Vibrio chemaguriensis sp. nov., from Sundarbans, Bay of Bengal

  • Anwesha Ghosh
  • Punyasloke BhaduryEmail author


A new species of Vibrio (annotated as SBOTS_Iso1) was isolated in August 2014 from the Stn1 located in Chemaguri creek of Sundarbans mangrove ecoregion and taxonomically characterized using a polyphasic approach. Phenotypic analysis including biochemical tests and growth across a wide range of salinities indicated the typical estuarine characteristics of this new species. The bacterium was Gram negative, rod-shaped, oxidase and catalase negative and grows in the presence of NaCl. FAME analysis indicated 31.7% of the cellular fatty acids to be made up of 16:1 ω7c/16:1 ω6c. Amplification and sequencing of 16S rRNA and multilocus sequence analysis of four loci (2040 bp; rpoA, topA, mreB, pyrH) and additional sequence data of ftsZ, atpD, ompW and rpoB genes showed this isolate to be a member of Harveyi clade of the genus Vibrio. The closest phylogenetic neighbour was Vibrio alginolyticus ATCC 17749T with 96.8% similarity. Whole-genome sequence data indicates the presence of ~ 5 Mbp genome. GGDC, orthoANIu and AAI indicated 45%, 92% and 0.962 identity respectively with genome of Vibrio alginolyticus ATCC 17749T. The isolate SBOTS_Iso1 has been named Vibrio chemaguriensis sp. nov. on the name of the site from where it was first isolated.



Accession number of 16S rRNA sequence


Whole-genome sequence accession number


Digital Protologue number



Anwesha Ghosh is the recipient of IISER Kolkata Integrated Ph.D. Fellowship. This work is partly supported by grants from IISER Kolkata as well as from WWF-India awarded to Punyasloke Bhadury.

Compliance with Ethical Standards

Conflict of interest

The authors declare no conflict of interest.

Supplementary material

284_2019_1731_MOESM1_ESM.docx (26 kb)
Supplementary material 1 (DOCX 26 kb)
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Supplementary material 2 Fig. S1 The top left panel indicated the cell size and shape as observed under 100× magnification using a light microscope. The top right panel shows DAPI stained image from binding of the dye to the nuclei acid of SBOTS_Iso1 as observed under fluorescent microscopy. The lower left panel shows single cells of SBOTS_Iso1 as observed under FESEM. The lower right panel shows TEM image. The scale bar and magnification is indicated in each image (JPEG 3932 kb)
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Supplementary material 3 Fig. S2 The OD (600 nm) versus time (h) values obtained during the growth curve experiment performed at different salinities. Growth of the isolate at salinity 11.5, temperature 32 °C and pH 8 indicated the in situ conditions of the study site during sampling (TIFF 2607 kb)
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Supplementary material 4 Fig. S3 The OD (600 nm) versus media pH shows growth of the isolate at different media pH levels at salinity 11.5 and incubation at 32 °C (TIFF 11 kb)
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Supplementary material 5 Fig. S4 Circular genome of the SBOTS_Iso1 (TIFF 234 kb)
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Supplementary material 6 Fig. S5a Alignment between genomes of V. alginolyticus ATCC17749T and SBOTS_Iso1 (TIFF 254 kb)
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Supplementary material 7 Fig. S5b Circular genome map indicating ORFs, GC content, GC skew and alignment genome7 (TIFF 1695 kb)
284_2019_1731_MOESM8_ESM.tif (130 kb)
Supplementary material 8 Fig. S6 Genome map showing the position of genomic islands (typically > 8 kb) as seen against V. alginolyticus ATCC17749T reference genome. Genes within these genomic islands might be linked to antibiotic resistance or virulence (TIFF 130 kb)
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Supplementary material 9 Fig. S7 Results indicating in silico phenotyping obtained from genome sequence of SBOTS_Iso1 (TIFF 1801 kb)


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Authors and Affiliations

  1. 1.Integrative Taxonomy and Microbial Ecology Research Group, Department of Biological SciencesIndian Institute of Science Education and Research KolkataMohanpurIndia

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