cognatishimia cognatishimia cognatishimia is a gram-negative and aerobic genus of bacteria from the family of rhodobacteraceae with one known species (cognatishimia maritima). cognatishimia maritima has been isolated from sea water near gheje island in korea. cognatishimia scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: rhodobacterales family: rhodobacteraceae genus: cognatishimiawirth and whitman 2018 type species cognatishimia maritima species c. maritima