Roseomonas
Roseomonas is a genus of Gram negative bacteria. The cells are coccoid rods when viewed microscopically. Certain species are known to be opportunistic infections for humans. Background. The first species isolated had pink colonies when grown on agar, which led to the naming of the genus (from Latin "roseus", pink). ""Roseomonas" species have been isolated frequently from blood, wounds, exudates, abscesses and genitourinary specimens," and have been isolated from environmental sources. "Roseomonas" can cause bacteremia in humans, especially in immunocompromised patients. While uncommon, the reported rate of "Roseomonas" infection may be lower due to difficulty in detection of the  bacteria in clinical settings. The first species of "Roseomonas" were identified when 42 strains of pink-pigmented bacteria from various clinical sources were examined. While similar to characteristics of genus "Methylobacterium", the strains were found to contain three new species of a previously unidentified genus, which led to the creation of genus "Roseomonas". Almost all species of "Roseomonas" are mesophiles. However, "R. alkaliterrae" is a thermophile, with an optimum growth range of 40-50 °C. Six species are psychrotrophic (i.e. can grow at or below 7 °C): "R. aerilata", "R. aerophila", "R. alkaliterrae", "R. arctica", "R. oryzae", and  R. vinacea. Reclassified species. "R. ludipueritiae" and "R. rosea" were originally classified as "Teichococcus ludipueritiae" and "Muricoccus roseus" respectively, but further study on the organisms led to them being reclassified in genus "Roseomonas". "Roseomonas fauriae" was one of the first species classified as "Roseomonas". However, further studies found that "R. fauriae" was a strain of "Azospirillum brasilense", and did not belong in the genus "Roseomonas". Distribution. The original species of "Roseomonas", "Roseomonas gilardii", "R. mucosa", and "R. cervicalis" were first isolated from blood and human infections, and were likely opportunistic infections. Further discoveries of "Roseomonas" species were from a variety  of environmental sources, including soil, freshwater sediment, plants, water, air, and environmental surfaces. The following is a list of locations from which the species were first isolated: Air Freshwater sediment Plants Soil Surfaces Water Colony color. Most species of "Roseomonas" form pink to light red pigmented colonies when grown on culture medium. However, some species form colonies of different colors: Red White Yellow, orange, or brown