DIACRITIC MARKS

Diacritic marks are the marks, ie apostrophes or diaereses, traditionally used with certain words.

However, there is a rule under which these are not to be used in a taxonomic name and are to be deleted from such names originally published with them.

The rule says that the German umlaut sign deleted from a vowel should be replaced by e inserted after the vowel, but only for taxonomic names based on German words and published before 1985.