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Holotype

/ˈhäləˌtīp/  /ˈhōlə-/

Noun, pl. holotypes

1. A single physical example (or illustration) of an organism, known to have been used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of several such, but explicitly designated as the holotype. (wikipedia.org)

2. The single physical example (or illustration) of an organism, known to be used when the taxon was formally described. (wiktionary.org)

3. A single specimen designated or indicated the type specimen by the original author at the time of publication of the original description. (biology-online.org)

4. A single type specimen upon which the description and name of a new species is based. (Google Dictionary)

5. The original specimen from which the description of a new species is made. (wordnetweb.princeton.edu)