holosporaceae holosporaceae the holosporaceae are a family of bacteria. the member holospora is an intracellular parasite found in the unicellular protozoa paramecium. holosporaceae scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria subclass: caulobacteridae order: holosporales family: holosporaceaegörtz and schmidt 2006 genera "candidatus bealeia" szokoli et al. 2016 "candidatus cytomitobacter" tashyreva et al. 2018 "candidatus gortzia" serra et al. 2016 "candidatus hafkinia" fokin et al. 2019 "'candidatus hepatobacter nunan et al. 2013 holospora (ex hafkine 1890) gromov and ossipov 1981 "candidatus hydrogenosomobacter" takeshita et al. 2019 "preeria" potekhin et al. 2018 pseudocaedibacter quackenbush 1982 symbiotes philip 1956 (approved lists 1980) tectibacter (ex preer et al. 1974) preer and preer 1982 genome draft genome sequences are available for three holospora species and odyssella thessalonicensis .