Actinomycetales

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

Difficulty of classification

Actinomycetales are Gram-positive, but several species have complex cell wall structures that make the Gram staining unsuitable (e.g. Mycobacteriaceae).

References</h2>

• See the NCBI webpage on Actinomycetales Data extracted from the "NCBI Taxonomy Browser". National Center for Biotechnology Information. Retrieved 2011-06-05. 
• J.P. Euzéby. "Actinomycetales". List of Prokaryotic names with Standing in Nomenclature. Archived from the original on 13 June 2011. Retrieved 2011-06-11. 
• Labeda et al. (2011). "Abstract of Reassessment of the systematics of the suborder Pseudonocardineae: transfer of the genera within the family Actinosynnemataceae Labeda and Kroppenstedt 2000 emend. Zhi et al. 2009 into an emended family Pseudonocardiaceae Embley et al. 1989 emend. Zhi et al. 2009". International Journal of Systematic Evolutionary Microbiology vol. 61. pp. 1259â€"1264. Retrieved 2011-06-11.  CS1 maint: Explicit use of et al. (link)

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