arthrobacter rhombi arthrobacter rhombi arthrobacter rhombi is a gram-positive, aerobic, non-spore-forming and non-motile bacterium species from the genus arthrobacter which has been isolated from the halibut, reinhardtius hippoglossoides. arthrobacter rhombi scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: micrococcales family: micrococcaceae genus: arthrobacter species: a. rhombi binomial name arthrobacter rhombiosorio et al. 1999 type strain ccug 38813cip 107337collins f.58.3cb.57dsm 15838f.58.3cb.57f.98.3hr.69jcm 11678lmg 22201ncimb 13909