bacillus nealsonii bacillus nealsonii bacillus nealsonii is a species of bacteria first isolated from a spacecraft-assembly facility. its spores are γ-radiation resistant. it is gram-positive, facultatively anaerobic, rod-shaped and produces endospores. its type strain is fo-92t (=atcc baa-519t =dsm 15077t). bacillus nealsonii scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: bacillaceae genus: bacillus species: b. nealsonii binomial name bacillus nealsoniivenkateswaran et al. 2003 this species has been recently transferred into the genus niallia. the correct nomenclature is niallia nealsonii.