Are molecular discoveries considered valid enough to allow changing of a taxonomic name, or rearranging of a taxon?
There are no rules. Anybody can change taxonomic names for whatever reasons they feel justify the change. If they did poor work others will ignore it or change it back, hopefully. Typically people describe new species based on morphological data, in question 12 you are given a more modern circumstance in which you have molecular data. The type of data one uses to do taxonomy doesn’t matter – it’s the conclusions you draw from the analysis of the data that matter.
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