Genus XXI Thiorhodococcus Guyoneaud Matheron Liesack Imhoff and Caumette 1998a 328VP Effective publication Guyoneaud Matheron Liesack Imhoff and Caumette 1997

REmi Guyoneaud, Pierre Caumette and Johannes F Imhoff

Thi''ccus. Gr. n. thios sulfur; Gr. n. rhodon the rose; L. n. coccus sphere; M.L. masc. n. Thiorhodococcus rose sphere with sulfur.

Cells spherical to slightly ovoid, diplococcus-shaped before cell division, motile by flagella. Cells single or in pairs but may form irregular aggregates, multiply by binary fission. Gram negative, belong to the Gammaproteobacteria, and contain internal photo-synthetic membranes of vesicular type with bacteriochlorophyll a and carotenoids as photosynthetic pigments.

Photolithoautotrophic growth under anoxic conditions in the light with sulfide and S0 as electron donors. During oxidation of sulfide, S0 transiently stored inside the cells in the form of highly refractile globules. Final oxidation product is sulfate. In the presence of sulfide and bicarbonate, simple organic substrates are photoassimilated. Chemotrophic growth is possible under mi-crooxic conditions in the dark.

Habitat: water and sediment of marine and brackish environments containing hydrogen sulfide.

Type species: Thiorhodococcus minor Guyoneaud, Matheron, Liesack, Imhoff and Caumette 1998a, 328 (Effective publication: Guyoneaud, Matheron, Liesack, Imhoff and Caumette 1997, 22.)

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