Six strains of gram-negative, polarly flagellated, antibiotic-producing marine bacteria that synthesize an orange, noncarotenoid pigment were submitted to an extensive phenotypic characterization. All of them had properties characteristic of the genus Alteromonas. Two strains were closely related to Pseudomonas piscicida. The others could be considered as members of a new species for which the name Alteromonas aurantia is proposed. The type strain of A. aurantia is strain 208 (= ATCC 33046 = NCMB 2052).
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