Citrobacter Citrobacter freundii Scientific classification Domain: Bacteria Phylum: Proteobacteria Class: Gammaproteobacteria Order: Enterobacteriales Family: Enterobacteriaceae Genus: Citrobacter Werkman and Gillen, 1932 Species C. amalonaticus C. braakii C. diversus C. europaeus[1] C. farmeri C. freundii C. gillenii C. koseri C. murliniae C. pasteurii[1] C. rodentium C. sedlakii C. werkmanii C. youngae C. portucalensis[1]