thermothrix azorensis thermothrix azorensis thermothrix azorensis is a gram-negative, facultatively chemolithoautotrophic, non-spore-forming, aerobic, thermophilic, sulfur-oxidizing bacterium of the genus thermothrix, isolated from a hot spring on sao miguel island in the azores. t. azorensis uses thiosulfate, tetrathionate, hydrogen sulfide, and elemental sulfur for its sources of energy (chemolithoautotrophic). thermothrix azorensis scientific classification domain: bacteria phylum: aquificota order: aquificales family: aquificaceae genus: thermothrix species: t. azorensis binomial name thermothrix azorensisodintsova et al. 1996