ursidibacter maritimus ursidibacter maritimus ursidibacter maritimus is a bacterium from the genus of ursidibacter which has been isolated from the oral cavity of a polar bear from greenland. ursidibacter maritimus scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pasteurellales family: pasteurellaceae genus: ursidibacter species: u. maritimus binomial name ursidibacter maritimusjohanne et al. 2015 type strain ccug 65144, dsm 28137