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 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 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 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 nivimaris is a Gram-negative, oxidase- and catalase-positive, aerobic, nonmotile bacterium of the genus Psychrobacter, which was isolated from the Southern Ocean.
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 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 submarinus is a Gram-negative, oxidase- and catalase-positive, psychrophilic, halophilic nonmotile aerobic bacterium of the genus Psychrobacter, which was isolated from seawater at a depth of 300 m from the Pacific Ocean.
Psychrobacter ciconiae is a Gram-negative, rod-shaped bacterium of the genus Psychrobacter, which was isolated from the stork Ciconia ciconia.
