Rhodococcus marinonascens sp. nov., an Actinomycete from the Sea

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Abstract
Two groups of nocardioform organisms isolated from marine sediments were studied, along with representative strains of the genera Rhodococcus, Nocardia, and Mycobacterium. Strains of the red- or orange-colored group showed no marine affinity and exhibited a close relationship to Rhodococcus rhodochrous. The 17 marine isolates of the cream-colored group formed a homogeneous well-separated cluster and were particularly characterized as moderately halophilic and psychrotrophic organisms. These isolates were assigned to a new species within the genus Rhodococcus. We propose the name Rhodococcus marinonascens, referring to the exclusive occurrence of this taxon in the sea, and describe the properties of the species and of type strain 3438W (= DSM 43752).