Chapter 13: The Type Concept in Nomenclature


Article 61. Principle of Typification.

61.1. Statement of the Principle of Typification. Each nominal taxon in the family, genus or species groups has actually or potentially a name-bearing type. The fixation of the name-bearing type of a nominal taxon provides the objective standard of reference for the application of the name it bears.

61.2. Name-bearing types of nominotypical taxa. The name-bearing type of a nominal taxon is also the name-bearing type of its nominotypical taxon [Arts. 37.1, 44.1, 47.1], and the fixation of a name-bearing type for one constitutes fixation for the other also.

61.3. Name-bearing types and synonymy.

61.4. Designation of a subgenus or subspecies as a name-bearing type. If a nominal subgenus is fixed as the name-bearing type of a nominal family-group taxon, it is deemed to have been raised first to the rank of genus. If a nominal subspecies is fixed as the name-bearing type of a nominal genus-group taxon, it is deemed to have been raised first to the rank of species.

Example. Planigale Troughton, 1928 (Mammalia) was established with the species P. subtilissima (Lönnberg, 1913), P. tenuirostris Troughton, 1928 and P. ingrami (Thomas, 1906) and the subspecies P. ingrami brunnea Troughton, 1928. In the original description, the latter "subspecies of ingrami" was designated the type of Planigale by the term "Genotype". P. brunnea Troughton, 1928 is the type species by original designation, not P. ingrami (Thomas, 1906).


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