Dr. Lemanis and Dr. Igor Zlotnikov used linear and nonlinear mechanical simulations to demonstrate that the increase in the complexity of the shell’s geometry leads to an increase in the shell’s ...

Tracking the geometry of all 597 ammonoid genera from the Lower Devonian into the Lower Triassic, a 145-Myr period that spans three mass extinctions, shows that Paleozoic ammonoid shell geometries ...