caldithrix caldithrix caldithrix is a genus of thermophilic and anaerobic bacteria, currently assigned to its own phylum. caldithrix scientific classification domain: bacteria kingdom: eubacteria superphylum: fcb group phylum: calditrichotakublanov et al. 2021 class: "calditrichae"kublanov et al. 2017 order: calditrichaleskublanov et al. 2020 family: calditrichaceaekublanov et al. 2020 genus: caldithrixmiroshnichenko et al. 2003 type species caldithrix abyssimiroshnichenko et al. 2003 species c. abyssi miroshnichenko et al. 2003 c. palaeochoryensis miroshnichenko et al. 2010 synonyms calditrichota: "calditrichaeota" kublanov et al. 2017 "calditrichota" youssef et al. 2019 "calditrichae": "calditrichia" cavalier-smith 2020