1) Eubacteria 2) Eubacterium 3) True bacteria 1) Thiobacteria 
(from the article `bacteria`) ...europaea oxidizes ammonia (NH4+) to nitrite, and Nitrobacter winogradsky oxidizes nitrite to nitrate. Thiobacillus oxidizes thiosulfate and ... ...salt water. Examples of genera: Vibrio (cholera bacteria), Pseudomonas, Nitrosomonas, Thiobacillus.Order RickettsialesObligate intracellular ... Thiobacill...
A genus of gram-negative, rod-shaped bacteria that derives energy from the oxidation of one or more reduced sulfur compounds. Its organisms are widely distributed in marine, freshwater, and soil environments, especially where oxidizable sulfur is abundant. ... (12 Dec 1998) ... 
[n] - small rod-shaped bacteria living in sewage or soil and oxidizing sulfur
noun small rod-shaped bacteria living in sewage or soil and oxidizing sulfur