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In a message dated 11/25/02 3:40:57 AM Pacific Standard Time, 
qilongia@yahoo.com writes:

<< At-a-glance is a testable theory, and applying it to the data (extant
 forms) falsifies the theory. Whatever Thomas Jefferson could do atop his
 horse is the layman's concept of superficiality. Taxa are not superficial,
 and deciding a rank based on something superficial just shows how far it
 is from Science. T. Jefferson's horse isn't very scientific, and having
 stripes doesn't make the quagga a zebra, just a funny-looking equine,
 despite Victorian at-a-glance systematics. >>

At-a-glance is not meant to be a hard-and-fast law of taxonomy, of course, 
merely a recommendation about how to separate genera if and when no other 
rules apply. I would have thought that was understood.