thioalkalimicrobium thioalkalimicrobium thioalkalimicrobium is a defunct bacterial genus within the gammaproteobacteria. all 4 species in the genus were reclassified to the genus thiomicrospira in 2017. thioalkalimicrobium scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: thiotrichales family: piscirickettsiaceae genus: thioalkalimicrobiumsorokin et al. 2001 type species thioalkalimicrobium aerophilum (now thiomicrospira aerophila) species t. aerophilum t. cyclicum t. microaerophilum t. sibiricum synonyms thioalcalomicrobium, thialkalimicrobium