acetofilamentum acetofilamentum acetofilamentum is a genus in the phylum bacteroidota (bacteria). acetofilamentum scientific classification domain: bacteria phylum: bacteroidota class: bacteroidia order: bacteroidales family: bacteroidaceae genus: acetofilamentum type species a. rigidum etymology the name acetofilamentum derives from:latin noun acetum, vinegar; latin neuter gender noun filamentum, a spun thread; neo-latin neuter gender noun acetofilamentum, an acetate-producing, filamentous, threadlike bacterium. species the genus contains single species, namely a. rigidum ( dietrich et al. 1989, (type species of the genus).; latin neuter gender adjective rigidum, stiff, rigid.)