yersinia massiliensis yersinia massiliensis yersinia massiliensis is a gram-negative bacteria that is commonly isolated from the environment and food. the type strain is ccug 53443 (=cip 109351 =dsm 21859). yersinia massiliensis scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: enterobacterales family: yersiniaceae genus: yersinia species: y. massiliensis binomial name yersinia massiliensismerhej et al., 2008 etymology yersinia massiliensis, mas.si.li.en’sis n.l. masc./fem. adj. massiliensis, pertaining to massilia, the ancient roman name of marseille, france, where the type strain was isolated.