[quote name='Christian' date='Aug 3 2009, 04:46 AM' post='102018'
PS: Binomials aren't to be used because they're stable, but because they're more exact!
I can't argue with that, Christian, though I suspect that you and I will always differ on this subject.
One argument often used in the U.S, though, is that the use of a binomial enables two people in different parts of the country, say, to readily identify the taxon, whereas if they use different, regional, common names, there might be confusion. A popular example is the mountain lion that is variously called puma, catamount, panther, couger, painter, etc. The scientific name will eliminate that confusion, it is argued. But the scientific literature on this beast currently gives it two names on the genus level, Puma concolor and Felis concolor (I think that the latter is what you would call the "junior" synonym). This means that to keep up on current research (and this is a very important ecological species in this area, as Fish and Game managers are trying to artificially control the ratio of cougars to bighorn sheep by selecively killing the former), you have to use two different names, regardless of what is "exact."