marinobacter xestospongiae marinobacter xestospongiae marinobacter xestospongiae is a gram-negative, slightly halophilic and non-spore-forming bacterium from the genus of marinobacter which has been isolated from the sponge xestospongia testudinaria from the sea coast of saudi arabia. marinobacter xestospongiae scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: alteromonadales family: alteromonadaceae genus: marinobacter species: m. xestospongiaelee et al. 2012 binomial name marinobacter xestospongiae type strain jcm 17469, nrrl b-59512, ust090418-1611 synonyms marinobacter mosjesanensis