TL;DR
Comparative investigations of phenotype and phylogenomics indicate that strain FM0494T is a novel representative of the genus Rossellomorea, and the name Rossellomorea contaminans sp.
On the basis of evidence presented in this study, strain BYT-45T represents a novel species of the genus Shinella, for which the name Shinella agrisoli sp.
On the basis of the combined phenotypic, chemotaxonomic, phylogenetic and genomic evidence, strain GXG 6511T is considered to represent a novel species of the genus Ammonicoccus, for which the name Ammonicoccus luteus sp.
Based on further phenotypic, genomic, and phylogenetic analysis, strain F2T represents a novel genus and species within the family Anaerovoracaceae with the proposed name Peptonella octanoica gen. sp.
Genome analysis identified genetic features potentially associated with stress adaptation and iron/tryptophan metabolism, providing additional ecological context for this plant-associated isolate.
Genomic comparisons, morphological, physiological, biochemical and chemotaxonomic data supported its differentiation from closely related species and a new species, Parasedimentitalea nitratireducens sp.
Abstract A novel psychrophilic member of the phylum Actinomycetota, designated strain CPHL_1T, was isolated from the shoreline of Cape Hallett, Antarctica. Cells were Gram-positive, aerobic, non-motile, non-spore-forming rods (0.7–1.0 µm in length) with orange to yellow pigmentation. Optimal growth occurred at 15 °C, pH 8.0, with NaCl tolerance up to 3% (w/v). Strain CPHL_1T exhibited cytosolic cold-active β-galactosidase activity, with an optimum at 15 °C and pH 7.0 and formed non-adherent biofilms. Phylogenetic analysis based on 16S rRNA gene sequence placed the strain within the genus Rhodoglobus, showing high similarity to Rhodoglobus vestalii LV3T (99.4%) and Rhodoglobus aureus CMS 81yT (97.6%). Chemotaxonomic characteristics, including the predominance of anteiso-C15 : 0, anteiso-C17 : 0 and iso-C16 : 0 fatty acids, the presence of MK-11, MK-10 and MK-12 as the major respiratory quinones, and genomic G+C content of 60%, further supported its assignment to the genus Rhodoglobus. Whole-genome comparisons revealed clear taxonomic distinction, with strain CPHL_1T sharing 88.9% average nucleotide identity (ANI) and 38.3% digital DNA–DNA hybridization (dDDH) values with R. aureus, and 81.7% ANI and 25.1% dDDH with R. vestalii, confirming its status as a novel species. Phylogenetic analysis revealed that the β-galactosidases from these Rhodoglobus strains form a well-supported clade with high sequence similarity. Based on these data, a novel species is proposed: Rhodoglobus galactosidasius sp. nov. (type strain CPHL_1T =ITEM 19986T =KCTC 59592T). Genomic analyses also highlighted its biosynthetic potential for specialized metabolites, consistent with the recognized metabolic diversity of the genus.
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