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Preferred term



  • System of allocation of a nomen to a concept or class (such as a taxon) through pointing to an object being an example or member of the class (inclusive ostension), or a non-example or non-member of the class (exclusive ostension), or both (bidirectional ostension), without providing an intensional or closed extensional definition, or information on the boundaries the class. (Traditional term, definition in A. Dubois 2005b)

Bibliographic citation(s)

  • Dubois, A. (2005) Proposed Rules for the incorporation of nomina of higher-ranked zoological taxa in the International Code of Zoological Nomenclature. 1. Some general questions, concepts and terms of biological nomenclature. Zoosystema, 27 (2): 365–426.


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