 If punctuated equilibria (PE) was the first innovative idea about macroevolution to emerge during the 1970s, species selection followed close on its heels. Just how the two ideas are related is itself a topic of some philosophical interest (Turner 2010). According to Eldredge and Gould (1972), driven or directional change is only part of the theoretical story about the evolution of morphology; it is not, perhaps, even a geologically common narrative. Directional selection is selection that changes a population, pushing its distribution of traits from one pattern of trait expression to another. More typical, according the Eldredge and Gould, are cases of either non-directional change or even stasis. Like directional selection, nondirectional selection also changes a population, but not towards any particular distribution of traits—it just moves a population from one pattern to another. Stabilizing selection is selection that keeps a population the same, nudging it back to its trait distribution pattern whenever it starts to stray away. PE as originally formulated favors stabilizing selection, suggesting that both individuals and species are inherently stable homeostatic systems—systems that are “amazingly well-buffered to resist change and maintain stability in the face of disturbing influences” (Eldredge &amp; Gould 1972: 114). On this view, whatever the mechanisms that “resist change and maintain stability” are, they are in conflict with and must be overcome by directional natural selection in order for natural selection to successfully push for or “force” directional change. Whether natural selection is properly thought of as a force is itself an interesting philosophical issue (Sober 1984; Walsh 2000; Matthen &amp; Ariew 2002; Walsh, Lewens, &amp; Ariew 2002; Bouchard &amp; Rosenberg 2004; Stephens 2004; Brandon 2006; Millstein 2006; Filler 2009). Setting that question aside, however, allows us to consider the suggestion that species might be homeostatic systems which “resist change by self-regulation” (Eldredge &amp; Gould 1972: 114)—as this is a suggestion rife with implications for macroevolutionary theory.