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What is a punctuated equilibrium?

What is a punctuated equilibrium? Here are some definitions.

Noun
  1. A theory of evolution, holding that evolutionary change tends to be characterized by long periods of stability, or equilibrium, punctuated by episodes of very fast development.
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Examples
But again, I do not see that species selection follows from either punctuated equilibrium or the individuality of species.
According to Gould, the theory of punctuated equilibrium implies that species are individuals, not classes.
His best-known contribution to evolutionary biology was the theory of punctuated equilibrium that he developed with his colleague Niles Eldridge.
It's phyletic gradualism versus punctuated equilibrium.
The theory of punctuated equilibrium will come to be seen in proportion, as an interesting but minor wrinkle on the surface of Neo-Darwinian theory.
This is likely the pattern recognized in Niles Eldredge and Stephen Gould's punctuated equilibrium.

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