dorea dorea dorea is a gram-positive and nonspore-forming bacterial genus from the family lachnospiraceae, which occur in human faeces. dorea scientific classification domain: bacteria phylum: bacillota class: clostridia order: eubacteriales family: lachnospiraceae genus: doreataras et al. 2002 type species dorea formicigenerans species d. acetigenes d. ammoniilytica d. formicigenerans d. hominis d. longicatena