nocardioidaceae nocardioidaceae nocardioidaceae is a family of gram-positive bacteria within the class actinomycetia. nocardioidaceae scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: propionibacteriales family: nocardioidaceaenesterenko et al. 1990 type genus nocardioidesprauser 1976 (approved lists 1980) genera aeromicrobium miller et al. 1991 marmoricola urzì et al. 2000 mumia lee et al. 2014 solicola lopez marin et al. 2023 nocardioides prauser 1976 (approved lists 1980)