Two Gram-stain-positive, motile, endospore-forming, facultatively anaerobic strains, designated MEBiC13591T
and
MEBiC13594T,
were isolated from tidal flat sediment of the Incheon City on the west coast of Korea. Growth of both
novel strains was observed at pH 5–9 (optimum, pH 7–7.5), and in 0–8% NaCl (optimum, 2% for MEBiC13591T
and
3% for MEBiC13594T).
Strains MEBiC13591T
and MEBiC13594T
grew optimally at 50 °C, (37.5–56.1 °C) and 44 °C
(20.7–50.7 °C), respectively. The main cellular fatty acids of strain MEBiC13591T
were iso-C15: 0, anteiso-C15: 0, iso-C16: 0,
iso-C17: 0 and anteiso-C17: 0, while those for strain MEBiC13594T
were C14:
0, iso-C14: 0, iso-C15: 0, anteiso-C15: 0 and C16:
0. In
both taxa, the major isoprenoid was MK-7. The genomic DNA G + C contents were 34.1 and 37.0 mol% for MEBiC13591T
and MEBiC13594T,
respectively. A 16S rRNA gene sequence analysis revealed that the novel strains showed high similarity
with members of the genera Aeribacillus (95.0%) and Caldibacillus (93.5–94.5%); however, showed lower than 90%
with Caldibacillus debilis TfT.
Phylogenetic and Phylogenomic analysis revealed that two novel strains comprised distinct
phyletic line with members formerly assigned to Caldibacillus. Based on genomic indices, such as AAI and ANI, members
formerly affiliated with Caldibacillus and Bacillus as well as the novel strains should be classified into five independent
genera. Based on the phenotypic, genomic and biochemical data, strains MEBiC13591T
and MEBiC13594T
represent two
novel species in the novel genus, for which the names Fervidibacillus albus gen. nov., sp. nov. (
MEBiC13591T [= KCCM
43317T
= KCTC 43181T
= JCM 33662T
= MCCC 1K04565T]),
and Fervidibacillus halotolerans sp. nov. (
MEBiC13594T
[= KCTC 43182T
= JCM 34001T])
are proposed. Three additional genera Caldifermentibacillus, Palidibacillus, and Perspicuibacillus
are also proposed by reclassification of the several species with valid names that formerly affiliated with the
genera Caldibacillus.
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