Armatimonadota was originally described solely on the basis of environmental 16S rRNA gene clone sequences, and was temporarily titled candidate phylum OP10.

However, in 2011 a bacterial strain belonging to the phylum was isolated from an aquatic plant in Japan.

[2] Armatimonas rosea, an aerobic chemoheterotrophic bacterium, strain YO-36T, was isolated from rhizoplane of an aquatic plant (a reed, Phragmites australis) inhabiting a freshwater lake in Japan.

[2] Chthonomonas calidirosea, an aerobic, saccharolytic, obligately thermophilic, motile, non-spore-forming bacterium, strain T49(T), was isolated from geothermally heated soil at Hell's Gate, Tikitere, New Zealand.

Nitrosymbiomonas proteolytica" Chthonomonas calidirosea Armatimonas rosea Capsulimonas corticalis The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN)[10] and National Center for Biotechnology Information (NCBI).