Actinomycetales are generally gram-positive and anaerobic and have mycelia in a filamentous and branching growth pattern.

Streptomycin, actinomycin, and streptothricin are all medically important antibiotics isolated from Actinomycetes bacteria.

[4] The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN)[2] and National Center for Biotechnology Information (NCBI)[5] "Tropherymataceae" Microbacteriaceae "Quadrisphaeraceae" [incl.

"Kineococcaceae"; "Quadrisphaeraceae"] Aquipuribacteraceae Georgenia Promicromonosporaceae Beutenbergiaceae Bogoriellaceae Ruaniaceae Actinomycetaceae [incl.

Arsenicicoccaceae] Dermacoccaceae Kytococcaceae Ornithinimicrobiaceae Intrasporangiaceae Demequinaceae Dermabacteraceae Micrococcaceae [incl.

Aquipuribacteraceae; Arsenicicoccaceae; Dermacoccaceae; Kytococcaceae; Ornithinimicrobiaceae; Intrasporangiaceae] Demequinaceae Cellulomonadaceae [incl.