How To Write Bacteria Nomenclature In Script . Learn that the last part of the scientific name is the species. It is in the feminine gender, the plural number, and written with an initial capital letter. Classification of bacteria based on Gram's Staining. Download from www.researchgate.net Nomencalture of bacteria scientific nomenclature according to scientific nomenclature, each bacteria is assigned two names (binomial nomenclature): The suffix word for a genus is virus. The genus and the species (pseudomonas aeruginosa).