According to the current version of Rule 12c of the International Code of Nomenclature of Prokaryotes, one of the ways in which a specific epithet can be treated is as an adjective that must agree in gender with the generic name. I propose emending this part of Rule 12c to specify that such adjectives must be in the singular form in the nominative case.

Keyword(s): grammatical case , ICNP and species names

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