fusibacter paucivorans fusibacter paucivorans fusibacter paucivorans is a thiosulfate-reducing bacterium from the family peptostreptococcaceae. it is the most studied species of the genus fusibacter, isolated from oil-producing wells. fusibacter paucivorans scientific classification domain: bacteria phylum: bacillota class: clostridia order: eubacteriales family: peptostreptococcaceae genus: fusibacter species: f. paucivorans binomial name fusibacter paucivoransravot et al. 1999