 For the following description, "Nitrospira moscoviensis" will be representative of the Nitrospira genus.Nitrospira is a gram-negative nitrite-oxidizing organism with a helical to vibroid morphology (0.9–2.2 × 0.2–0.4 micrometres in size).They are non-planktonic organisms that reside as clumps, known as aggregates, in biofilms.