In zoology, a trinomen, or trinominal name, refers to the name of a subspecies. A trinomen is a name consisting of three names: generic name, specific name and subspecific name. All three names are typeset in italics, and only the generic name is capitalised. No indicator of rank is included: in zoology, subspecies is the only rank below that of species. » Buteo jamaicensis borealis is one of the subspecies of the red-tailed hawk. (Buteo jamaicensis). If the generic and specific name have alrea… (More on Trinomen)