yersinia similis yersinia similis yersinia similis is a gram-negative bacteria species of yersinia that resembles yersinia pseudotuberculosis phenotypically but differs on the basis of 16s ribosomal rna sequences. the type strain y228 (=ccug 52882 =dsm 18211 =lmg 23763) was originally isolated from a rabbit in germany. yersinia similis scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: enterobacterales family: yersiniaceae genus: yersinia species: y. similis binomial name yersinia similissprague et al., 2008 etymology yersinia similis, l. fem. adj. similis, similar, resembling, as the strains are similar to those of yersinia pseudotuberculosis.