methanoculleus hydrogenitrophicus methanoculleus hydrogenitrophicus methanoculleus hydrogenitrophicus is a methanogen. methanoculleus hydrogenitrophicus scientific classification domain: archaea kingdom: euryarchaeota class: methanomicrobia order: methanomicrobiales family: methanomicrobiaceae genus: methanoculleus species: m. hydrogenitrophicus binomial name methanoculleus hydrogenitrophicustian et al. 2010