Each of these main groups has been divided into categories equivalent to superorders
(with the suffix -omorpha uniformly applied) , unless the number of included genera is
too small to make subdivision advantageous. Subdivision to orders (with the suffix
-iformes uniformly applied) , in some cases to suborders (with the suffix -oidei) , and then
to families (with the suffix -idae) was made according to the same
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