Flavobacterium denitrificans is a species of N<sub>2</sub>O-producing facultative aerobic bacteria first isolated from the gut of the earthworm Aporrectodea caliginosa. It is a Gram-negative, motile rod with type strain ED5<sup>T</sup> (=DSM 15936<sup>T</sup> =ATCC BAA-842<sup>T</sup>).