Imhoff 1998b 963VP

Pierre Caumette, REmi Guyoneaud and Johannes F. Imhoff

Thi''vum. Gr. n. thios sulfur; Gr. n. lampros bright, brilliant; L. n. ovum egg; M.L. neut. n. Thiolamprovum bright egg with sulfur.

Cells nearly spherical to oval, 2 X 2-3 |im, may occur in regular platelets of 4-16 cells, nonmotile, and multiply by binary fission. Gram negative, belong to the Gammaproteobacteria, and have internal photosynthetic membranes of vesicular type containing the photosynthetic pigments bacteriochlorophyll a and carote-noids.

Photolithoautotrophic growth under anoxic conditions in the light occurs with sulfide, thiosulfate, and sulfur 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. In the presence of sulfide and bicarbonate, simple organic substrates can be photoassimilated. Chemoauto-trophic or mixotrophic growth under microoxic to oxic conditions in the dark is possible.

The mol% G + C of the DNA is: 64.5-66.5 (Bd). Type species: Thiolamprovum pedioforme (Eichler and Pfennig 1986) Guyoneaud, Suling, Petri, Matheron, Caumette, Pfennig and Imhoff 1998b, 963 (Amoebobacterpedioformis Eichler and Pfennig 1986, 300.)

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