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 alimentarius is a Gram-negative, non-spore-forming, nonmotile bacterium of the genus Psychrobacter which was isolated from squid jeotgal, a traditional Korean fermented seafood, in South 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 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 faecalis is a Gram-negative, oxidase-negative bacterium of the genus Psychrobacter, which was isolated from the bioaerosol of a room which was contaminated with pigeon faeces in Germany.
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 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 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 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 proteolyticus is a species of bacteria first isolated from the Antarctic krill Euphausia superba. It excretes a cold-adapted metalloprotease. It is a strictly aerobic, strongly oxidase-positive, psychrotrophic, halotolerant, Gram-negative nonmotile coccobacillus; its type strain is CIP106830T (=DSM13887).
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 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 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.
