RT Journal Article SR Electronic(1) A1 Najar, Ishfaq Nabi A1 Das, Sayak A1 Thakur, NagendraYR 2020 T1 Reclassification of Geobacillus galactosidasius and Geobacillus yumthangensis as Parageobacillus galactosidasius comb. nov. and Parageobacillus yumthangensis comb. nov., respectively JF International Journal of Systematic and Evolutionary Microbiology, VO 70 IS 12 SP 6518 OP 6523 DO https://doi.org/10.1099/ijsem.0.004550 PB Microbiology Society, SN 1466-5034, AB Members of the genus Geobacillus within the phylum Firmicutes are Gram-stain-positive, aerobic, endospore-forming, obligate thermophiles. In 2016, the genus Geobacillus was subdivided into two genera based on whole-genome approaches. The new genus, Parageobacillus , comprises five genomospecies. In this study, we recommend the reclassification of two Geobacillus species, Geobacillus galactosidasius and Geobacillus yumthangensis , into the genus Parageobacillus . We have applied whole genome approaches to estimate the phylogenetic relatedness among the 18 Geobacillus and Parageobacillus type strains for which genome sequences are currently publicly available. The phylogenomic metrics AAI (average amino acid identity), ANI (average nucleotide identity) and dDDH (digital DNA–DNA hybridization) denoted that the type strains of G. galactosidasius and G. yumthangensis belong to the genus Parageobacillus . Furthermore, a phylogeny based on comparison of the 16S rRNA gene sequences, recN gene sequences and core genes identified from the whole-genome analyses designated that the type strains of G. galactosidasius and G. yumthangensis belong in the genus Parageobacillus . With these findings, we consequently propose that G. galactosidasius and G. yumthangensis should be reclassified as Parageobacillus galactosidasius comb. nov. and Parageobacillus yumthangensis comb. nov., UL https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/ijsem.0.004550