Three psychrophilic bacteria strains (SQ149, SQ345, and S1-1) were isolated from deep-sea sediments in the South China Sea and showed high similarity to strain RZG4-3-1 based on 16S rRNA gene sequences (96.45 to 96.67%).
Phylogenetic and genetic analyses indicated that these strains form a distinct cluster and represent novel species, as their genetic markers fall below the species delimitation thresholds.
All strains are Gram-negative, rod-shaped, and contain specific fatty acids, respiratory quinones, and polar lipids, leading to their classification as new species within the genus, with proposed names for each strain.