Bacilli

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This article is about the bacterial class. For the genus, see Bacillus. For rod-shaped bacteria in general, see bacillus (shape).
Bacillus
Bacillus subtilis Gram.jpg
Bacillus subtilis, Gram stained
Scientific classification e
Domain: Bacteria
Phylum: Firmicutes
Class: Bacilli
Orders

Bacilli refers to a taxonomic class of bacteria. It includes two orders, Bacillales and Lactobacillales, which contain several well-known pathogens like Bacillus anthracis (the cause of anthrax).

Ambiguity[edit]

There are several related concepts that make use of similar words, and the ambiguity can create considerable confusion. The term "Bacillus" (capitalized and italicized) is also the name of a genus that, among many other genera, falls within the class Bacilli.

Also, "bacillus" (or the plural "bacilli") can be a generic term to describe the morphology of any rod-shaped bacterium. This general term does not mean that the subject is a member of class Bacilli or genus Bacillus. Thus, it does not necessarily imply a similar group of characteristics. Not all members of class Bacilli are rod-shaped (Staphylococcus is spherical), and many other rod-shaped bacteria that do not fall within that class (Clostridiumkamina dalla kotta is rod-shaped but very different taxonomically) exist. Moreover, the general term "bacillus" does not necessarily indicate the gram-positive staining common to class Bacilli. For example, E. coli is a rod-shaped bacterium that could, therefore, be described as "a bacillus," but it stains gram-negative and does not belong to genus Bacillus or class Bacilli. Some microbiologists have forsaken the general "bacillus" term because of the confusion it can create.

Phylogeny[edit]

The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LSPN) [1] [2] and the phylogeny is based on 16S rRNA-based LTP release 106 by 'The All-Species Living Tree' Project [3]

Bacilli

Alicyclobacillaceae [incl. Bacillus tusciae & Tumebacillus permanentifrigoris]





Calditerricola



Thermoactinomycetaceae






Bacillus schlegelii



Thermicanus aegyptius {Bacillales Family X. Incertae Sedis}





Caldalkalibacillus




Microanaerobacter





Bacillus species group 14



Paenibacillaceae 1





Bacillaceae 4 [incl. Pullulanibacillus naganoensis, Sinobaca qinghaiensis & Tuberibacillus calidus]




Vulcanibacillus




Bacillus species group 13




Bacillus species group 12 [incl. Anaerobacillus]




Bacillus species group 11




Bacillus species group 10





Bacillus taeanensis



Bacillaceae 3





Bacillus species group 9




Bacillus species group 8


Bacilli part 2

(continued)

















Unclassified Bacillales

Notes:
♠ Strains found at the National Center for Biotechnology Information (NCBI) but not listed in the List of Prokaryotic names with Standing in Nomenclature LPSN

Bacilli part 2 (continued)[edit]

Bacilli part 2


Bacillus species group 7




Bacillus species group 6





Bacillus species group 5 [incl. Aeribacillus pallidus]




Bacillus coagulans



Sporolactobacillaceae







Bacillus aeolius



Bacillaceae 2





Bacillus smithii




Bacillus badius




Exiguobacterium {Bacillales Family XII. Incertae Sedis}



Paenibacillaceae 2











Bacillus species group 4 [incl. Falsibacillus pallidus]





Bacillus species group 3



Bacillus





Bacillus species group 2





Bacillus species group 1




Jeotgalibacillus




Planococcaceae [incl. Acetobacter pasteurianus ascendens, Lysinibacillus, Psychrobacillus, Viridibacillus & various Bacillus sp.]







Bacillus coahuilensis




[[Staphylococcgay eae]]





Gemella {Bacillales Family XI. Incertae Sedis}


Aphragmobacteria

Turicibacter sanguinis




Haloplasma contractile




Erysipelotrichaceae [incl. Anaerorhabdus furcosa, Sharpea azabuensis, Streptococcus pleomorphus and various Clostridium, Eubacterium & Lactobacillus sp.]



Mollicutes







Lactobacillales










References[edit]

  1. ^ See the List of Prokaryotic names with Standing in Nomenclature. Data extracted from J.P. Euzéby. "Bacilli". Retrieved 2012-05-17. 
  2. ^ See the NCBI webpage on Bacilli Data extracted from Sayers et al. "NCBI Taxonomy Browser". National Center for Biotechnology Information. Retrieved 2012-05-17. 
  3. ^ See the 'The All-Species Living Tree' Project [1]. Data extracted from the "16S rRNA-based LTP release 106 (full tree)". Silva Comprehensive Ribosomal RNA Database. Retrieved 2012-05-17.