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Abstract

A Gram-stain-negative, aerobic and rod-shaped bacterium, designated as HZG-20, was isolated from a tidal flat in Zhoushan, Zhejiang Province, China. The 16S rRNA sequence similarities between strain HZG-20 and RR4-56, NNCM2, P31 and X9-2-2 were 98.9, 91.7, 91.0 and 91.0%, respectively. Colonies of strain HZG-20 were 1.4 mm in diameter, milky white, round, smooth and convex after cultivating on marine agar at 30 °C for 48 h. Cells were catalase and oxidase-negative. Growth occurred at 15–37 ℃ (optimum, 28 ℃), pH 5.0–9.0 (optimum, pH 6.0–8.0) and with 0–8% (w/v) NaCl (optimum, 1–3%). It contained Menaquinone-8 (H) as the sole respiratory quinone, and C (11.8–13.6%), C c (6.8–13.3%) and C anteiso (10.9–27.7%) as the major cellular fatty acids. The main polar lipids were diphosphatidylglycerol, phosphatidylethanolamine, one unidentified phospholipid, one unidentified aminolipid, one unidentified phosphoglycolipid, two unidentified glycolipids (GL1–GL2) and three unidentified lipids (L1–L3). The genome of strain HZG-20 was 3 835 886 bp in length, comprised 3746 protein-coding genes, with DNA G+C content of 67.1 mol%. The phylogenetic and phylogenomic trees indicated that strain HZG-20 formed an independent and stable clade with RR4-56. However, the average nucleotide identity, DNA–DNA hybridization and average amino acid identity values between strain HZG-20 and RR4-56, NNCM2, P31 and X9-2-2 were 81.6, 71.1, 68.7 and 69.5%; 23.0, 18.5, 17.9 and 17.5%; and 78.2, 56.8, 56.5 and 61.9%, respectively, together with distinct chemotaxonomic features, indicating strain HZG-20 should not be assigned to known genera. As a result, a novel species of a novel genus within the family , designated as gen. nov., sp. nov., was proposed. The type strain is HZG-20 (MCCC 1K08468=KCTC 82692).

Funding
This study was supported by the:
  • Zhejiang Provincial Natural Science Foundation of China (Award LY24C010002 and LDT23D06025D06)
    • Principal Award Recipient: CongSun
  • National Natural Science Foundation of China (Award 32370006 and U23A2034)
    • Principal Award Recipient: CongSun
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2025-01-27
2026-04-18

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