ursidibacter ursidibacter ursidibacter is a genus of bacteria from the class of pasteurellaceae. ursidibacter scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pasteurellales family: pasteurellaceae genus: ursidibacterjohanne et al. 2015 type species ursidibacter maritimus species u. arcticus u. maritimus