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This article is about the naming of animals. For the naming of plants and fungi, see Infraspecific name (botany).

In zoological nomenclature, a trinomen (plural: trinomina), or trinominal name, or ternary name, refers to the name of a subspecies, for example: Homo sapiens sapiens.

A trinomen is a name consisting of three names: generic name, specific name and subspecific name. The first two parts alone form the binomen or species name. All three names are typeset in italics, and only the first letter of 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 already been mentioned in the same paragraph, they are often abbreviated to initial letters: for example one might write, "The Great Cormorant Phalacrocorax carbo has a distinct subspecies in Australasia, the Black Shag P. c. novaehollandiae".

In a taxonomic publication, a name is incomplete without an author citation and publication details. This indicates who published the name; in what publication; with the date of the publication.

Phalacrocorax carbo novaehollandiae Stephens, 1826

While binomial nomenclature came into being and immediately gained widespread acceptance in the mid-18th century, it was not until the early 20th century that the current unified standard of trinominal nomenclature was agreed upon, mainly because of its tireless promotion by Elliott Coues – even though trinomina in the modern usage were pioneered in 1828 by Carl Friedrich Bruch and around 1850 widely used especially by Hermann Schlegel and John Cassin. As late as the 1930s, the use of trinomina was not fully established in all fields of zoology.[1][2] Thus, when referring especially European works of the preceding era, the nomenclature used is usually not in accord with contemporary standards.

See also[edit]


  1. ^ Allen, J.A. (1884). "Zoölogical Nomenclature" (PDF). Auk 1 (4): 338–353. doi:10.2307/4067227. 
  2. ^ Stresemann, Ernst (1936). "The Formenkreis-Theory" (PDF). Auk 53 (2): 150–158. doi:10.2307/4077273.