1887

Abstract

Representatives of the crenarchaeal genus are strictly anaerobic hyperthermophiles with an organotrophic type of metabolism. Since 1982, five species names have been validly published: , , , and . Recently, the genomic sequences of all five species became available, promoting the refinement of their taxonomic status. Analysis of full-length high-quality 16S rRNA gene sequences shows that the sequences of and are 100 % identical and differ by 2.2 % from those of , and The latter three sequences differ from each other by 0.1–0.3 % (99.9 % similarity in the pair and 99.7 % in the pairs involving ). prediction of DNA–DNA hybridization (DDH) values by comparison of genomes using 2.0 + at http://ggdc.dsmz.de/ produced results that correlated with the 16S rRNA gene sequence similarity values. In the and pairs, the predicted DDH values were 99 and 92 %, respectively, much higher than the recommended 70 % species-delimiting DDH value. Between members of different pairs, these values were no higher than 20 %. For , its predicted DDH values were around 70 % with and and no higher than 20 % with and . These results indicated that should be reclassified as a synonym of , whereas and should be reclassified as synonyms of

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2016-01-01
2020-02-18
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