Two species of the genus , namely Andersen 1993 and Holmes 1993, were simultaneously proposed and described in the same volume of , and have been maintained as heterotypic homonyms. However, the identical 16S rRNA gene sequence and high (99.1 %) average nucleotide identity (ANI) between the genome sequences of the two type strains implied that these two taxa should be united as a single genomic species. To clarify their taxonomic status, phenotypic properties including enzymic activities and substrate-utilization profiles were investigated. The results demonstrated that the two taxa have no pronounced differences and should constitute a single species. Therefore, the reclassification of Andersen 1993 as a later heterotypic synonym of Holmes 1993 is proposed.

This study was supported by the:
  • National Research Foundation of Korea (Award NRF-2013R1A1A3010041 and 2014-023335)
  • Korea University

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