hydrogenibacillus hydrogenibacillus hydrogenibacillus is a thermophilic and facultatively chemolithoautotrophic genus of bacteria from the family of bacillaceae with one known species (hydrogenibacillus schlegelii). bacillus schlegelii was transferred to hydrogenibacillus schlegelii hydrogenibacillus scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: bacillaceae genus: hydrogenibacilluskämpfer et al. 2013 species h. schlegelii