acetonema acetonema acetonema is a genus of bacteria in the family veillonellaceae. it is h2-oxidizing co2-reducing acetogenic strictly anaerobic endospore-forming gram-negative motile rod-shaped, isolated from gut contents of the wood-feeding termite pterotermes occidentis. cells are catalase positive, oxidase negative, and have 51.5 mol percent g + c in their dna. optimum conditions for growth on h2 + co2 are at 30–33 degrees c and ph (initial) 7.8. acetonema longum is the sole species within the genus. acetonema scientific classification domain: bacteria phylum: bacillota class: clostridia order: clostridiales family: veillonellaceae genus: acetonemakane and breznak 1992 type species acetonema ecieslongum species a. longum