The Veillonellaceae are a family of the Clostridia, formerly known as Acidaminococcaceae. Bacteria in this family are grouped together mainly based on genetic studies, which place them among the Bacillota. Supporting this placement, several species are capable of forming endospores. However, they differ from most other Bacillota in having Gram-negative stains. The cell wall composition is peculiar.
The Negativicutes are a class of bacteria in the phylum Bacillota, whose members have a peculiar cell wall with a lipopolysaccharide outer membrane which stains gram-negative, unlike most other members of the Bacillota. Although several neighbouring Clostridia species also stain gram-negative, the proteins responsible for the unusual diderm structure of the Negativicutes may have actually been laterally acquired from Pseudomonadota. Additional research is required to confirm the origin of the diderm cell envelope in the Negativicutes.
The Selenomonadales are an order of bacteria within the class Negativicutes; unlike most other members of Bacillota, they are Gram-negative. The phylogeny of this order was initially determined by 16S rRNA comparisons. More recently, molecular markers in the form of conserved signature indels (CSIs) have been found specific for all Selenomonadales species. On the basis of these markers, the Selenomonadales are inclusive of two distinct families, and are no longer the sole order within the Negativicutes. Several CSIs have also been found specific for both families, Sporomusaceae and Selenomonadceae. Samples of bacterial strains within this order have been isolated from the root canals of healthy human teeth.
Cyclobacterium is a mesophilic, neutrophilic, chemoorganotrophic and aerobic bacterial genus from the family of Cyclobacteriaceae. Cyclobacterium bacteria occur in marine habitats
Gabonibacter massiliensis is a bacterium from the genus of Gabonibacter which has been isolated from the human gut microbiota.
Globicatella sulfidifaciens is a Gram-positive bacteria from the family of Globicatella which has been isolated from the lungs of cattle and lambs in Belgium. It is associated with purulent infections of domestic mammals and urinary tracts of swine. Unlike other Globicatella species and species of related genera, G. sulfidifaciens is PYR negative. Globicatella sulfidifaciens bacteria are resistant against the antibiotics neomycin, erythromycin and clindamycin.
Oribacterium is a strictly anaerobic and non-spore-forming bacterial genus from the family of Lachnospiraceae.
Caloranaerobacter is a Gram-negative, thermophilic, anaerobic and chemoorganotrophic bacterial genus from the family of Clostridiaceae.
Allisonella is a Gram-negative, ovoid-shaped, histamine-producing and non-motile genus of bacteria from the family of Veillonellaceae with one known species. Allisonella is named after the American microbiologist M. J. Allison.
Anaeroglobus is a Gram-negative, cocci, non-spore-forming, anaerobic and non-motile genus of bacteria from the family of Veillonellaceae with one known species.
Negativicoccus succinicivorans is a Gram-negative and anaerobic bacterium from the genus of Negativicoccus which has been isolated from a human toe wound in France.
Olsenella is a Gram-positive, non-spore-forming, obligate anaerobic and non-motile bacterial genus from the family Atopobiaceae. Olsenella is named after the microbiologist Ingar Olsen. Olsenella bacteria are involved in endodontic infections in humans.
Sediminibacillus is a genus of bacteria from the family of Bacillaceae. Sediminibacillus species are halophilic bacteria and found in salty human stools and marine sponges. Sediminibacillus species are identified from Plakortis dariae sponge of the Saint Martin's island of the Bay of Bengal, Bangladesh.
Anaerolineaceae is a family of bacteria from the order of Anaerolineales. Anaerolineaceae bacteria occur in marine sediments. There are a total of twelve genera in this family, most of which only encompass one species. All known members of the family are Gram-negative and non-motile. They also do not form bacterial spores and are either mesophilic or thermophilic obligate anaerobes. It is also known that all species in this family are chemoheterotrophs.
Leptolinea is a bacteria genus from the family of Anaerolineaceae with one known species.
Eisenbergiella is a genus of bacteria from the family of Lachnospiraceae.
Cetobacterium is a Gram-negative, pleomorphic, non-spore-forming, rod-shaped and non-motile genus of bacteria from the family of Fusobacteriaceae.
Lebetimonas is a genus of bacteria from the family Nautiliaceae.
Necropsobacter is a Gram-negative and non-motile genus of bacteria from the family of Pasteurellaceae.
Jonquetella is a Gram-negative and strictly aerobic genus of bacteria from the family of Synergistaceae with one known species. Jonquetella anthropi has been isolated from a human cyst from Montpellier in France.
