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Background  Extremophiles have attracted much attention in the last few decades, as they possess different properties by producing certain useful metabolites. However, the secondary metabolism of the extremophiles of Antarctic krill has received little attention.    Results  In this study, a new bacterial strain MSAK28401 T  from Antarctic krill was isolated and identified. The results of analysis on phenotypic, chemotaxonomic, and genomic characteristics showed that the strain MSAK28401 T  belongs to the genus  Planococcus . Cells of this strain were coccoid (0.89–1.05 μm) and aerobic. The majority of the fatty acid content was C 15:0  anteiso (37.67 ± 0.90%) followed by C 16:1  ω7c alcohol (10.37 ± 1.22%) and C 16:0  iso (9.36 ± 0.71%). The calculated average nucleotide identity and DNA–DNA hybridization values between the strain MSAK28401 T  and type strains  P. citreus  DSM 20549 T  and  P. rifietoensis  M8 T  were lower than 91 and 70%, respectively. The strain MSAK28401 T  (=KCTC 43283 T  and MCCC 1k05448 T ) represented a new member of the genus  Planococcus  and was named  P. alpniumensis  sp. nov. Moreover, genes involved in the degradation of aromatic compounds (e.g., salicylate, gentisate, and quinate) were found in the genome, implying that strain MSAK28401 T  has an aromatic compound as its potential metabolite. This work will help us understand the genomic characteristics and potential metabolic pathway of  Planococcus  from Antarctic krill.    Conclusions  This study reported the genomic information and phenotypic characteristics of the new strain  P. alpniumensis  MSAK28401 T  isolated from Antarctic krill, and provided the genome information of  Planococcus  strains for further studying the function roles in aromatic compound metabolism.    Supplementary Information  The online version contains supplementary material available at 10.1186/s12866-021-02347-3.

Whole genome sequencing and comparative genomic analyses of Planococcus alpniumensis MSAK28401T, a new species isolated from Antarctic krill