Psychrobacter is a genus of Gram-negative, osmotolerant, oxidase-positive, psychrophilic or psychrotolerant, aerobic bacteria which belong to the family Moraxellaceae and the class Gammaproteobacteria. The shape is typically cocci or coccobacilli. Some of those bacteria were isolated from humans and can cause humans infections such as endocarditis and peritonitis. This genus of bacteria is able to grow at temperatures between −10 and 42 °C. Rudi Rossau found through DNA-rRNA hybridization analysis that Psychrobacter belongs to the Moraxellaceae. The first species was described by Juni and Heym. Psychrobacter occur in wide range of moist, cold saline habitats, but they also occur in warm and slightly saline habitats.
Psychrobacter aquaticus is a Gram-negative, psychrophilic, halotolerant, nonmotile bacterium of the genus Psychrobacter which was isolated from the McMurdo Dry Valley region of Antarctica.
Psychrobacter aquimaris is a Gram-negative, non-spore-forming, nonmotile bacterium of the genus Psychrobacter which was isolated from the South Sea in Korea.
Psychrobacter arenosus is a Gram-negative, psychrotolerant, aerobic, nonmotile bacterium of the genus Psychrobacter, which was isolated from coastal sea ice and sediment samples of the Sea of Japan.
Psychrobacter celer is a Gram-negative, slightly halophilic, non-spore-forming, nonmotile bacterium of the genus Psychrobacter, which was isolated from the South Sea in Korea.
Psychrobacter fulvigenes is a Gram-negative, oxidase- and catalase-positive, aerobic, non-spore-forming, nonmotile bacterium of the genus Psychrobacter, which was isolated from the Sea of Japan.
Psychrobacter lutiphocae is a Gram-negative, aerobic oxidase- and catalase-positive, non-spore-forming, nonmotile bacterium of the genus Psychrobacter, which was isolated from the faeces of a seal in Schleswig-Holstein in Germany.
Psychrobacter marincola is a Gram-negative, psychrophilic, moderately halophilic, aerobic oxidase- and catalase-positive, non-pigmented non-spore-forming, nonmotile bacterium of the genus Psychrobacter, which was isolated from the Indian Ocean.
Psychrobacter maritimus is a Gram-negative, aerobic oxidase- and catalase-positive, nonpigmented, non-spore-forming, nonmotile bacterium of the genus Psychrobacter, which was isolated from coastal sea ice and sediments of the Sea of Japan and in Russia.
Psychrobacter namhaensis is a Gram-negative, aerobic, non-spore-forming, slightly halophilic bacterium of the genus Psychrobacter, which was isolated from the South Sea in Korea.
Psychrobacter okhotskensis is a Gram-negative, catalase- and oxidase-positive, aerobic, facultatively psychrophilic, nonmotile bacterium of the genus Psychrobacter, which was isolated from seawater of the Monbetsu coast of the Okhotsk Sea in Hokkaido in Japan.
Psychrobacter pacificensis is a Gram-negative, aerobic, non-spore-forming, catalase- and oxidase-positive, psychrophilic, nonmotile bacterium of the genus Psychrobacter, which was isolated from 6000-m-deep seawater of the Japan Trench on the Hachijo Island in Japan.
Psychrobacter piscatorii is a Gram-negative, catalase- and oxidase-positive, psychrotolerant, nonmotile bacterium of the genus Psychrobacter, which was isolated from a fish-processing plant. The temperature where Psychrobacter piscatorii was isolated was about 8 °C.
Psychrobacter pulmonis is a Gram-negative, catalase- and oxidase-positive, strictly aerobic, nonmotile bacterium of the genus Psychrobacter, which was isolated from the lungs of lambs in Zaragoza in Spain. It is coccus-shaped; the type strain is S-606T.
Psychrobacter sanguinis is a Gram-negative, strictly aerobic bacterium of the genus Psychrobacter, which was isolated from human blood in New York.
Psychrobacter ciconiae is a Gram-negative, rod-shaped bacterium of the genus Psychrobacter, which was isolated from the stork Ciconia ciconia.
Psychrobacter oceani is a Gram-negative, strictly aerobic and nonmotile bacterium of the genus Psychrobacter, which was isolated from a sample of marine sediment from the Pacific Ocean.
Muricauda aquimarina is a Gram-negative, non-spore-forming and slightly halophilic bacterium from the genus of Muricauda. which has been isolated from a salt lake near the beach of Hwajinpo in Korea.
Cyclobacterium is a mesophilic, neutrophilic, chemoorganotrophic and aerobic bacterial genus from the family of Cyclobacteriaceae. Cyclobacterium bacteria occur in marine habitats
Lewinella is a Gram-negative, chemoorganotrophic and aerobic genus from the family Lewinellaceae.
