Speculative and Disputed
"The earliest and most primitive members of every order already have the basic ordinal characters, and in no case is an approximately continuous series from one order to another known.
In most cases the break is so sharp and the gap so large that the origin of the order is speculative and much disputed."| | George Gaylord Simpson,
Temp. and Mode in Evolution (NY: Columbia University Press, 1944), p. 105–106. |
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