intrasporangium calvum intrasporangium calvum intrasporangium calvum is a species of gram positive, aerobic, endospore-forming bacteria. the species was initially isolated from air in a school dining room in the soviet union. the species was first described in 1967, and was the first and only species in the genus intrasporangium until 2012. intrasporangium calvum scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: micrococcales family: intrasporangiaceae genus: intrasporangium species: i. calvum binomial name intrasporangium calvumkalakoutskii et al. 1967 i. calvum can grow in the 20-40 °c range, and can grow in ph 6.0-8.0.