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UR 1264 - MYCSA : Mycologie et securite des aliments

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Mycologie & Sécurité des Aliments
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An article for highlighting consequences of allowing DNA sequence data as types of fungal taxa

29 May 2018

More than 400 mycologists, including P. Callac, reject proposals to modify the International Code of Nomenclature for algae, fungi, and plants (ICN), aimed at allowing DNA sequences without vouchered specimens to serve as types for fungal taxon names.

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Zamora JC, Svensson M., Kirschner R., Olariaga I., Ryman S., Parra L.A., Geml J., Rosling A…,.Callac P., …Ekman S. (2018). Considerations and consequences of allowing DNA sequence data as types of fungal taxa. IMA FUNGUS · 9(1): 167–175

Abstract: Nomenclatural type definitions are one of the most important concepts in biological nomenclature.
Being physical objects that can be re-studied by other researchers, types permanently link taxonomy (an artificial
agreement to classify biological diversity) with nomenclature (an artificial agreement to name biological diversity).
Two proposals to amend the International Code of Nomenclature for algae, fungi, and plants (ICN), allowing DNA
sequences alone (of any region and extent) to serve as types of taxon names for voucherless fungi (mainly putative
taxa from environmental DNA sequences), have been submitted to be voted on at the 11th International Mycological
Congress (Puerto Rico, July 2018). We consider various genetic processes affecting the distribution of alleles among
taxa and find that alleles may not consistently and uniquely represent the species within which they are contained.
Should the proposals be accepted, the meaning of nomenclatural types would change in a fundamental way from
physical objects as sources of data to the data themselves. Such changes are conducive to irreproducible science,
the potential typification on artefactual data, and massive creation of names with low information content, ultimately
causing nomenclatural instability and unnecessary work for future researchers that would stall future explorations
of fungal diversity. We conclude that the acceptance of DNA sequences alone as types of names of taxa, under the
terms used in the current proposals, is unnecessary and would not solve the problem of naming putative taxa known
only from DNA sequences in a scientifically defensible way. As an alternative, we highlight the use of formulas for
naming putative taxa (candidate taxa) that do not require any modification of the ICN.

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