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In a message dated 11/2/02 11:27:55 AM Pacific Standard Time, 
qilongia@yahoo.com writes:

<< At-a-glance estimates are crap, or just plain estimates. Sorry, but they
 did this in the old days, pre-Simpson and the like, before the detailed
 analysis of fossils and evolution were applied. It takes a detailed
 analysis to determine anything. >>

Not a genus, or, for that matter, any higher Linnaean category, provided only 
that you're not the proverbial man in the street but an interested and 
experienced naturalist. If such an individual has to do detailed analysis to 
distinguish populations of animals, the animals belong to the same genus, but 
maybe in different species of that genus.