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Stenothermobacter spongiae gen. nov., sp. nov., a novel member of the family Flavobacteriaceae isolated from a marine sponge in the Bahamas, and emended description of Nonlabens tegetincola

¹ Coastal Marine Laboratory/Department of Biology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR
² Department of Biology, The Chinese University of Hong Kong, Shatin, NT, Hong Kong SAR
³ Center for Marine Science, University of North Carolina at Wilmington, USA

Correspondence
Pei-Yuan Qian
boqianpy{at}ust.hk

A bacterial strain, UST030701-156^T, was isolated from a marine sponge in the Bahamas. Strain UST030701-156^T was orange-pigmented, Gram-negative, rod-shaped with tapered ends, slowly motile by gliding and strictly aerobic. The predominant fatty acids were a15 : 0, i15 : 0, i15 : 0 3-OH, i17 : 0 3-OH, i17 : 19c and summed feature 3, comprising i15 : 0 2-OH and/or 16 : 17c. MK-6 was the only respiratory quinone. Flexirubin-type pigments were not produced. Phylogenetic analysis based on 16S rRNA gene sequences placed UST030701-156^T within a distinct lineage in the family Flavobacteriaceae, with 93·3 % sequence similarity to the nearest neighbour, Nonlabens tegetincola. The DNA G+C content of UST030701-156^T was 41·0 mol% and was much higher than that of N. tegetincola (33·6 mol%). Strain UST030701-156^T can be distinguished from other members of the Flavobacteriaceae by means of a number of chemotaxonomic and phenotypic characteristics. It is proposed, therefore, that UST030701-156^T represents a novel taxon designated Stenothermobacter spongiae gen. nov., sp. nov. The type strain is UST030701-156^T (=NRRL B-41138^T=JCM 13191^T). Carbon-source utilization by N. tegetincola was re-examined and an emended description is therefore included.

A neighbour-joining dendrogram for strain UST030701-156^T and related species and the results of API 20E, API 20NE, API ZYM, API 50 CH and MicroLog 3 tests are available as supplementary material in IJSEM Online.

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