Ancient Survivors Moved Deeper

Modern descendants of once‑shallow, warm‑water cephalopods (nautiloids) have shifted to deeper, colder habitats and show morphological and behavioral changes (thicker shells, chemoreception‑led foraging). This shift appears tied both to long‑term climate cooling since the Cretaceous/Miocene and to recent ecological rearrangements from fishing and predator declines. — Shows how climate history plus contemporary human pressures can reshape the niche and abundance of 'living fossil' species, informing conservation priorities and how we interpret remnant lineages.