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Bacilli is a taxonomic class of bacteria that includes two orders, Bacillales and Lactobacillales, which contain several well-known pathogens such as Bacillus anthracis. Bacilli are almost exclusively gram-positive bacteria.
The Clostridia are a highly polyphyletic class of Bacillota, including Clostridium and other similar genera. They are distinguished from the Bacilli by lacking aerobic respiration. They are obligate anaerobes and oxygen is toxic to them. Species of the class Clostridia are often but not always Gram-positive and have the ability to form spores. Studies show they are not a monophyletic group, and their relationships are not entirely certain. Currently, most are placed in a single order called Clostridiales, but this is not a natural group and is likely to be redefined in the future.
The Eubacteriales are an order of bacteria placed within the class Clostridia.
Desulfovibrionales are a taxonomic order of bacteria belonging to the phylum Thermodesulfobacteriota, with four families. They are Gram-negative. The majority are sulfate-reducing, with the exception of Lawsonia and Bilophila. All members of this order are obligately anaerobic. Most species are mesophilic, but some are moderate thermophiles.
The Halanaerobiales are an order of bacteria placed within the class Clostridia, and encompassing two families, the Halanaerobiaceae and the Halobacteroidaceae. Originally placed within the highly polyphyletic class Clostridia, according to the NCBI and LPSN, it is now thought to lie outside the Bacillota. Halanaerobiales are halophilic obligate anaerobes with a fermentative or homoacetogenic metabolism.
In the taxonomy of microorganisms, the Methanomicrobia are a class of the Euryarchaeota.
In taxonomy, Methanobacterium is a genus of the Methanobacteriaceae family of Archaea. Despite the name, this genus belongs not to the bacterial domain but the archaeal domain. Methanobacterium are nonmotile and live without oxygen. Some members of this genus can use formate to reduce methane; others live exclusively through the reduction of carbon dioxide with hydrogen. They are ubiquitous in some hot, low-oxygen environments, such as anaerobic digestors, their wastewater, and hot springs.
The Acidobacteriaceae are a family of Acidobacteriota.
'The All-Species Living Tree' Project is a collaboration between various academic groups/institutes, such as ARB, SILVA rRNA database project, and LPSN, with the aim of assembling a database of 16S rRNA sequences of all validly published species of Bacteria and Archaea. At one stage, 23S sequences were also collected, but this has since stopped.
Pandoraea is a genus of Gram-negative, non-spore-forming, motile bacteria with a single polar flagellum, of the family Burkholderiaceae and class Betaproteobacteria.
Desulfocapsa sulfexigens is a mesophilic, anaerobic, gram-negative bacterium. It disproportionates elemental sulfur and thiosulfate. SB164P1 is its type strain.
Diplocalyx is a genus of bacteria of the spirochete phylum. The genus was originally established in 1968 on the basis of differential morphology when compared to other spirochete species. No species within it has been successfully grown in culture. Up to now there is only on species of this genus known.
Desulfocapsa thiozymogenes is an anaerobic, gram-negative bacterium. It disproportionates elemental sulfur. It is the type species of its genus.
Jeotgalibacillus is a Gram-positive bacterial genus from the family Planococcaceae.
Desulfohalobium is a Gram negative, anaerobic, sulfate-reducing, moderately halophilic and rod-shaped bacterial genus from the family of Desulfovibrionaceae.
The Syntrophomonadaceae are a family of anaerobic bacteria in the order of Clostridiales. As a source of energy, these organisms uses carboxylic acids.
Syntrophomonas is a bacterial genus from the family of Syntrophomonadaceae.
The Micrococcales are an order of bacteria in the phylum Actinomycetota.
The Ignavibacteriales are an order of obligately anaerobic, non-photosynthetic bacteria that are closely related to the green sulfur bacteria.
