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Scanning electron micrograph of Actinomyces israelii.
Scientific classification
Kingdom: Bacteria
Phylum: Actinobacteria
Class: Actinobacteria
Subclass: Actinobacteridae
Order: Actinomycetales
Buchanan, 1917

Actinomycetales is an order of Actinobacteria. They are very diverse and contain a variety of subdivisions as well as yet-unclassified isolates. This is mainly because some genera are very difficult to classify because of a highly niche-dependent phenotype. For example Nocardia contains several phenotypes that were first believed to be distinct species before it was proven that their differences are entirely dependent on their growth conditions.

Difficulty of classification[edit]

Actinomycetales are Gram-positive, however several species have complex cell wall structures that make the gram staining unsuitable. Examples: Mycobacteriaceae.