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Aegicerativicinus sediminis gen. nov., sp. nov., a novel carotenoid-producing marine bacterium in the family Flavobacteriaceae


A novel bright-yellow pigmented bacterial strain SM2-FT was isolated from a mangrove sediment collected at the mangrove coast of Luoyang estuary, Quanzhou, China. Strain SM2-FT was Gram-stain-negative, catalase-weak positive, oxidase-positive, rod-shaped, non-flagellated and non-motile. Growth of strain SM2-FT was observed at 20–40 °C (optimum, 30 °C), pH 6.0–8.0 (optimum, pH 7.0) and in the presence of 1.0–4.0% NaCl (optimum, 2.0% NaCl). Flexirubin-pigment was absent, and carotenoid-pigment was present. Phylogenetic analysis of 16S rRNA gene sequence placed strain SM2-FT into the family Flavobacteriaceae and shared the maximum sequence similarity with Aequorivita soesokkakensis RSSK-12 T of 92.5%. Whole genomic comparison between strain SM2-FT and close relatives suggested a novel species of a novel genus. The predominant quinone of strain SM2-FT was menaquinone (MK)-6. The major fatty acids (> 10%) comprised iso-C15:1 G (32.4%) and iso-C15:0 (29.1%). The polar lipid profile consisted of phosphatidylethanolamine, two unidentified aminolipids and four unidentified lipids. The complete genome size was 4,094,245 bp with DNA G + C content of 36.0 mol%. Based on the data of polyphasic study, strain SM2-FT was considered to represent a novel species of a novel genus, for which the name Aegicerativicinus sediminis gen. nov., sp. nov., was proposed. The type strain was SM2-FT (= MCCC 1K04383T = KCTC 82361 T).

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Fig. 1

Data availability

The GenBank/EMBL/DDBJ accession numbers of the 16S rRNA gene sequence and complete genome sequence of strain SM2-FT are MT829543 and CP064295, respectively.



Marine culture collection of China


Korean collection for type cultures


Digital DNA-DNA hybridization


Average nucleotide identity


Percentage of conserved proteins






Bayesian information CRITERION


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The authors would like to thank Prof. Aharon Oren (The Hebrew University of Jerusalem, Israel) for his advice on naming the new species.


This work was supported by the project of National Science Foundation of Fujian Province (2020J01789) and National Infrastructure of Natural Resources for Science and Technology Program of China (NIMR-2020–9).

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ZH and QL conceived the study and drafted the manuscript. ZH, YG, QL, XL, and QX performed the experiment and analyze the data.

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Correspondence to Zhaobin Huang or Qiliang Lai.

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Huang, Z., Guo, Y., Xiao, Q. et al. Aegicerativicinus sediminis gen. nov., sp. nov., a novel carotenoid-producing marine bacterium in the family Flavobacteriaceae. Antonie van Leeuwenhoek 114, 1551–1563 (2021).

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  • Flavobacteriaceae
  • Aegicerativicinus sediminis
  • Mangrove sediment