tautonym

It is a tautonym of the head.

Other terms that are occasionally used include cloning, doubling, duplication, repetition, and tautonym.

This is known as a tautonym.

One example of a botanical tautonym is 'Larix larix'.

In general English, a tautonym is sometimes considered to be any word or term made from two identical parts or syllables, such as bonbon or dada.

Cheadle, for example, is generally reckoned a tautonym, with the Old English leah, also meaning a wood, glossing the original Celtic term.

Patouillard had originally named the genus Melaleuca in 1887 and called the type species Melaleuca vulgaris, presumably to avoid a tautonym.

Petersen suggests that Berkeley may have foreseen the necessity to avoid giving the species a tautonym (a situation where both the generic name and specific epithet are identical).

His new genus name prevailed, and when Tommaso Salvadori combined it with the earlier specific name in 1891, it became a tautonym (where the two names are identical).

In biology, tautonym is an informal term to indicate a scientific name of a species in which both parts of the name have the same spelling, for example Bison bison.

His proposed name would have created a tautonym, not acceptable under the rules (from 1906 onwards; the rules are retroactive): it does not and cannot exist (as a formal name).

The black rat was one of the many species originally described by Linnaeus in his 18th century work, Systema Naturae, and it still bears its original tautonym of Rattus rattus.

In past editions of the zoological Code the term tautonym was used, but it has now been replaced by the more inclusive "tautonymous names"; these include trinomial names such as Gorilla gorilla gorilla.

The ICN, the plant Code, does not allow the two parts of a binomial name to be the same (such a name is called a tautonym), whereas the ICZN, the animal Code, does.

If the combination is normal, we shall say that the lexical units involved are philonyms ; if the combination is pleonastic, we shall speak of head and tautonym ; if dissonance results, the lexical units will be labelled xenonyms.

However, because of Miller's slightly different spelling, the combination correctly using the earliest species name (from Linnaeus) with the new genus, Ziziphus zizyphus, is not a tautonym, and was therefore permitted as a botanical name; this combination was made by Hermann Karsten in 1882.

The species names of common animals are often identical to their genus names (as with Rattus rattus or Bufo bufo), but this form of designation (known as a tautonym) is forbidden for plants and fungi by the International Code of Nomenclature.

Otto Kuntze and Howard James Banker later independently sought to restore Linnaeus' species name, but the resulting combination (Auriscalpium auriscalpium) is a tautonym and disallowed under the rules for botanical nomenclature (ICBN 2005 rule 23.4), and these combinations are therefore no longer validly published.