Genus Xxiii Thiospirillum Winogradsky 1888 104AL Johannes F Imhoff

Thi'' lum. Gr. n. thios sulfur; M.L. dim. neut. n. Spirillum abacterial genus; M.L. neut. n. Thiospirillum sulfur Spirillum.

Cells curved rods or spirals (sigmoid), dividing by binary fission, motile by (multitrichous) polar flagella. Cells may be immobile and grow in irregular aggregates surrounded by slime. Gram negative, belong to the Gammaproteobacteria, and contain internal photosynthetic membranes of vesicular type in which the pho-tosynthetic pigments bacteriochlorophyll a and carotenoids are located.

Obligately phototrophic and strictly anaerobic. Photolithoau-totrophic 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. Sulfate is the final oxidation product. Storage materials are polysaccharides, poly-b-hydroxybutyrate, S0, and polyphosphate.

Type species : Thiospirillum jenense (Ehrenberg 1838) Migula 1900, 1050 (Ophidomonas jenensis Ehrenberg 1838, 44.)

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