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A bacterial strain designated GISW-4T was isolated from the reef-building coral Stylophora pistillata, collected from seawater off the coast of southern Taiwan, and was characterized in this taxonomic study using a polyphasic approach. Strain GISW-4T was Gram-stain-negative, aerobic, beige, rod-shaped, and dimorphic, either non-motile with stalks (or prosthecae), or non-stalked and motile by means of a single polar flagellum. 16S rRNA gene sequence studies showed that the novel strain clustered with Oceanicaulis alexandrii C116-18T (98.9 % 16S rRNA gene sequence similarity). Strain GISW-4T exhibited optimal growth at 35–40 °C, 1–2 % (w/v) NaCl and at pH 7–9. The predominant cellular fatty acids (>10 %) were C18 : 0, C18 : 1ω7c and C18 : 1ω7c 11-methyl. The predominant polar lipids were phosphatidylglycerol, sulfoquinovosyl diacylglycerol and two unknown phospholipids (PL1–2). The major respiratory quinones were ubiquinone Q-10 and Q-9, and the DNA G+C content was 61.6 mol%. The results of physiological and biochemical tests allowed clear phenotypic differentiation of strain GISW-4T from the type strain of O. alexandrii . It is evident from the genotypic, phenotypic and chemotaxonomic data that the isolate should be classified as a novel species of the genus Oceanicaulis . The name proposed for this taxon is Oceanicaulis stylophorae sp. nov., with the type strain GISW-4T ( = LMG 25723T = BCRC 80207T).
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