Bradymonabacteria, a novel bacterial predator group with versatile survival strategies in saline environments.

Background: Bacterial predation is an important selective force in microbial community structure and dynamics. However, only a limited number of predatory bacteria have been reported, and their predatory strategies and evolutionary adaptations remain elusive. We recently isolated a novel group of bacterial predators, Bradymonabacteria, representative of the novel order Bradymonadales in δ-Proteobacteria.

sp. nov., isolated from Arctic surface sediment.

A Gram-stain-negative, aerobic, non-motile, non-gliding, yellow-pigmented and rod-shaped bacterial strain, designated 1KV19, was isolated from a surface sediment sample collected near a bay in the Arctic. Growth of strain 1KV19 occurred in 1-4 % (w/v) NaCl (optimum, 2 %), at 4-35 °C (optimum, 25-30 °C) and at pH 6.5-8.

sp. nov., a novel helical bacterium isolated from a sea cucumber culture pond.

Strain F3212, Gram-stain-negative, aerobic, helical and motile bacterium, was isolated from the marine sediment collected in a sea cucumber culture pond located in Rongcheng, China. Strain F3212 grew optimally at pH 8.5, at 30 °C and in the presence of 3.

sp. nov., an agar-degrading marine bacterium isolated from red algae.

A Gram-stain-negative, aerobic and curved-rod-shaped bacterium, designated QM202, was isolated from red algae (). Cells of strain QM202 were 0.2-0.

Kineobactrum sediminis gen. nov., sp. nov., isolated from marine sediment.

A novel Gram-stain-negative, rod-shaped marine bacterium, designated strain F02, was isolated from a marine saltern in Weihai, PR China. The cells of strain F02 were approximately 0.8-1.

Oceanibium sediminis gen. nov., sp. nov., isolated from marine sediment.

A novel Gram-stain-negative, rod-shaped marine bacterium, designated as strain O448, was isolated from the coastal area of Weihai, China (122° 14' E, 36° 54' N). Cells of strain O448 were non-motile, aerobic, approximately 0.4-0.