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 aestuarii is a Gram-negative, strictly aerobic, non-spore-forming, nonmotile bacterium of the genus Psychrobacter which was isolated from tidal flat sediment in the South Sea in Korea.
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 cibarius is a Gram-negative, nonmotile bacterium of the genus Psychrobacter, which was isolated from jeotgal in Korea.
Psychrobacter fozii is a psychrophilic, oxidase-positive, halotolerant, Gram-negative, nonmotile coccobacillus with a strictly oxidative metabolism, first isolated from Antarctic environments. Its type strain is NF23T.
Psychrobacter frigidicola is a psychrophilic, oxidase-positive, halotolerant, Gram-negative, nonmotile bacterium of the genus Psychrobacter which was isolated from the Antarctic.
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 glacincola is a Gram-negative, oxidase- and catalase-positive, halotolerant, nonmotile bacterium of the genus Psychrobacter, which was isolated from the anchor ice of Amery Ice Shelf in Antarctica. It is strictly oxidative and coccus-shaped; its type strain is ACAM 483T.
Psychrobacter luti is a species of bacterium first isolated from Antarctic environments. It is a psychrophilic, oxidase-positive, halotolerant, Gram-negative, nonmotile coccobacillus with a strictly oxidative metabolism. Its type strain is NF11T.
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 phenylpyruvicus is a Gram-negative, catalase- and oxidase-positive, nonmotile bacterium of the genus Psychrobacter, which was isolated from human blood in Belgium. Psychrobacter phenylpyruvicus can cause humans infections such as endocarditis, peritonitis, and fungating lesion of the foot, but those infections caused by this bacterium are rare.
Psychrobacter salsus is a Gram-negative, strictly aerobic bacterium of the genus Psychrobacter, which was isolated from the fast ice in the middle of Geologie Archipelago in Adelie Land in Antarctica.
Psychrobacter vallis is a Gram-negative, psychrophilic, halotolerant, nonmotile bacterium of the genus Psychrobacter, which was isolated from cyanobacterial mat samples from the McMurdo Dry Valley region of Antarctica.
Psychrobacter piechaudii is a Gram-negative, non-spore-forming and on-motile bacterium from the genus of Psychrobacter.
