Denoting a non-mobile organism. Related Articles: Monster nautiluses of the PalaeozoicAmmonite warsI, a Geologist (Part 2): The geology of Charles DarwinFurther rummages through the cephalopods (Part 2): Ammonites (and others) from around the worldCan the end-Permian mass extinction be attributed to a single, catastrophic event?« Back to Glossary Index