Mityushina 1999b 700VP

Johannes F. Imhoff and Vladimir M. Gorlenko

Thi'o.rho'do.spi'ra. Gr. n. thios sulfur; Gr. n. rhodon the rose; Gr. n. spira spiral; M.L. fem. n. Thiorhodospirathe spiral rose with sulfur.

Cells vibrioid or spiral-shaped, motile by means of a monopolar flagellar tuft, multiplies by binary fission. Gram-negative and belong to the Gammaproteobacteria. Internal photosynthetic membranes are parallel lamellae piercing the cytoplasm lengthwise or underlying the cytoplasmic membrane. Photosynthetic pigments are bacteriochlorophyll a and carotenoids.

Obligately phototrophic and strictly anaerobic. During pho-tolithoautotrophic growth with sulfide as the electron donor, globules of S0 are formed outside the cytoplasm, in the medium, attached to cells, or in the periplasm. The final oxidation product is sulfate. In the presence of sulfide, organic substances may be photoassimilated. Development is dependent on sodium salts in low concentrations and on alkaline conditions.

Habitat: surface of sediments rich in organic matter and mi-crobial mats from brackish soda lakes that contain hydrogen sulfide.

Type species: Thiorhodospira sibirica Bryantseva, Gorlenko, Kompantseva, Imhoff, Suling and Mityushina 1999b, 700.

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