geovibrio ferrireducens geovibrio ferrireducens geovibrio ferrireducens is a gram-negative, fe(iii)-reducing, obligately anaerobic and motile bacterium from the genus of geovibrio. geovibrio ferrireducens scientific classification domain: bacteria phylum: deferribacterota class: deferribacteres order: deferribacterales family: deferribacteraceae genus: geovibrio species: g. ferrireducens binomial name geovibrio ferrireducenscaccavo et al. 2000 type strain atcc 51996, pal-1