thiomicrospira siberica thiomicrospira siberica thiomicrospira siberica is a species of obligately alkaliphilic and obligately chemolithoautotrophic sulfur-oxidizing bacteria. it was first isolated from soda lakes in northern russia, hence the specific epithet. in 2017, all 4 species of the genus thioalkalimicrobium were reclassified to thiomicrospira. thiomicrospira siberica scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: thiotrichales family: piscirickettsiaceae genus: thioalkalimicrobium species: t. siberica binomial name thiomicrospira sibericaboden et al. 2017