acetanaerobacterium acetanaerobacterium acetanaerobacterium is a genus in the phylum bacillota (bacteria). the genus contains a single species, a. elongatum ( chen and dong 2004, sp. nov.). acetanaerobacterium scientific classification domain: bacteria phylum: bacillota class: clostridia order: eubacteriales family: oscillospiraceae genus: acetanaerobacterium type species a. elongatum