spiribacter roseus spiribacter roseus spiribacter roseus is a gram-negative and non-motile bacterium from the genus of spiribacter which has been isolated from a saltern from isla cristina in spain. spiribacter roseus scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: chromatiales family: ectothiorhodospiraceae genus: spiribacter species: s. roseus binomial name spiribacter roseusleon et al. 2016 type strain ibrc-m 11076, ssl25, ssl4, ssl50, ssl97