Organisms - AMA Manual of Style

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Brenda Gregoline

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Capitalize the formal name of a genus when used in the singular, with or without a species name. Capitalize formal genus names but not traditional plural generic designations (eg, streptococci) or derived adjectives (streptococcal) (see also 9.4, Plurals, Microorganisms). Do not capitalize the name of a species, variety, or subspecies. Do capitalize phylum, class, order, or family (see 15.14, Nomenclature, Organisms and Pathogens). For capitalization of virus names, see 15.14.3, Nomenclature, Organisms and Pathogens, Virus and Prion Nomenclature.

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