetosiphon aurantiacusholt & lewin 1968 species h. aurantiacus h. geysericola h. giganteus h. gulosus h. llansteffanensis phylogeny 16s rrna based ltp_01_2022 120 marker proteins based gtdb 07-rs207 h. geysericola (copeland 1936) lewin 1970 h. llansteffanensis corrig. livingstone et al. 2019 h. giganteus (soriano 1945) reichenbach & golecki 1975 ex pan et al. 2017 h. aurantiacus holt & lewin 1968 h. gulosus pan et al. 2017 h. aurantiacus h. llansteffanensis h. geysericola h. giganteus