flexithrix flexithrix flexithrix is a gram-negative, non-spore-forming and motile genus from the family of flammeovirgaceae with one known species (flexithrix dorotheae) which first has been isolated from marine mud. flammeovirga produce zeaxanthin, poly-β-d-glutamic acid and poly-β-l-glutamine. flexithrix scientific classification kingdom: bacteria phylum: bacteroidota class: cytophagia order: cytophagales family: flammeovirgaceae genus: flexithrixlewin 1970 species f. dorotheae