caldisericum caldisericum caldisericum exile is a species of bacteria sufficiently distinct from other bacteria to be placed in its own family, order, class and phylum. it is the first member of the thermophilic candidate phylum op5 to be cultured and described. caldisericum scientific classification domain: bacteria phylum: caldisericota class: caldisericiamori et al. 2009 order: caldisericalesmori et al. 2009 family: caldisericaceaemori et al. 2009 genus: caldisericummori et al. 2009 species: c. exile binomial name caldisericum exilemori et al. 2009 synonyms caldisericota mori et al. 2021: "caldiserica" mori et al. 2009 "caldisericota" whitman et al. 2018 "caldisericaeota" oren et al. 2015 candidate phylum op5