moorella humiferrea moorella humiferrea moorella humiferrea is a gram-positive thermophilic, anaerobic and endospore-forming bacterium from the genus moorella, which has been isolated from sediments from the grot geyser, valley of geysers, kamchatka, russia. this microorganism is able to grow and reduce iron(iii) oxide when small amounts of humic acid are available. moorella humiferrea scientific classification domain: bacteria phylum: bacillota class: clostridia order: thermoanaerobacterales family: thermoanaerobacteraceae genus: moorella species: m. humiferrea binomial name moorella humiferreanepomnyashchaya et al. 2012 type strain 64_fgq, dsm 23265, vkm b-2603