Reclassification of Halothiobacillus hydrothermalis and Halothiobacillus halophilus to Guyparkeria gen. nov. in the Thioalkalibacteraceae fam. nov., with emended descriptions of the genus Halothiobacillus and family Halothiobacillaceae

Rich Boden*

*Corresponding author for this work

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Abstract

The genus Halothiobacillus contains four species of obligate autotrophs with validly published names, of which Halothiobacillus halophilus and Halothiobacillus hydrothermalis are very distant from the type species – on the basis of the 16S rRNA gene, they have 90.7 % and 90.9 % identity to that of the type species, Halothiobacillus neapolitanus . As these values fall below the Yarza cut-off for the rank of genus, and these two species also show no clear affiliation to the closely related genus Thioalkalibacter , a polyphasic study was undertaken to determine if they represent a separate genus. Unlike Halothiobacillus spp. sensu stricto, H. halophilus and H. hydrothermalis are halophilic (rather than halotolerant) and moderately alkaliphilic (rather than neutrophilic) and additionally do not produce tetrathionate as a detectable intermediate of thiosulfate metabolism, indicating some significant metabolic differences. On the basis of these data and of functional gene examination, it is proposed that they be circumscribed as a new genus Guyparkeria gen.nov, for which the type species is Guyparkeria halophila gen. nov., comb. nov. Additionally, Thioalkalibacter and Guyparkeria gen. nov. fall distant from the Halothiobacillaceae so the Thioalkalibacteraceae fam. nov. is proposed, for which Thioalkalibacter is the type genus. Emended descriptions of Halothiobacillus , Halothiobacillus neapolitanus and the Halothiobacillaceae are provided.
Original languageEnglish
Number of pages0
JournalInternational Journal of Systematic and Evolutionary Microbiology
Volume0
Issue number0
Early online date8 Sept 2017
DOIs
Publication statusPublished - 8 Sept 2017

Keywords

  • halophiles
  • Guyparkeria
  • Halothiobacillus
  • Thioalkalibacter
  • Thioalkalibacteraceae
  • Thiobacillus
  • Autotroph
  • Gammaproteobacteria

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