[Taxacom] Emendation / species splitting

[Anthony Pigott]

Dear All

Excuse my ignorance but could anyone please confirm or otherwise my
understanding of how best to represent the outcome of the following:

(1) A plant taxon  is named as the species Dus aus by Snooks with subspecies
aus, bus and cus. Dus bus is accepted as a synonym of the species Dus aus
but it is based on a different type.

(2) A paper is subsequently published by Buggins who declares that the three
original subspecies are each good species and should be called Dus aus, Dus
bus and Dus cus.

(3) A further paper is published by Snooks who now accepts that there are
three species. 

The taxon Dus aus Snooks [sensu Snooks(1)] is very different to Dus aus
Snooks [sensu Buggins and sensu Snooks(3)]. 

Is the best (right?) way to distinguish them referring to one as Dus aus
Snooks and Dus aus Snooks emend. Buggins?

Thanks

Anthony