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A Gram-positive-staining, catalase-positive, non-spore-forming, rod-shaped bacterium, strain IMMIB L-1606T, isolated from genital swabs of a horse, was characterized using a polyphasic approach. Comparative 16S rRNA gene sequence analysis showed that the organism was related to members of the genus Arthrobacter, displaying sequence similarities of 93.5–99.1 % with the type strains of recognized species of the genus. Cell-wall analysis revealed peptidoglycan type A3α l-Lys–l-Ser–l-Thr–l-Ala. DNA–DNA hybridization data and biochemical characterization of strain IMMIB L-1606T enabled the isolate to be differentiated genotypically and phenotypically from phylogenetically closely related species of the genus Arthrobacter. Therefore, it is concluded that strain IMMIB L-1606T represents a novel species of the genus Arthrobacter, for which the name Arthrobacter equi sp. nov. is proposed. The type strain of Arthrobacter equi sp. nov. is IMMIB L-1606T ( = DSM 23395T = CCUG 59597T).
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