chloracidobacterium chloracidobacterium chloracidobacterium is a genus of the acidobacteriota. it is currently assigned to the family acidobacteriaceae, but phylogenetic evidence suggests that it belongs in blastocatellia. chloracidobacterium scientific classification domain: bacteria phylum: acidobacteriota class: "acidobacteriia" order: acidobacteriales family: acidobacteriaceae genus: "chloracidobacterium"tank and bryant 2015 type species "chloracidobacterium thermophilum"tank and bryant 2015 species "c. aggregatum" "c. thermophilum" "c. validum" synonyms "ca. chloracidobacterium" bryant et al. 2007 this is a group of photosynthetic bacteria were discovered in 2007 and their identification extends the number of bacterial phyla that can carry out chlorophyll-based photosynthesis from five to six. "candidatus chloracidobacterium thermophilum" the organism "candidatus chloracidobacterium thermophilum" was initially detected through the bioinformatics analyses of metagenomic sequence data from the microbial mats collected from a hot spring in yellowstone national park. it was later isolated after the inhibition of synechococcus species in the microbial mats samples, leading to a co-culture c. thermophilum, anoxybacillus species, and meiothermus species. c. thermophilum was plated on midnight medium (ctm) media to culture it for pure isolation. genomic sequencing of the bacterium revealed that it did not contain genes for the enzymes to reduce sulfate, yet it was dependent on a reduced sulfur source. the researchers likely speculated that it shared a mutualistic relationship with the cocultures of meiothermus species and anoxybacillus species for access to reduced sulfur sources. in addition, the bacterium was determined to be aerophilic, moderately thermophilic, anoxygenic and photoheterotrophic. ultimately, they found that it is dependent on a reduced sulfur source, bicarbonate, l-lysine, and vitamin b12 for pre culture isolation. phylogeny the currently accepted taxonomy is based on the list of prokaryotic names with standing in nomenclature (lpsn) and national center for biotechnology information (ncbi) 16s rrna based ltp_01_2022 and dedysh & yilmaz 2018 120 marker proteins based gtdb 07-rs207 blastocatellia order 24 blastocatellales order 14-2 chloracidobacterium thermophilum "c. validum" saini et al. 2021 "c. aggregatum" saini et al. 2021 "c. thermophilum" tank & bryant 2015