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= Candidatus Thiodictyon syntrophicum = Candidatus Thiodictyon syntrophicum are gram-negative bacteria and are classified as purple sulfur bacteria (PSB). Candidatus Thiodictyon syntrophicum grows best under micro-oxic and low light conditions. There has only been one successful culture of Candidatus Thiodictyon syntrophicum; Candidatus Thiodictyon syntrophicum strain Cad16T.

Classification
Candidatus Thiodictyon syntrophicum belongs to the family Chromatiaceae and class Gammaproteobacteria. This species is known to be related to the genera Lamprocystis, Thiocystis and Thiocapsa. The Cad16T strain of Candidatus Thiodictyon syntrophicum was previously assigned to the genus Lamprocystis, but was recently reassigned to the genus Thiodictyon by Peduzzi et al..

Environment
A strain of Candidatus Thiodictyon syntrophicum, Cad16T, was isolated from Lake Cadagno in Switzerland. This lake is meromictic, and its layers create diverse ecological niches which support the growth of diverse and often novel species. Meromictic lakes are often euxinic, meaning it is both anoxic and sulphidic at depth.

Strain Cad16T
Cad16T is a strain of Candidatus Thiodictyon syntrophicum which was isolated from Lake Cadagno in Switzerland.

Strain Cad16T Carbon Fixation
Candidatus Thiodictyon syntrophicum strain Cad16T has the capability for CO2 fixation, and was found to play a key role in the overall inorganic carbon fixation that occurred in Lake Cadagno.