moorella thermoautotrophica moorella thermoautotrophica moorella thermoautotrophica, previously known as clostridium thermoautotrophicum, is a rod-shaped, endospore-forming bacterium belonging to the phylum bacillota. it is thermophilic, strictly anaerobic and acetogenic, and was isolated from a hot spring in yellowstone national park usa. moorella thermoautotrophica scientific classification domain: bacteria phylum: bacillota class: clostridia order: thermoanaerobacterales family: thermoanaerobacteraceae genus: moorella species: m. thermoautotrophica binomial name moorella thermoautotrophicacollins et al. 1994