In zoology, a trinomen, or trinominal name, refers to the name of a subspecies. "ICZN" redirects here It is also sometimes used for the International Code of Zoological Nomenclature in error In Zoology, as in other branches of Biology, subspecies is the Taxonomic rank immediately subordinate to a Species.

A trinomen is a name consisting of three names: generic name, specific name and subspecific name. In zoological nomenclature a specific name or specific epithet is the second part (second name in the name of a Species (a Binomen) In zoology, a subspecific name is the third part of a Trinomen. 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 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. The Great Cormorant ( Phalacrocorax carbo) known as the Great Black Cormorant across the Northern Hemisphere the Black Cormorant in Australia and the Australasia is a Region of Oceania: New Zealand, Australia, Papua New Guinea, and neighbouring Islands in the Pacific c. novaehollandiae".

In a taxonomic publication, a name is incomplete without an author citation and publication details. Taxonomy, sometimes alpha taxonomy, is the Science of finding describing and categorising Organisms thus giving rise to taxonomic groups or taxa This indicates who published the name; in what publication; with the date of the publication.

Phalacrocorax carbo novaehollandiae Stephens, 1826

It must be noted that 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 trinomial nomenclature was agreed upon, mainly due to its tireless promotion by Elliott Coues. The 18th century lasted from 1701 to 1800 in the Gregorian calendar, in accordance with the Anno Domini / Common Era numbering system The twentieth century of the Common Era began on Elliott Coues ( September 9, 1842 &ndash December 25, 1899) was an American army surgeon, Historian, Ornithologist See Allen (1884) for an example of the state of the debate and competing approaches in the late 19th century. The 19th century of the Common Era began on January 1, 1801 and ended on December 31, 1900, according to the Gregorian calendar Thus, when referring especially European works of the preceding era, remember that the nomenclature used is usually not in accord with contemporary standards.

See also

• binominal nomenclature
• in plants, an infraspecific taxon gets a three part name, a ternary name. In Botanical nomenclature, an infraspecific taxon is a taxon at a rank below that of species (i In botanical nomenclature the ICBN prescribes a "three part name" ( ternary name) for any taxon below the rank of species
• forms in zoological literature

References

• Allen, J. This article is not about formal Zoological nomenclature; it describes terms that are sometimes used but have no standing under the ICZN. A. (1884): Zoölogical [sic] Nomenclature. Auk 1(4): 338-353. The Auk is a quarterly Journal and the official publication of the American Ornithologists' Union, having been continuously published by that body since PDF fulltext

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