Differentiation of the genus Thiopedia from other


Characteristics that differentiate Thiopedia species from other phototrophic members of the family Chromatiaceae are: i) the arrangement of the cells in rectangular platelets, ii) possession of gas vesicles, and iii) the purple-red color of cultures and colonies, which is due to the carotenoid okenone. Platelets similar to those of Thiopedia species are formed by Thiolamprovum pedi-

oforme. Characteristics for differentiation of Thiopedia species from other spherical and nonmotile purple sulfur bacteria and from other phototrophic Chromatiaceae species are shown in Table BXII.y.6 of the chapter describing the family Chromatiaceae.

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