1887

Abstract

Bacterial strains UST030701-097 and UST030701-084 were isolated from a marine sponge in the Bahamas. Both strains were pink-pigmented, Gram-negative, strictly aerobic and chemo-organotrophic. Cells of strain UST030701-097 were short, curved rods with fast-gliding motility, whereas those of strain UST030701-084 were straight rods with a less rapid gliding motion. The two strains had MK-7 as the major respiratory quinone and did not produce flexirubin-type pigments. The DNA G+C contents of strains UST030701-097 and UST030701-084 were 42.5 and 43.7 mol%, respectively. Phylogenetic analysis based on 16S rRNA gene sequences indicated that the two strains belonged to the family ‘’ of the phylum . 16S rRNA gene sequence similarity between strains UST030701-097 and UST030701-084 was 95.0 %; their closest relative was [] , with 93.3 % and 96.0 % sequence similarity, respectively. Phylogenetic tree topology indicated that the two strains belonged to the same lineage, but were on separate branches. Whilst strain UST030701-084 and [] were found on one branch, strain UST030701-097 was in another branch that had no species with validly published names. Based on the polyphasic taxonomic data obtained in the present study, we propose that strain UST030701-097 represents a novel genus and that strain UST030701-084 represents a novel species in the phylum . The genus gen. nov. is proposed, with strain UST030701-097 (=NRRL B-41220=JCM 13334) as the type strain of the type species, sp. nov. Strain UST030701-084 (=NRRL B-41219=JCM 13337) is proposed as the type strain of sp. nov. In an earlier study, it was suggested that the genus is a later heterotypic synonym of the genus . However, a formal proposal to reclassify [] , the only member of the genus , has not yet been made. The results of phylogenetic analyses in this study support the reclassification of [] as comb. nov.

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2006-05-01
2021-04-18
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