Abstract
Summary In the course of ecological studies in salinas and salt-works of Salin de Giraud (Camargue, France), a halophilic strain of the Chromatiaceae was isolated from a red layer below the gypsum crust. Because of its morphology, this strain (SG 3201) was assigned to the genus Chromatium , resembling Chromatium buderi and Chromatium vinosum . However it differed from these species in some physiological characteristics, in particular pigment composition, salinity range with 10% NaCl requirement for optimum growth, and utilization of some substrates. It is the first described Chromatium strain with high NaCl requirement. Therefore, a new species, Chromatium salexigens , is proposed.
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