xenorhabdus romanii xenorhabdus romanii xenorhabdus romanii is a bacterium from the genus of xenorhabdus which has been isolated from the nematode steinernema puertoricense in puerto rico. xenorhabdus romanii scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: enterobacterales family: morganellaceae genus: xenorhabdus species: x. romanii binomial name xenorhabdus romaniitailliez et al. 2006 type strain cip 109070, dsm 17910, pr06-a