The Department is led by the Secretary of State, who is nominated by the President and confirmed by the Senate and is a member of the Cabinet. The current Secretary of State is Rex Tillerson, beginning 1 February 2017.
â¢ Genus is the first name, and the species is the second name of a scientific name of any organism. â¢ Genus ranks higher compared to species in the hierarchy of taxonomy. â¢ Two fertile animals from one species can produce a fertile progeny, whereas two animals from one genus could or could not do so.hese two are the lowest considerable taxonomic levels, but rank above subspecies or breeds or types. However, many used to confuse the two terms, genus and species. Before understanding the difference between the two, it is important to know the meanings of genus and species, and this article follows that.
A species scientific name consists of two components (ie a binomen), the genus name and the species name. A subspecies scientific name consists of three components (ie a trinomen), the genus name, the species name and the subspecies name.All other names above the species level (eg Families) consist of one name. The Principles of zoological nomenclature. 2  Principle of binomial nomenclature.  3 The scientific name of a species, and not of a taxon of any other rank, is a combination of two names (a binomen), the first being the generic name and the second the specific name.