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Polynucleobacter is a genus of bacteria, originally established by Heckmann and Schmidt (1987) to exclusively harbor obligate endosymbionts of ciliates belonging to the genus Euplotes.
Limnohabitans is a genus of bacteria established by Hahn et al. (2010). The genus contains four species which all represent planktonic bacteria dwelling in the water column of freshwater lakes, reservoirs, and streams.
Limnohabitans curvus is an aerobic, nonmotile bacterium from the genus Limnohabitans and family Comamonadaceae, which was isolated from the pelagic zone from a freshwater lake in Mondsee in Austria.
Limnohabitans australis is an aerobic, nonmotile bacterium from the genus Limnohabitans and family Comamonadaceae, which was isolated from a freshwater pond in São Carlos, São Paulo state, Brazil.
Limnohabitans parvus is a Gram-negative, aerobic, oxidase- and catalase-positive, unpigmented, short-rod-shaped, nonmotile bacterium from the genus Limnohabitans, which was isolated with Limnohabitans planktonicus from the mesoeutrophic freshwater reservoir in Římov in the Czech Republic.
Polynucleobacter necessarius is a bacterium of the genus Polynucleobacter.
Polynucleobacter difficilis is an aerobic, catalase- and oxidase-positive, chemo-organotrophic, nonmotile, freshwater bacterium of the genus Polynucleobacter, isolated from the Lake Sevan from a depth of 60 m in Armenia.
Polynucleobacter rarus is an aerobic, chemo-organotrophic, catalase- and oxidase-positive, nonmotile bacterium of the genus Polynucleobacter, isolated from an acidic lake in Wisconsin.
Polynucleobacter asymbioticus is an aerobic, catalase- and oxidase-positive, chemo-organotrophic, nonmotile, free-living bacterium of the genus Polynucleobacter. The type strain was isolated from a small pond located in the Austrian Alps in the area of Salzburg and described as a new subspecies of Polynucleobacter necessarius in 2009. The classification of the type strain was hampered by the fact that its closest described relative represented obligate endosymbionts, i.e. P. necessarius, not available as a pure culture suitable for standard tests for delineation of prokaryotic species. Therefore, the strain was preliminarily placed in the subspecies P. necessarius subsp. asymbioticus. Later sequencing of the genome of the type strain revealed that the strain represented a novel species within the genus Polynucleobacter. Therefore, its taxonomic rank was lifted from the subspecies to the species level. Strains of P. asymbioticus dwell as planktonic organisms in acidic, humic-rich freshwater systems. Comparative genome analyses revealed that P. asymbioticus represents an atypical member of the family Burkholderiaceae regarding its small genome size and its passive lifestyle. A recent study used a collection of 37 P. asymbioticus strains isolated from various ponds located in a larger region of the Austrian Alps to gain insights in the evolution of Polynucleobacter bacteria.
Polynucleobacter wuianus is an aerobic, chemo-organotrophic, catalase- and oxidase-positive, free-living bacterium of the genus Polynucleobacter, isolated from a small pond located in the Austrian Alps in the area of Salzburg. Bacteria affiliated with this species represent planktonic bacteria (bacterioplankton) dwelling in acidic freshwater systems. The species was named after the Chinese limnologist and microbiologist Qinglong L. Wu who isolated the type strain.
The Silvanigrellales are an order of the phylum Bdellovibrionota. They include currently only the single family Silvanigrellaceae.
The Silvanigrellaceae are the only family of the order Silvanigrellales, of the class Oligoflexia, of the phylum Pseudomonadota. This family currently harbors the two genera Silvanigrella and Fluviispira
Silvanigrella aquatica is a bacterial species of the phylum Bdellovibrionota. The type strain was isolated from the small lake Nonnenmattweiher located in the Southern Black Forest in Germany. This species is currently the only species in the genus Silvanigrella, which is the only genus in the family Silvanigrellaceae, which is the only family in the order Silvanigrellales. The order Silvanigrellales is one of only two orders in the class Oligoflexia. The type strain MWH-Nonnen-W8red is remarkable due to its low GC content, its pigmentation and its plastic morphology. Of further interest is the relative close relationship of S. aquatica to "Spirobacillus cienkowskii" known as pathogens of daphnids (Daphnia), which are commonly called water fleas. However, S. aquatica is assumed to be a non-pathogenic free-living species. The genome of the type strain was sequenced,
Rhodoluna is a Gram-positive, non-spore-forming and non-motile genus of bacteria from the family of Microbacteriaceae. The type strain of the only species Rhodoluna lacicola encodes an actinorhodopsin, which is a light-diven proton pump enabling light energy conversion, potentially resulting in a mixotrophic physiology. The type strain of R. lacicola was isolated from Lake Tai in China. The type strain MWH-Ta8 is remarkable for its very small cell size ultramicrobacterium and its small genome size of only 1.4 Mbp. The type strain has a planktonic lifestyle, that is freely floating the water column of aquatic systems. Currently, the genus Rhodoluna contains two described species.
Polynucleobacter sphagniphilus is an aerobic, chemo-organotrophic, non-motile, free-living bacterium of the genus Polynucleobacter.
Aquirufa is a genus of red-pigmented freshwater bacteria affiliated with the family of Cytophagaceae.
Emcibacteraceae is a family of bacteria.
Bacteriovoracales is an order of bacteria.
References
- 1 2 3 Hahn MW, Schmidt J, Koll U, Rohde M, Verbarg S, Pitt A, Nakai R, Naganuma T, Lang E. (2017). "Silvanigrella aquatica gen. nov., sp. nov., isolated from a freshwater lake, description of Silvanigrellaceae fam. nov. and Silvanigrellales ord. nov., reclassification of the order Bdellovibrionales in the class Oligoflexia, reclassification of the families Bacteriovoracaceae and Halobacteriovoraceae in the new order Bacteriovoracales ord. nov., and reclassification of the family Pseudobacteriovoracaceae in the order Oligoflexales". Int J Syst Evol Microbiol. 67: 2555–2568. doi:10.1099/ijsem.0.001965. PMC 5627705 . PMID 28771119.
- ↑ Pitt A, Koll U, Schmidt J, Hahn MW. (2020). "Fluviispira multicolorata gen. nov., sp. nov. and Silvanigrella paludirubra sp. nov., isolated from freshwater habitats". Int J Syst Evol Microbiol. 70: 1630–1638.
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