Technically you are correct. In that this is part of the rules for scientific names. Common names do not go by the same rules. However they do tend to follow those rules if possible and convenient, but this is a much greyer area. For example we talk of true moles or true magpies or true wrens or true warblers, as the creatures to whom those names are applied to first. In our society that is typically Europe or Britain. So we need to invent new names when we can, for the things that are in part named after those groups. With limited success. Of course it is nonsensical to the animals. There is nothing less valid about out Fairy-wrens compared to true Wrens etc. Why should one be true and the other not?
Philip
