 One other philosophical issue raised by PE concerns the explanation of evolutionary stasis (Turner 2017). Eldredge and Gould never really offered a very clear account of the mechanism(s) that could maintain stasis, a fact that critics often seized upon (e.g., Coyne &amp; Charlesworth 1996). They did propose that species might be homeostatic systems. To make matters worse, there is a mismatch between the fossil evidence (where stasis is common) and studies of extant populations that show lots of directional evolutionary change (Price, Grant, Gibbs, &amp; Boag 1984; Endler 1986; Lenski &amp; Travisano 1994; Harshman &amp; Hoffmann 2000), a puzzle sometimes called the “paradox of stasis” (Hendry 2007). Many evolutionary biologists (e.g. Estes and Arnold 2007) are quick to attribute stasis at larger scales to well-known processes such as stabilizing selection and/or habitat tracking, but Kaplan (2009) raises some critical questions about that move. And Sterelny (2001b) has pointed out that cases of “coordinated stasis” in the fossil record pose special explanatory challenges. Coordinated stasis is a pattern where a whole ecological assemblage seems to persist without change for millions of years. Stasis, the idea at the heart of PE, remains an issue of considerable theoretical and empirical interest in paleontology (Lidgard &amp; Hopkins 2015; Lidgard &amp; Love 2018).