Halorubrum chaoviator Mancinelli et al. 2009 is a later, heterotypic synonym of Halorubrum ezzemoulense Kharroub et al. 2006. Emended description of Halorubrum ezzemoulense Kharroub et al. 2006
2018
A polyphasic comparative taxonomic study of
Halorubrum ezzemoulense
Kharroub et al. 2006,
Halorubrum chaoviator
Mancinelli et al. 2009 and eight new
Halorubrum
strains related to these haloarchaeal species was carried out. Multilocus sequence analysis using the five concatenated housekeeping genes atpB, EF-2, glnA, ppsA and rpoB′, and phylogenetic analysis based on the 757 core protein sequences obtained from their genomes showed that Hrr. ezzemoulense DSM 17463T, Hrr. chaoviator Halo-G*T (=DSM 19316T) and the eight
Halorubrum
strains formed a robust cluster, clearly separated from the remaining species of the genus
Halorubrum
. The orthoANI value and digital DNA–DNA hybridization value, calculated by the Genome-to-Genome Distance Calculator (GGDC), showed percentages among Hrr. ezzemoulense DSM 17463T, Hrr. chaoviator DSM 19316T and the eight
Halorubrum
strains ranging from 99.4 to 97.9 %, and from 95.0 to 74.2 %, respectively, while these values for those strains and the type strains of the most closely related species of
Halorubrum
were 88.7–77.4 % and 36.1–22.3 %, respectively. Although some differences were observed, the phenotypic and polar lipid profiles were quite similar for all the strains studied. Overall, these data show that Hrr. ezzemoulense, Hrr. chaoviator and the eight new
Halorubrum
isolates constitute a single species. Thus,
Hrr. chaoviator
should be considered as a later, heterotypic synonym of
Hrr. ezzemoulense
. We propose an emended description of
Hrr. ezzemoulense
, including the features of
Hrr. chaoviator
and those of the eight new isolates.
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