波罗的海莱茵海默氏菌是Rheinheimera属的微生物，原产地为波罗的海。Colonies are circular, smooth, convex, entire and opaque with a blue colour. Colony colour ranges from intense dark blue to light blue. Colonies can be stained entirely or only in the centre of the colony. Cells are variable in shape, ranging from rod-shaped to coccoid, and size (width 0±5–1±5 ?m, length 0±9–2±5 ?m).。[1]