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I think the main issue is that the name given to it by the author is the valid one ... not whether they understood latin enough to get the correct suffix ;) The names are not latin or greek words - they are names assigned to them by taxonomists ... some of whom understand languages and the rules of nomenclature better than others. There are many examples of *MYA and *MYIA names in Diptera.

I think in some cases names have been 'corrected' but I am not sure if this is common practice and whether it carries precedence over the original name.