marixanthomonas marixanthomonas marixanthomonas is a gram-negative, aerobic and non-motile genus of bacteria from the family of flavobacteriaceae with on know species (marixanthomonas ophiurae). marixanthomonas scientific classification domain: bacteria phylum: bacteroidota class: flavobacteriia order: flavobacteriales family: flavobacteriaceae genus: marixanthomonasromanenko et al. 2007 species m. ophiurae